ZIP 49078
Otsego city is only a small core of 49078. Most of the ZIP is Otsego Township, where mill-era streets give way to farms, ranch homes and newer lots along M-89, plus about a fifth of Watson Township to the north and a slice of Trowbridge to the west. South of the county line, part of Alamo Township, where Otsego's Alamo Elementary stands, shares the ZIP, as does a small corner of Van Buren County.