Kansas has a land area of 81,758.5 square miles and a water area of 519.7 square miles. It is the 13th largest state by area.

Allen County, Kansas has 500.3 square miles of land area and is the 97th largest county in Kansas by total area.

Anderson County, Kansas has 579.6 square miles of land area and is the 86th largest county in Kansas by total area.

Atchison County, Kansas has 431.2 square miles of land area and is the 102nd largest county in Kansas by total area.

Barber County, Kansas has 1,134.1 square miles of land area and is the 6th largest county in Kansas by total area.

Barton County, Kansas has 895.3 square miles of land area and is the 29th largest county in Kansas by total area.

Bourbon County, Kansas has 635.5 square miles of land area and is the 79th largest county in Kansas by total area.

Brown County, Kansas has 570.9 square miles of land area and is the 92nd largest county in Kansas by total area.

Butler County, Kansas has 1,429.7 square miles of land area and is the 1st largest county in Kansas by total area.

Chase County, Kansas has 773.1 square miles of land area and is the 50th largest county in Kansas by total area.