DNA Testing Castro Valley, CA
DNA Testing Castro Valley, CA
Paternity | Immigration | Family Relationship |
To Schedule A DNA Test At A Castro Valley, CA Location, Please Call (800)221-4291. The Process Is Fast, Easy & Confidential! Get The Answers You Need!
Accredited Drug Testing Inc (ADT) provides DNA testing at local testing centers in Castro Valley, CA and surrounding areas. Our Castro Valley, CA DNA Testing Centers use certified DNA collection specialists and Nationally Accredited AABB Laboratories for all DNA testing which will ensure the highest accuracy for DNA test results. DNA Testing Centers in the Castro Valley, CA area are located within minutes of your home or office.
20400 Lake Chabot Rd Ste 101, 0.2 miles
Castro Valley, CA 94546
24326 MISSION BLVD STE 3 2.1 miles
HAYWARD, CA 94544
13939 E 14TH ST 3.3 miles
SAN LEANDRO, CA 94578
27200 CALAROGA AVE 4.2 miles
HAYWARD, CA 94545
26250 INDUSTRIAL BLVD STE 32 4.4 miles
HAYWARD, CA 94545
2587 MERCED ST 4.5 miles
SAN LEANDRO, CA 94577
29000 HESPERIAN BLVD 5.4 miles
HAYWARD, CA 94545
1555 DOOLITTLE DR STE 180 5.5 miles
SAN LEANDRO, CA 94577
3555 WHIPPLE RD 6.1 miles
UNION CITY, CA 94587
7901 OAKPORT ST STE 4950 2ND FLOOR 7.0 miles
OAKLAND, CA 94621
7817 OAKPORT ST 7.1 miles
OAKLAND, CA 94621
401 ROLAND WAY STE 205 7.3 miles
OAKLAND, CA 94621
33077 ALVARADO NILES RD 7.4 miles
UNION CITY, CA 94587
33560 ALVARADO NILES RD 7.6 miles
UNION CITY, CA 94587
7667 AMADOR VALLEY BLVD 8.4 miles
DUBLIN, CA 94568
5720 Stoneridge Mall Road, Suite 110 8.5 miles
Pleasanton, CA 94588
2301 CAMINO RAMON STE 108 8.7 miles
SAN RAMON, CA 94583
7601 STONERIDGE DR FL 1 8.8 miles
PLEASANTON, CA 94588
6001 NORRIS CANYON RD Ste 142 8.9 miles
SAN RAMON, CA 94583
5601 NORRIS CANYON RD STE 140 8.9 miles
SAN RAMON, CA 94583
2421 ENCINAL AVE STE A 9.8 miles
ALAMEDA, CA 94501
4847 HOPYARD RD STE 4-424 10.0 miles
PLEASANTON, CA 94588
2111 Whitehall Place, Suite D 10.2 miles
Alameda, CA 94501
35500 DUMBARTON CT 10.3 miles
NEWARK, CA 94560
5635 W LAS POSITAS BLVD 10.7 miles
PLEASANTON, CA 94588
556 Mowry Avenue, Suite 103 10.8 miles
Fremont, CA 94536
2000 MOWRY AVE 11.0 miles
FREMONT, CA 94538
2147 MOWRY AVE STE C1 11.0 miles
FREMONT, CA 94538
3128 SANTA RITA RD 11.4 miles
PLEASANTON, CA 94566
3161 WALNUT AVE 11.5 miles
FREMONT, CA 94538
2324 SANTA RITA RD STE 4 11.5 miles
PLEASANTON, CA 94566
2224 DELUCCHI DR 11.7 miles
PLEASANTON, CA 94588
4000 DUBLIN BLVD STE 150 11.9 miles
DUBLIN, CA 94568
39180 FARWELL DR STE 231 12.2 miles
FREMONT, CA 94538
3200 BUSCH RD 12.3 miles
PLEASANTON, CA 94566
1517 GRAND AVE 12.4 miles
PIEDMONT, CA 94611
384 EMBARCADERO W 12.4 miles
OAKLAND, CA 94607
1700 BROADWAY STE 310 12.7 miles
OAKLAND, CA 94612
4069 PIEDMONT AVE STE 910 12.9 miles
OAKLAND, CA 94611
3300 WEBSTER ST, STE 1110 13.0 miles
