Saline is a city in Washtenaw County in the U.S. state of Michigan. The population was 8,948 at the 2020 census. The city borders Saline To…Saline is a city in Washtenaw County in the U.S. state of Michigan. The population was 8,948 at the 2020 census. The city borders Saline Township to the southwest, and the two are administered autonomously.