Lapeer County is a county located in the U.S. state of Michigan. As of the 2020 Census, the population was 88,619. The county seat is Lapeer. The county was created on September 18, 1822, and was fully organized on February 2, 1835. The name is a corruption of the French la pierre, which means "the stone". Lapeer County is located north of Detroit and east of Flint.

Lapeer is a city in the U.S. state of Michigan and is the county seat of Lapeer County. As of the 2020 census, the city population was 9,023. Most of the city was incorporated from land that was formerly in Lapeer Township, though portions were also annexed from Mayfield Township and Elba Township. Lapeer is in southern Michigan, east of Flint, on the Flint River.