Old Linn County Jail

The Old Linn County Jail, also known as City Hall, at 312 Main Street in Mound City in Linn County, Kansas was built in 1867–68. It was listed on the National Register of Historic Places in 1978.

It is two-story front-gabled building with 21 in thick brick walls on a 27 x plan.

The building began serving as city hall for Mound City in 1903.