OAKLAND, CA 94609
350 HAWTHORNE AVE 13.0 miles
OAKLAND, CA 94609
5763 STEVENSON BLVD 13.0 miles
NEWARK, CA 94560
3701 BROADWAY FL 5 13.0 miles
OAKLAND, CA 94611
1098 FOSTER CITY BLVD, STE 102 13.5 miles
FOSTER CITY, CA 94404
42650 CHRISTY ST 13.8 miles
FREMONT, CA 94538
1425 S MAIN ST 13.8 miles
WALNUT CREEK, CA 94596
3225 SELDON CT 14.3 miles
FREMONT, CA 94539
2450 ASHBY AVE 14.6 miles
BERKELEY, CA 94705
2 TERMINAL 14.7 miles
SAN FRANCISCO, CA 94128
1981 N BROADWAY Ste 190 14.7 miles
WALNUT CREEK, CA 94596
60 N EL CAMINO REAL 15.0 miles
SAN MATEO, CA 94401
39400 Padeo Padre Pkwy Mission Bldg 15.1 miles
Fremont, CA 94538
6001 SHELLMOUND ST STE 850 15.1 miles
EMERYVILLE, CA 94608
108 LA CASA VIA, STE 105 15.2 miles
WALNUT CREEK, CA 94598
125 SHOREWAY RD STE A 15.4 miles
SAN CARLOS, CA 94070
2850 7TH ST STE 100 15.8 miles
BERKELEY, CA 94710
1400 VETERANS BLVD FL 1 15.9 miles
REDWOOD CITY, CA 94063
SFIA Terminal 2 16.2 miles
San Francisco, CA 94125
222 W 39TH AVE 16.2 miles
SAN MATEO, CA 94403
1100 Laurel Street, Suite F 16.3 miles
San Carlos, CA 94070
On-site only 16.4 miles
San Francisco, CA 94124
46305 WARM SPRINGS BLVD 16.4 miles
FREMONT, CA 94539
320 LENNON LN FL 2 16.5 miles
WALNUT CREEK, CA 94598
46690 MOHAVE DR 16.5 miles
FREMONT, CA 94539
46752 MISSION BLVD STE A 16.5 miles
FREMONT, CA 94539
1111 E STANLEY BLVD 16.7 miles
LIVERMORE, CA 94550
1133 E STANLEY BLVD Ste 151 16.7 miles
LIVERMORE, CA 94550
2505 BATAAN ST STE O 17.0 miles
OAKLAND, CA 94607
170 ALAMEDA DE LAS PULGAS 17.3 miles
REDWOOD CITY, CA 94062
1663 ROLLINS RD 17.4 miles
BURLINGAME, CA 94010
1860 EL CAMINO REAL STE 400 17.5 miles
BURLINGAME, CA 94010
609 GREGORY LN STE 100 17.6 miles
PLEASANT HILL, CA 94523
24 WILLIE MAYS PLZ 17.6 miles
SAN FRANCISCO, CA 94107
401 Gregory Ln, Ste 146 17.6 miles
Pleasant Hill, CA 94523
1501 TROUSDALE DR 17.6 miles
BURLINGAME, CA 94010
2 CONNECTICUT ST STE 1 17.7 miles
SAN FRANCISCO, CA 94107
3 S LINDEN AVE 18.0 miles
SOUTH SAN FRANCISCO, CA 94080
795 EL CAMINO REAL 18.0 miles
PALO ALTO, CA 94301
3000 LAS POSITAS RD 18.1 miles
LIVERMORE, CA 94551
49 DRUMM ST 18.3 miles
SAN FRANCISCO, CA 94111
26 CALIFORNIA ST 18.3 miles
SAN FRANCISCO, CA 94111
580 MARKET ST STE 100 18.4 miles
SAN FRANCISCO, CA 94104
300 PASTEUR DR 18.7 miles
PALO ALTO, CA 94304
3555 CESAR CHAVEZ 18.7 miles
SAN FRANCISCO, CA 94110
801 TRAEGER AVE Ste 212 18.9 miles
SAN BRUNO, CA 94066
845 JACKSON ST 19.0 miles
SAN FRANCISCO, CA 94133
International Terminal Level 3 A Side 19.1 miles
SAN FRANCISCO, CA 94128
Castro & Duboce St, South Tower Ste 160A 19.2 miles
SAN FRANCISCO, CA 94114
601 VAN NESS AVE Ste 2008 19.2 miles
SAN FRANCISCO, CA 94102
5167 CLAYTON RD STE H 19.2 miles
CONCORD, CA 94521
900 HYDE ST 19.2 miles
SAN FRANCISCO, CA 94109
