Nauvoo Historic District is a National Historic Landmark District containing the city of Nauvoo, Illinois. The historic district is nearly coterminous with the City of Nauvoo as it was incorporated in 1840, but it also includes the Pioneer Saints Cemetery (40°32′13″N 91°21′03″W﻿ / ﻿40.5369°N 91.3507°W﻿ / 40.5369; -91.3507﻿ (Old Nauvoo Burial Grounds)), the oldest Mormon cemetery in the area, which is outside the town boundary.[1]