[1] Newcomb is coterminous with Congressional township 21 North, Range 7 East of the Third Principal Meridian.

The historically registered Hazen Bridge crosses the Sangamon River in the eastern part of this township.

12.30% of all households were made up of individuals, and 4.80% had someone living alone who was 65 years of age or older.

Though the township is mostly farmland, it also contains the Manlove Field Natural gas storage area operated by Peoples Gas Light & Coke Company.

(40°14′33″N 088°25′17″W / 40.24250°N 88.42139°W / 40.24250; -88.42139) The storage facility is an underground aquifer opened in 1966 capable of storing around 150 billion cubic feet (4.2×109 m3)[1] of natural gas for delivery to the Chicago area via connected pipelines.

An early post office in northwest Condit Township, near Fisher, was called Newcomb.