2090 COMMERCE AVE 19.5 miles
CONCORD, CA 94520
2198 15th St, 19.6 miles
San Francisco, CA 94114
2280 DIAMOND BLVD STE 520 19.7 miles
CONCORD, CA 94520
2231 GALAXY CT 19.7 miles
CONCORD, CA 94520
5570 STOCKTON LOOP 19.8 miles
LIVERMORE, CA 94550
2477 PACHECO ST 20.0 miles
CONCORD, CA 94520
2425 East Street, Suite 6 20.1 miles
Concord, CA 94520
2540 EAST ST 20.2 miles
CONCORD, CA 94520
2201 Post St, 20.2 miles
San Francisco, CA 94115
2300 SUTTER ST STE 102 20.3 miles
SAN FRANCISCO, CA 94115
2290 W EL CAMINO REAL STE 4 20.5 miles
MOUNTAIN VIEW, CA 94040
1805 ARNOLD DR 20.6 miles
MARTINEZ, CA 94553
315 S ABBOTT AVE 20.8 miles
MILPITAS, CA 95035
700 E CALAVERAS BLVD 20.8 miles
MILPITAS, CA 95035
200 MUIR RD Hacienda Bldg, 1st Floor 20.9 miles
MARTINEZ, CA 94553
505 PARNASSUS AVE Ste 896 20.9 miles
SAN FRANCISCO, CA 94143
4749 SURREY LN 21.0 miles
EL SOBRANTE, CA 94803
827 ARNOLD DR STE 70 21.0 miles
MARTINEZ, CA 94553
1900 SULLIVAN AVE 21.1 miles
DALY CITY, CA 94015
3237 ALHAMBRA AVE STE 2 21.4 miles
MARTINEZ, CA 94553
3726 BARRETT AVE 21.5 miles
RICHMOND, CA 94805
120 BROADWAY STE 23 21.7 miles
RICHMOND, CA 94804
573 W EL CAMINO REAL 21.9 miles
MOUNTAIN VIEW, CA 94040
1195 E ARQUES AVE BLDG 1 22.2 miles
SUNNYVALE, CA 94085
1717 S MAIN ST 22.3 miles
MILPITAS, CA 95035
901 W EL CAMINO REAL 22.4 miles
SUNNYVALE, CA 94087
901 NEVIN AVE BLDG B FLOOR 1 22.5 miles
RICHMOND, CA 94801
2500 GRANT RD 22.5 miles
MOUNTAIN VIEW, CA 94040
2000 VALE RD 22.6 miles
SAN PABLO, CA 94806
2737 WALSH AVE 22.9 miles
SANTA CLARA, CA 95051
2425 CHURCH LN 23.0 miles
SAN PABLO, CA 94806
1910 N Capitol Ave 23.0 miles
San Jose, CA 95132
988 WALSH AVE 23.5 miles
SANTA CLARA, CA 95050
877 W Fremont Avenue, Ste H-2 23.7 miles
Sunnyvale, CA 94087
2970 HILLTOP MALL RD STE 203 23.7 miles
RICHMOND, CA 94806
3774 RAILROAD AVE STE C 23.9 miles
PITTSBURG, CA 94565
1001 PITTSBURG ANTIOCH HWY STE B 24.2 miles
PITTSBURG, CA 94565
1825 CIVIC CENTER DR STE 7 24.4 miles
SANTA CLARA, CA 95050
500 Alfred Nobel Drive, Suite 115 24.6 miles
Hercules, CA 94547
2339 BUCHANAN RD 24.8 miles
ANTIOCH, CA 94509
1251 CALIFORNIA AVE STE 600 25.0 miles
PITTSBURG, CA 94565
Accredited Drug Testing takes the stress, out of a stressful situation!
Important Information (Beware)
Some companies offering DNA Testing may sell cheap / INEXPENSIVE, in-home or laboratory DNA kits. Please be aware that these types of DNA testing products cannot be used in a court proceeding FOR paternity, immigration or family relationship determinations.
Accredited Drug Testing only utilizes certified DNA collection specialists at our Castro Valley, CA DNA Testing Centers and AABB certified laboratories for DNA Testing which the test results may be utilized in child custody, child support, paternity or any other legal proceeding.
