in what state is it legal for uncle and niece to marry?

no state is it legal to marry ur niece .u need mental help

They can legally marry in any state, but not to each other.

West Virginia

"In the United States, every state and the District of Columbia have some form of codified incest prohibition. However, individual statutes vary widely. Rhode Island repealed its criminal incest statute in 1989, Ohio only targets parental figures, and New Jersey does not apply any penalties when both parties are 18 years of age or older. Massachusetts issues a penalty of up to 20 years' imprisonment for those engaging in sexual activities with relatives closer than first cousins and Hawaii up to 5 years in jail for "sexual penetration" with certain blood relatives and in-laws.
In all states, close blood-relatives that fall under the incest statutes include father, mother, grandfather, grandmother, brother, sister, aunt, uncle, niece, nephew, and in some states, first cousins. Many states also apply incest laws to non-blood relations including stepparents, step-siblings, and in-laws."
Source and further information:
http://en.wikipedia.org/wiki/Laws_regarding_incest#United_States

no state that is f***** disgusting its f***** incest u sick sick b****** it is jst wrong to marry ur niece yhuu need to get a life

Canada permits marriage between Uncle and Niece. No restrictions.

The following states also allow marriage between Uncle and Niece:

Massachusetts
Maryland
South Carolina
Tennessee
Georgia
Alabama
Texas
Rhode Island

Well it's not anything I ever considered doing, but you might want to check the laws of Rhode Island. I would also suggest you consider premarital and genetic counseling as what you seem to be proposing runs counter to the norms of US marriages. Would you consider having a chicken bone poked though your nose too?

http://en.wikipedia.org/wiki/Laws_regarding_incest

http://www.harvardlawreview.org/issues/119/june06/note/inbred_obscurity.pdf

India, Pakistan, etc
Need tickets?

West Virginy?