Natchez (/ˈnætʃɪz/ NATCH-iz) is the county seat of and only city in Adams County, Mississippi, United States. Natchez has a total population of 14,520 (as of the 2020 census). Located on the Mississippi River across from Vidalia in Concordia Parish, Louisiana, Natchez was a prominent city in the antebellum years, a center of cotton planters and Mississippi River trade.