Page 379 of Walter Romig's Michigan Place Names says:
"Mooreville, Washtenaw County:
the village is named for its founder, John L. Moore, who came from New York and settled here by the Saline River about 1830 and was appointed the first postmaster on Jan. 5, 1833. The post office was renamed York, after its township, from May 2, 1834, until it was closed on April 30, 1907, but the hamlet of Mooreville (in some records as Mooresville) remains. [Chapman; PO Archives]."
Mooreville is located about three miles west of Milan. When the railroads decided to go through Milan instead of Mooreville, the community of Mooreville declined. Many of the buildings in Mooreville were then moved to Milan.