Accredited Drug Testing provides DNA testing in all cities nationwide and in the event the parties for the DNA test are located in different cities, Accredited Drug Testing will coordinate and schedule all of the DNA tests to ensure that all parties are accommodated in a convenient manner. As an example, if the mother and child are in one city, but the alleged father is in another, we will contact all parties to schedule the DNA test at a convenient location and time and report the results back to the authorized parties.
Legal or NON-Legal DNA Tests
When scheduling a DNA test regardless of the purpose, Accredited Drug Testing recommends always utilizing a legal DNA test procedure for current or future use. A legal DNA test has very specific Chain of Custody test procedures which ensures that the DNA test results can be used in a legal proceeding. A non-legal DNA test will provide the results, but cannot be used in any type of legal matter. When conducting a legal DNA test all parties must present a valid form of identification, photographs will be taken of all parties, legal guardian documentation and or birth certificates of any minor children may be required. These procedures for a legal DNA test ensure that should the DNA test results be used in a legal proceeding, the chain of custody is carefully followed and no challenge to the results can be successfully made, that's why it's always best to schedule a legal DNA test.
Accredited Drug Testing Recognized For DNA Expertise
Recently, Accredited Drug Testing and our company President and CEO, James A. Greer was consulted by the National Enquirer magazine regarding the JonBenet Ramsey murder case. Mr.Greer's comments were included in both the September 12th, 2016 edition and the January 2nd, 2017 edition of the National Enquirer.
Please note - Accredited Drug Testing, Inc. only utilizes American Association of Blood Bank (AABB) certified laboratories for DNA relationship testing. The AABB accreditation is the highest national standard applied to DNA testing laboratories.
Any DNA test which is conducted by a non- AABB laboratory will not be accepted in a court of law. Home kits and other types of non- AABB DNA testing, while inexpensive/cheap, are not reliable and will not be permitted in a legal proceeding.
Accredited Drug Testing Inc, applies the highest standard to the entire DNA testing process, from the DNA specimen collection, to the chain of custody, the laboratory analysis and the confidential results reporting.
To schedule a DNA Test or for more information including fees, Please call (800) 221-4291
For more information on AABB accreditation - Click Here
DNA testing can be used for the following purposes
- Birth Certificate Modification
- Child Support
- Child Custody
- Adoption
- Wills/Insurance
- Immigration
DNA Paternity Testing
A DNA test for paternity purposes determines the biological father of a child. Every human inherits specific DNA from both biological parents, half from the mother and half from the father. A DNA test examines a child's DNA pattern with that of an alleged father to determine if the child and the alleged father have the same DNA. Results of a properly administered DNA test utilizing an AABB accredited laboratory are 99.9% accurate. While DNA paternity testing may be stressful for some parties involved, Accredited Drug Testing is committed to making the entire DNA paternity testing experience, professional, convenient, confidential and Stress-Free.
When administering a DNA test to a child/minor, the legal guardian must be present and provide authorization for the DNA test to be conducted. The legal guardian can be the mother, father or other natural or court ordered person who has legal decision making authority over the minor child.
DNA Immigration Testing
DNA testing can be used for reasons relating to immigration and the biological relationship between a petitioner and affiliated individual. DNA immigration testing can be used for paternity tests, Maternity tests, sibling relationship and other purposes required by the U.S Department of State. Accredited Drug Testing will coordinate the entire process, including scheduling the DNA test for parties located in the United States and forward the DNA collection kit to the U.S Embassy located in a foreign country where the other party is located. Once the DNA collection has occurred at one of our testing centers in the U.S and at the U.S Embassy where the other parties are located, Accredited Drug Testing will ensure that all specimens are sent to the lab for DNA testing and provide the results once the AABB laboratory has analyzed the DNA test.
What is a DNA test?
A DNA test is a procedure to determine if exact biological characteristics exist in one person's DNA and those exact same DNA characteristics in another person's DNA makeup. As humans each of us contains different DNA makeup however, parents and children have the same DNA, siblings from the same parents have the same DNA and grandparents have the same DNA as grandchildren. A DNA test is a non-intrusive procedure usually utilizing an oral swab from all parties, which then follows a specific chain of custody process in which the oral swab specimens are sent to a certified and accredited AABB laboratory. The Laboratory that analyzes the DNA specimen and provides the results. DNA test results are 99.9% accurate.
How to schedule a DNA Test?
