 A post office was established at Collamer in 1849, and remained in operation until it was discontinued in 1922.A structure similar in stature to the Stockdale Mill near Roann, Indiana, the four-story Collamer Grist Mill was built in 1845 by (Elias) Miller and Harder the summer before the official platting of the town.The mill first ground corn, then wheat and other small grains.