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Allen County, Indiana is 660 sq miles.
Allen County, in Indiana, measures approximately 657 square miles.
657 sq mi
The largest county is Allen (657sq. mi., 1,702 km²)
There are 2,569 square miles in Lincoln County, Nevada.
The smallest county in Texas is Rockwall County, which is about 147 square miles in size.
Marquette County, Michigan is 3,425 square miles.
Hennepin County, Minnesota is 606 square miles.
Darlington County, SC is 567 square miles.
Onondaga County, NY is 806 square miles.
Tillamook County, Oregon is 1,133 square miles.
Jackson County in Florida covers approximately 917 square miles.