Troy Mills is an unincorporated community in northern Linn County, Iowa, United States.

It lies along local roads north of the city of Cedar Rapids, the county seat of Linn County.

[2] Although Troy Mills is unincorporated, it has a post office, with the ZIP code of 52344,[4] which opened on 10 June 1867,[5] and a full volunteer fire department.

A gristmill and sawmill had existed there previously.

This article about the geography of Linn County, Iowa is a stub.