Lancaster
- County:
- Grant County
- County Seat:
- Yes
- Area (mi²):
- 3.008
- State:
- Wisconsin
Lancaster is a city located in Grant County, Wisconsin. Lancaster has a 2026 population of 4,042. It is also the county seat of Grant County. Lancaster is currently growing at a rate of 0.3% annually and its population has increased by 2.67% since the most recent census, which recorded a population of 3,937 in 2020.
The median household income in Lancaster is $84,302 with a poverty rate of 6.45%. The median age in Lancaster is 45.1 years: 47.2 years for males, and 44.8 years for females. For every 100 females there are 94.3 males.