|  Photo from Digital-Topo-Maps.com | Three Rivers, MI 49093 Post Office Location: 100 North Main Street; Three Rivers, MI Year Post Office built: Town(s) Served: Three Rivers Acceptable City Names: Three Rivers Not Acceptable City Names: Sectional Service Facility: Kalamazoo (Central) County(ies): Cass, St. Joseph Info on Three Rivers: The City of Three Rivers is located in St. Joseph County. It gets it's name from the St. Joseph, Rocky, and Portage Rivers. | 
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