It's simple, contact Accredited Drug Testing at (800)221-4291, and provide various information including the city you wish to take the DNA test, who will be taking the DNA test, mother, child and alleged father. When the parties are available to take the DNA test (Accredited Drug Testing will schedule the appointment with each available party). Once the results are received from the AABB laboratory Accredited Drug Testing will forward the results by email and U.S Mail (Hard Copy) to all authorized parties.
How long does it take for DNA test results?
Once all parties have completed the DNA test collection, the specimens are immediately sent to the certified AABB laboratory and results are usually available within 3-5 business days.
On-Site/Mobile DNA Testing
We come to you!, Accredited Drug Testing can provide on-site/mobile DNA testing at your home, office, hospital or other location. (Additional on-site fees may apply)
More DNA Testing FAQ
What is paternity?
Paternity means fatherhood. Paternity is established when a paternity testing laboratory uses genetic testing methods / DNA test, to demonstrate to a legal standard, that an alleged father is the biological father. Paternity is disproved when these same methods and standards demonstrate that an alleged father is not the biological father.
What is DNA testing?
DNA testing refers to the process of examining an individual's DNA markers for the purpose of genetic human identification and for determining the relationship between two people.
How accurate is DNA-Based paternity testing?
The DNA profiling method is an extremely accurate genetic testing method. It can absolutely determine if the man is not the biological father and reliably exclude him. DNA profiling can establish that the alleged father is the child's biological father with a probability of paternity of 99.99% or higher. Each year many individual clients, child support offices, attorneys, judges, and physicians choose Genetic Profiles as their source for information, guidance and testing services in order to determine paternity.
Are the results admissible in court?
Yes. The laboratory follows a strict chain-of-custody procedure which allows for court/legal admissibility.
Is the Lab accredited? Are the results reliable?
The DNA testing laboratory used by Genetic Profiles is accredited by the American Association of Blood Banks(AABB)for the purpose of performing paternity (parentage) tests. Your paternity test will be processed by highly skilled and trained laboratory technicians. Every test is evaluated by a Ph.D. scientist with several years specializing in DNA genetic testing.
How long does it take to receive results from the paternity test?
It typically takes about 3-4 working days to complete the testing. In cases where the mother's sample is not included or when an abnormal/difficult sample is used, testing may require more time.
Are the paternity test results confidential?
Yes, The DNA test results are strictly confidential. They are released only to the adult persons who were tested and, as requested, to their authorized agents (e.g. attorneys).
How does DNA paternity testing work?
DNA analysis, which has proven to be a major advance in the field of paternity testing, involves the direct examination of the genetic material that a child inherited from its biological parents. DNA is located throughout the human body and in the same identical form. Thus, DNA in blood is the same as that in skin, cheek lining, muscle, bone, teeth and various other tissues. The DNA of a person is fully established at conception and remains totally constant throughout life. During the paternity testing process, the genetic characteristics of the child are first compared to those of its mother. Those characteristics in the child that cannot be found in the mother have been inherited from the biological father. If the tested man (alleged father) does not have the genetic characteristics necessary to be the biological father of the child, he is excluded. If the tested man's DNA does contain those genetic characteristics, then the probability that this man is the true biological father is calculated and reported by the laboratory.
What are some of the reasons DNA testing is conducted?
There are many legal and personal reasons that require DNA testing. Some of the more common include:
- peace of mind
- family medical concerns
- child support
- custody
- adoption
- citizenship/immigration
- inheritance/benefits (social security, insurance, etc.)
- crime scene analysis (forensic testing)
Can I do anything to alter the results of the test?
No, you can not alter the results of a test. Medication, drugs, alcohol, food, age or lifestyle cannot alter the DNA pattern within an individual.
Handy Resources
Comprehensive Online Resources for Drug Testing
- National Institute on Drug Abuse (NIDA)
Provides comprehensive information on drug testing and its role in substance use disorder treatment.
- FDA: Drug Testing
Explains the FDA's role and regulations concerning drug testing for consumers.
- PDR.net
Provides detailed drug information and safety updates through a mobile-friendly platform.
- BeSafeRx - FDA
Resource by the FDA to help consumers identify and choose safe online pharmacies.
- SAMHSA: Drug Testing Resources for the Workplace
Resources and guidelines for drug testing in the workplace.
- Drugs.com
Provides drug information, side effects, and interactions for consumers and professionals.
- Drug Abuse Screening Test (DAST)
Online version of the DAST to help individuals assess whether they have a drug problem.
- Merck Manuals
Consumer-friendly medical resource providing comprehensive information on a wide array of health topics, including drug testing.
