No, it is not illegal to marry your first cousin in California. The state’s Family Code explicitly allows cousin marriages without restrictions, treating them the same as other unions.
Legal Basis
California’s marriage laws, outlined in the Family Code (e.g., Sections 2200 and related provisions), prohibit unions only between immediate family members like parents, children, siblings, grandparents, and grandchildren. First cousins, second cousins, and more distant relatives are not listed among prohibited relationships, making such marriages fully legal and valid.
This permissive stance reflects California’s emphasis on individual rights and cultural diversity, distinguishing it from stricter states. No special permits, genetic testing, or age/infertility waivers are required beyond standard marriage rules.
Marriage Process
To marry your cousin in California, follow the same steps as any couple. Apply for a marriage license at a county clerk’s office with valid ID, proof of age (both must be 18+ or meet emancipation rules), and payment of fees (typically $35–$100, varying by county).
An authorized officiant performs the ceremony within 90 days, and the signed license is filed to record the marriage. Cousin status does not trigger additional scrutiny.​
State Comparisons
California is one of about 17–19 states (sources vary slightly) permitting unrestricted first-cousin marriage. Others impose conditions like age 65+ or infertility proof (e.g., Arizona, Utah), while 25+ states ban it outright.
| Category | States | Examples |
|---|---|---|
| Unrestricted | ~17–19 | California, New York, Florida |
| Restricted | ~7–10 | Arizona (65+ or infertile), Nevada (50+ for uncle-niece) |
| Banned | ~25–32 | Texas, Kentucky, Nevada (for cousins in some cases) |
Interstate recognition varies; California honors out-of-state cousin marriages, but others may not.​
Genetic and Health Considerations
While legal, first-cousin marriages carry a modestly elevated risk of genetic disorders in offspring (2–3% above the general 3–4% baseline, per studies). Risks rise with family history of recessive conditions.
Experts recommend genetic counseling from services like those via the National Society of Genetic Counselors. This assesses carrier status without legal mandate in California.​
Cultural and Historical Context
Cousin marriages are common globally (e.g., 10%+ in parts of the Middle East, South Asia) and historically in the U.S., including among early settlers. California’s diverse population supports this practice without stigma in law.
Social views differ; while accepted in some immigrant communities, broader U.S. culture often views it as taboo, influencing rarity (under 0.2% of marriages).​
Rights and Implications
Cousin marriages grant full spousal rights: inheritance, taxes, benefits, divorce proceedings. No discrimination exists under state or federal law.
For immigration, USCIS recognizes them equally. Wills or custody disputes treat them as standard marriages.​
Recent Updates (as of 2026)
No changes to California’s cousin marriage laws occurred in 2025; it remains unrestricted. Monitor Family Code via leginfo.legislature.ca.gov for amendments.
Couples should consult attorneys for personalized advice, especially with interstate moves or complex estates.
SOURCES:
- https://www.worldlawdigest.com/usa/general/is-it-legal-to-marry-your-cousin-in-california
- https://rivercityomaha.com/2025/01/is-it-illegal-to-marry-your-cousin-in-california-heres-what-the-law-says/
