Salt River Township covers an area of . It contains part of one incorporated city,
Mexico (the county seat). Unincorporated places include
Champ, Francis (railroad station; formerly Felton), Molino (former post office), Ortiz (railroad station; formerly Doan, and also known as Ortiz Station), Salt River (former post office), and Young's Creek (former post office). The streams of
Brushy Branch,
Fish Branch,
Fivemile Creek, Little Skull Lick Creek, Middle Lick Creek and
Skull Lick Creek run through this township. There are four cemeteries in the township: Elmwood, Mount Zion, Saint Brendans and Trinity. ==References==