- SAMHSA Store
Provides access to resources and publications on substance use prevention and treatment.
- National Association of Boards of Pharmacy (NABP)
Information on state boards of pharmacy and regulations, including those related to drug testing.
- CDC: Workplace Health Promotion
CDC's resources on substance use and drug testing in the workplace.
- Mayo Clinic: Drug Testing
General information about the procedures and types of drug tests.
- MedlinePlus: Drug Testing
Offers information about various drug tests and their uses in medical diagnosis and treatment.
- University of Rochester Medical Center Health Encyclopedia
Provides a detailed entry on drug testing, including how tests are conducted and what they detect.
- World Health Organization (WHO)
International guidelines and information on public health, including substance abuse and drug testing.
- Healthline: Drug Testing
Consumer health site offering information on how drug tests work and what they look for.
- WebMD: Drug Testing
Provides a patient-oriented overview of drug testing and its purposes.
- National Center for Biotechnology Information (NCBI)
Provides a vast database of scientific studies, including research on drug testing and its effectiveness.
AI Overview
DNA Testing
DNA testing, also known as genetic testing, involves examining an individual's DNA to identify genetic differences or mutations that may be indicative of certain conditions or diseases. It is a powerful tool used in a variety of contexts, from medical diagnostics and forensic analysis to genealogy and ancestry exploration.
Types of DNA Tests
- Diagnostic Testing: Used to confirm or rule out a specific genetic disorder. It is often conducted when a particular condition is suspected based on physical symptoms.
- Carrier Testing: This type of test is useful for individuals who may carry a gene for a genetic disorder. It is particularly important for couples considering starting a family.
- Prenatal Testing: Performed during pregnancy to assess the health of a fetus. It can detect conditions like Down syndrome, cystic fibrosis, or other genetic disorders.
- Forensic Testing: Used in legal contexts to identify individuals in criminal cases or to settle disputes in paternity cases.
- Ancestry Testing: Provides insights into one's ethnic background and genealogical roots. This test can help individuals understand their family history and origins.
Applications of DNA Testing
- Medical Diagnosis: Helps in diagnosing genetic diseases and conditions, allowing for targeted treatment plans.
- Paternity and Family Relationship Analysis: Determines biological relationships between individuals, often used in custody cases and inheritance claims.
- Personalized Medicine: Assists in selecting the most effective therapies based on an individual’s genetic profile.
- Crime Solving: Aids law enforcement in identifying suspects or victims using genetic evidence.
Advantages of DNA Testing
DNA testing provides several benefits:
- Accurate Diagnosis: Enhances the accuracy of medical diagnoses and the efficacy of treatment strategies.
- Early Detection: Facilitates the early detection of predispositions to diseases, potentially leading to preventative measures or early interventions.
- Family Planning: Offers critical information for prospective parents concerning genetic disorders that could be passed on to offspring.
Limitations and Ethical Considerations
Despite its many applications, DNA testing raises important ethical and privacy concerns:
- Privacy Concerns: Handling and protection of genetic data is critical as it contains sensitive information about an individual’s health and predisposition to diseases.
- Potential for Discrimination: There is a risk of genetic discrimination by employers or insurers based on an individual’s genetic information.
- Emotional Impact: The results from DNA testing can have significant emotional implications for individuals and families, particularly when revealing unexpected or distressing information.
In conclusion, while DNA testing offers profound insights into genetics and has transformative potential across various fields, it must be approached with caution, respecting ethical standards and privacy laws to safeguard individuals’ rights and well-being.
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Local Area Info: Castro Valley, California
Castro Valley is a census-designated place (CDP) in Alameda County, California, United States. As of the 2010 census, it is the fifth most populous unincorporated area in California and the twenty-third most populous in the United States.[citation needed] The population was 61,388 at the 2010 census.
With the arrival of Europeans, Castro Valley was part of the land granted to Mission San Jose in 1797. The area Castro Valley now occupies was part of the extensive colony of New Spain in what was the state of Alta California.
Castro Valley was part of the original 28,000 acre (110 km²) land grant given to Castro in 1840, called Rancho San Lorenzo. This land grant included Hayward, San Lorenzo, and Castro Valley, including Crow Canyon, Cull Canyon, and Palomares Canyons. Castro had a gambling habit and had to sell off portions of his land to pay gambling debts. The last of his holding was sold in a sheriff's sale in 1864 to Faxon Atherton for $400,000.