Wyoming was formed from Genesee County in 1841. Eagle, Pike and a part of Portage were annexed from Allegany Co. in 1846.
- US Atlas 1895 - Wyoming County
- County seat:
- Arcade, Attica, Bennington, Castile, Covington, Eagle, Gainsville, Genesee Falls, Java, Middlebury, Orangeville, Perry, Pike, Sheldon, Warsaw, Wethersfield.