The largest county is Allen (657sq. mi., 1,702 km²)
Marion County is the largest county in Indiana with an estimated population of 903,393 as of the 2010 U.S. Census. Allen County is the largest county in Indiana with total land area of 657 square miles.
Clark County, Indiana covers approximately 375 square miles in total.
The largest county in square miles in Kansas is Sedgwick County, with an area of approximately 998 square miles.
The largest is Berkeley County with 1,228 square miles.
Shelby County is the largest county in Tennessee by square miles, covering an area of approximately 784 square miles.
Marion County has the largest county population in Indiana.
The county of Allen in Indiana is 660 square miles in size. The county has a population of just over 350,000 people as of 2014.
The largest is Nye County with 18,147 square miles.
Osage County is the largest county in Oklahoma, measuring approximately 2,304 square miles.
Posey County, Indiana consists of 419 square miles.
It is Ware County with 903 square miles.
Keweenaw County - 5,966 square miles.