Most Inbred States 2025

First-Cousin Marriages Void

Yes

Unknown

State	First-Cousin Marriages Allowed↓	First-Cousin Marriages Void	First-Cousin Sexual Relations or Cohabitation Allowed
Alabama	Yes	No	Yes
Alaska	Yes	No	Yes
California	Yes	No	Yes
Colorado	Yes	No	Yes
District of Columbia	Yes	No	Yes
Florida	Yes	No	Yes
Georgia	Yes	No	Yes
Hawaii	Yes	No	Yes
Maryland	Yes	No	Yes
Massachusetts	Yes	No	Yes
New Jersey	Yes	No	Yes
New Mexico	Yes	No	Yes
New York	Yes	No	Yes
Rhode Island	Yes	No	Yes
South Carolina	Yes	No	Yes
Tennessee	Yes	Yes	Yes
Vermont	Yes	No	Yes
Virginia	Yes	No	Yes
Maine	Proof of genetic counseling from a genetic counselor required.	No	Yes
Wisconsin	Only if the woman is at least 55 or either is permanently sterile.	No	No
Indiana	Only if both parties are 65 or older.	Yes	Yes
Arizona	Only if both parties are 65 or older or one is infertile.	Yes	No
Utah	Only if both parties are 65 or older or both are 55 or older with a district court finding of infertility of either party.	Yes	No
Illinois	Only if both parties are 50 or older, or if one of the parties is infertile.	No	Yes
Minnesota	Only certain types.	Yes	Yes
Arkansas	No	Yes	Yes
Delaware	No	Yes	Yes
Idaho	No	Unknown	Yes
Iowa	No	Yes	Yes
Kansas	No	Yes	Yes
Kentucky	No	Yes	No
Louisiana	No	Yes	Yes
Michigan	No	Yes	Yes
Mississippi	No	Yes	No
Missouri	No	Yes	Yes
Montana	No	Yes	Yes
Nebraska	No	Yes	Yes
Nevada	No	Yes	No
New Hampshire	No	Yes	Yes
North Dakota	No	Yes	No
Ohio	No	No	Yes
Oklahoma	No	Yes	Yes
Oregon	No	Yes	Yes
Pennsylvania	No	Yes	Yes
South Dakota	No	Yes	No
Texas	No	No	No
Washington	No	Yes	Yes
West Virginia	No	Unknown	Yes
Wyoming	No	Yes	Yes

Although largely settled, marriage laws may change at any time. Data shown should not be considered legally authoritative. Interested parties are encouraged to confirm legalities with local authorities.
The existence of laws supporting or discouraging inbreeding do not necessarily correspond exactly to the prevalence of inbreeding.

Inbreeding is the production of offspring from the mating of individuals who are closely related. Inbreeding is taboo worldwide due to the high potential for sexual abuse, especially child abuse, and lasting trauma. Additionally, the chances of inheriting genetic disease significantly increase among children who are the result of inbreeding.

Researchers from the University of Queensland observed 450,000 genomes from people of European descent born between 1938 and 1967. Out of the group, 125 people met the inbreeding criteria, meaning the parents were either first-degree relatives (siblings) or second-degree relatives (aunts, uncles, etc.). In this group, researchers found common health issues such as decreased cognitive abilities and muscular function, reduced height and lung function, and a greater risk of contracting diseases in general.

While inbreeding is incredibly taboo in the United States, it is somewhat legal in some states. While not widely practiced, first-cousin marriage is legal in 19 states, and some first-cousin marriages are legal in six states. Sexual relations and cohabitation are only prohibited in nine states. Approximately 0.2% of all marriages in the United States are between second cousins or closer. That means that there are about 250,000 Americans that are in these relationships.

Inbreeding is more common in the following states (in alphabetical order): Alabama, Arkansas, Delaware, Georgia, Indiana, Kentucky, Louisiana, Maine, Maryland, Montana, New Mexico, North Carolina, Oklahoma, Oregon, South Carolina, South Dakota, Tennessee, Virginia, Washington, and West Virginia. Generally, inbreeding is more common in the southeast region of the U.S. and more rural states. Approximately 70% of inbred families live in desolate areas.

Inbreeding is common, specifically, in the eastern part of Kentucky, and the region is plagued by the stereotype that every family is an inbred family. While the stereotype is not entirely true, inbreeding rates are higher in eastern Kentucky than in any other part of the state. It is believed that this is partially because people have moved to the mountains in eastern Kentucky for the low cost of living and the lifestyle. Still, there are typically no other families living in these locations. The families that move there either don’t have the money to leave or do not want to leave, and the growing children typically inbreed to save their family name.

One family from Kentucky known for generations of inbreeding is the Fugate family. The Fugate family was relatively isolated from the rest of society for nearly 200 years. Their inbreeding led to several medical problems and recessive genes being passed down through each child, such as one that gave some of the offspring blue skin. The blue skin gene is a recessive gene that only appears when both parents are carriers of the gene. The inbreeding caused the recessive gene to appear in both parents.

Most Inbred States 2025

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