sentences:  In the case of the latter two years, it is likely their incorporation charter lapsed and was not renewed until prior to its reappearance on the 1960 U.S. Census.As of the census of 2000, there were 2,539 people in 1,033 households, including 729 families, in the city.The population density was 287.6 people per square mile (111.0/km²).