No special conditions.
One generation apart, half the shared DNA of first cousins.
Allowed in New York and every other US state.
Neighboring states.
Cousin marriage laws change at the state line. Here's how New York's neighbors handle first cousins.
| State | First cousins | Details |
|---|---|---|
| Vermont | Legal | |
| Massachusetts | Legal | |
| Connecticut | Banned | Banned for new marriages from October 1, 2025. Earlier marriages stay valid. |
| New Jersey | Legal | |
| Pennsylvania | Banned |
See all 50 states on the cousin marriage map. Laws change, so confirm with your county clerk before you plan anything.
Legal is one question. Genetics is another.
Children of first cousins have roughly a 5 to 6% chance of a serious birth defect, compared with about 3% for unrelated parents. For second cousins, the extra risk is under one percentage point.
The risk comes from recessive conditions. Cousins are more likely to carry the same hidden variant from a shared grandparent. A carrier screen tells you whether you two actually do. If you don't, most of the extra risk goes away.
Not sure exactly how you're related? The cousin calculator names any relationship, and a DNA comparison settles it for good.
Cousins? Check your carriers.
The single most useful test a related couple can take before kids. One couple result, with a genetic counselor included.
New York cousin questions.
Can you marry your first cousin in New York?
Yes. New York allows first cousins to marry with no special conditions.
Can you marry your second cousin in New York?
Yes. Second cousins can legally marry in New York, as in every US state.
Can you marry your first cousin once removed in New York?
Yes. If first cousins can marry in New York, so can first cousins once removed.
Is it legal to date your cousin in New York?
Dating isn't regulated, but marriage and incest laws can apply to close relatives. In New York, first cousins can legally marry. Second cousins and beyond are fine.