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is a city in Oakland County in the U.S. state of Michigan. The population was 10,036 at the 2000 census. The city is part of the South Lyon-Howell-Brighton Urban Area, which had a population of 106,139 according to the 2000 census. South Lyon is located in the far southwest corner of Oakland County and shares a border with both Livingston and Washtenaw Counties.
According to the United States Census Bureau, the city has a total area of 3.4 square miles (8.8 km²), all land. The city has grown in size over the years through a series of annexations of land from neighboring Lyon Township. These annexations have created several Township islands on the Livingston County border separated from the rest of the Township by the City. The City and Township recently approved a land exchange to release a portion of the city back to the Township.