Page 540 of Walter Romig's Michigan Place Names says:
Stony Creek, Washtenaw County:
Andrew Muir was the first [European] settler in the area, now Augusta Township; the village was founded by James Miller who came in 1829; the first post office in the township was opened at Paint Creek (q.v.); the first post office named Stony Creek was opened on July 7, 1862, with Calvin H. Stone as its first postmaster, the office operating until July 15, 1905 [Chapman; Beakes; PO Archives]".
Stony Creek is located north-east of Milan. There is an church with a cemetery behind it and an old granger hall still existing.
Page 426 of Walter Romig's Michigan Place Names says:
Paint Creek, Washtenaw County:
the first post office in present Augusta Township was located at Wejinigan-sibi, or Paint Creek, which runs through the township; the office was opened on Jan. 15, 1837, with David Hardy as its first postmaster, but was transferred to Newcomb on Sept. 27, 1881 [Chapman; Beekes; PO Archives]."