The largest municipality in population is Oftringen, the smallest is Wiliberg.

[1] Bezirk Zofingen has an area, as of 2009[update], of 141.97 square kilometers (54.81 sq mi).

Of the rest of the land, 23.43 km2 (9.05 sq mi) or 16.5% is settled (buildings or roads).

[2] Zofingen district has a population (as of December 2020[update]) of 73,843.

[4] From the 2000 census[update], 15,245 or 26.2% were Roman Catholic, while 31,061 or 53.3% belonged to the Swiss Reformed Church.