|  Photo from Digital-Topo-Maps.com | Three Oaks, MI 49128 Post Office Location: 201 North Elm Street; Three Oaks, MI Year Post Office built: Town(s) Served: Three Oaks Acceptable City Names: Three Oaks Not Acceptable City Names: Sectional Service Facility:Kalamazoo (Southwest) County(ies): Berrien Info on Three Oaks: The Village of Three Oaks is located in South Central Berrien County. It sits along U.S. 12. It was settled in 1850, and incorporated in 1867. This was originally called Chamberlin's Siding. The name was changed to because of three oak trees that railroad workers used as a marker. | 
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