There is also a Middleton in Clinton County so hopefully my old postcard photos are correct. There are also 2 Middletowns in Michigan.
From Michigan Place Names
Gratiot County: founded by George Middleton in 1885. Given a station on the Toledo, Saginaw & Muskegon (now Grand Trunk) Railroad in 1886. Michael S. Howell became its first postmaster on Nov. 26, 1887; the village was first platted by Mr. Howell, George Flanks, John B. Resseguie, and George S. and William T. Naldrett, and recorded in 1887 [Tucker; PO Archives]