Monroeville is the county seat of Monroe County, Alabama, United States. At the 2020 census its population was 5,951. Several notable writers …Monroeville is the county seat of Monroe County, Alabama, United States. At the 2020 census its population was 5,951. Several notable writers were born in Monroeville. Occupied for thousands of years by indigenous peoples, this area was ceded by the historic tribe to the U.S. government in the 1830s and the era of Indian Removal.