|  Photo from Digital-Topo-Maps.com | Plainwell MI 49080 Post Office Location: 457 East Bridge Street; Plainwell, MI Year Post Office built: Town(s) Served: Plainwell Acceptable City Names: Plainwell Not Acceptable City Names: Sectional Service Facility:Kalamazoo (Central) County(ies): Allegan, Barry, Kalamazoo Info on Plainwell: The City of Plainwell was settled along an old stagecoach trail between Kalamazoo and Grand Rapids. It is home to 3,804 residents (2010 census). Plainwell is located in Southeastern Allegan County. | 
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