Survey township
In the American Public Land Survey System, a township refers to a unit of land, that is nominally six miles (9.7 km) on a side, usually containing 36 sections. The townships are referenced by a numbering system that locates the township in relation to a meridian (north-south) and base line (east-west).
Each 36 square mile (93 km²) township is divided into 36 one-square mile (2.6 km²) sections, that can be further subdivided for sale.
Survey townships (sometimes referred to as Congressional townships) are distinct from civil townships. A survey township is used to establish boundaries for land ownership. A civil township is a form of local government. In states that use both forms, civil townships generally use the boundaries established by survey townships.