As of the 2020 census, the township's population was recorded at 11,715 (up from 11,047 at 2010[3]), with a total of 5,107 housing units within its boundaries.

Based on data from the 2010 census, Columbia Township encompasses a total area of 36.73 square miles (95.1 km2).

Within this expanse, 36.71 square miles (95.1 km2), equivalent to 99.95% of the total area, constitutes land, while a minor portion of 0.02 square miles (0.052 km2), equivalent to 0.05%, consists of water bodies.

[citation needed] (This list is based on USGS data and may include former settlements.)

The township contains fourteen cemeteries: Brown, Compton/Oak Grove, County Home, Eberhard, Greenhill, Hell’s Half Acre, Nolt(Beaver Reserve), Potter’s Field, Ream(Bethel), Saint Peter, Shoemaker, South Park, South Park Annex and Spooktown.