Founded in the year of 1873, Sully County is located in the U.S state of South Dakota. It has derived its name from Alfred Sully. Covering an extensive area of 1,070 sq mi, it houses more than 0.6K households and 0.4K family units with more than 1K people with a racial makeup including of White, Pacific Islander, African American, Asian, Native American, Hispanic or Latino of any race, and other races living in this county. Onida is the county seat and the largest city.

Sully County records website delivers essential facts and figures regarding ancestry and genealogical characteristics with its exclusive features and vast eccentricity. Infinite clues with prolific hints encourage the supply of information on last will or probate specifics, demise facts, census data, land and estate data, war and enlistment data, origin and birth details, marriage volume number, marriage and divorce details, immigration and naturalization specifics, obituary notice, burial and cemetery details, World War I and II information, civil court case lookups, American Civil War history, real estate and property facts and the likes that together endorse the extensive online research activities.