Yes, it is illegal to marry your first cousin in Iowa, as state law explicitly voids such unions.
Iowa Statute Breakdown
Iowa Code §595.19 declares marriages between first cousins void from the outset. This covers blood relatives like aunts/uncles/nieces/nephews too, but first cousins are distinctly listed in subsection 1(c). The ban applies regardless of age, fertility, or other factors—no exceptions exist.
Historical Context
Iowa’s marriage laws date to 1840 as a territory, initially targeting closer kin without cousin bans. The first-cousin prohibition was added later, solidified in modern §595.19 (last amended 1994). It reflects 19th-century concerns over genetic risks and social norms, persisting into 2026.
Penalties and Enforcement
Attempting a cousin marriage doesn’t trigger criminal charges—it’s civilly void, not punishable like bigamy (also void under §595.19(2)). County recorders reject applications upfront, citing prohibited degrees of consanguinity. Post-ceremony, courts declare it invalid; no cohabitation legitimizes it.
Genetic and Health Concerns
First-cousin unions raise offspring risks: 4-7% chance of recessive disorders vs. 3% general population. Iowa’s ban aligns with states prioritizing public health, though critics argue modern testing mitigates risks. No data shows elevated issues in legal-cousin states, but Iowa upholds tradition.
Out-of-State Marriages
Iowa voids in-state cousin marriages but recognition of out-of-state ones is unclear—likely case-by-case under comity principles. Residents marrying cousins elsewhere (e.g., legal states like California) may face scrutiny for benefits/rights. Full Faith and Credit Clause doesn’t mandate recognition of void-per-law unions.
| Aspect | Iowa Rule | Example Legal State (CA) |
|---|---|---|
| First Cousins | Prohibited, void | Allowed |
| Cousins Once Removed | Allowed | Allowed |
| Criminal Penalty | None | None |
| Exceptions | None | None |
US State Comparisons
25 states ban first-cousin marriage outright (e.g., Iowa, Texas); 18 allow it (e.g., New York). Restricted states like Utah require age 65+ or infertility proof. Iowa joins stricter group like Kansas, no loopholes.
Alternatives and Distant Relatives
Second cousins or first cousins once removed (parent’s first cousin) can marry freely. Half-siblings prohibited as siblings. Adoption doesn’t alter blood relation bans.
Cultural and Modern Views
Cousin marriage common globally (10% worldwide), but rare in US (0.2%). Iowa’s law draws from religious/moral roots, challenged as unconstitutional for infringing privacy (no successful suits). Public opinion favors bans in Midwest.
Practical Advice
Check county clerk pre-application; blood tests unnecessary since 2018. For close relations, consult attorney—void marriage risks inheritance/divorce issues. Same-sex marriage legal since 2009 (Varnum v. Brien), but consanguinity overrides.
SOURCES:
- https://www.iowabar.org/?pg=MarriageAndDivorce
- https://law.justia.com/codes/iowa/title-xv/chapter-595/section-595-19/
