Richmond is a city on the border between Macomb and St. Clair counties in the U.S. state of Michigan. The population was 4,897 at the 2000 census. The 2008 Census Bureau Estimate places the population at 5,606. Most of the city is located in Macomb County, though there is a small portion in St. Clair County. The city is adjacent to Richmond Township and Lenox Township in Macomb County, although it is administratively autonomous. It is also adjacent to St. Clair County's Columbus Township and Casco Township.