Jimerson Town (also spelled Jimersontown and given the Seneca language name tsyo:nya:tih) is a native planned community on the Allegany Indian Reservation within the bounds of Cattaraugus County, New York. Along with Irving on the Cattaraugus Reservation, Jimerson Town is one of two capitals of the Seneca Nation of Indians.
The United States Census Bureau does not recognize the community and no population estimates are available. At the time of its founding in the 1960s, the community was developed with 145 residences, each on one-acre plots. It has been developed with several facilities since the 1980s.