Census & Census Substitute Indexes The entries are listed by locale, the by date. If an index spans a range of years, it’s placed according to the earliest year. All Indexes Contact Atlas of Arenac County, Patron’s Reference Directory [1906] (updated 03/16/2008) Part of the “1906 Standard Atlas of Arenac County, Michigan,” includes name and occupation.Census of Au Gres [City] 1870 (updated 02/21/2014)Deep River Township Arenac County T19N-R4E, 1938 WPA (indexed 8/19/2026) LedgerFarm Statistics, Mason Township [1899] (updated 06/19/2008)