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is a city in and the county seat of Grant County, Wisconsin, United States. As of the 2000 census, the population was 4,070.
Major G.M. Price, a land speculator, laid out the town in 1837. He was persuaded to name it Lancaster by a relative who migrated from Lancaster, Pennsylvania. At Pleasant Ridge, one of the first African-American communities in Wisconsin was founded by the Shepard family in 1849 and settled in the 1850s. Lancaster was the home of the first governor of Wisconsin, Nelson Dewey.