Photo: T.M. Sinclair Mansion, circa 1884-1886, located at 2160 Linden Drive, SE, Cedar Rapids. Listed on the National Register of Historic Places in 1988. Photographed by User:Brettstout (own work), 2005, [public domain, via Wikimedia Commons, accessed March, 2023.
Linn County administrative offices are located at 935 2nd Street SW, Cedar Rapids, IA 52404; phone: 319-892-5000.
Linn County was established in 1837 when Iowa was a part of the Wisconsin Territory. The Iowa Territory was established by Congress in 1838. It was named for Louis F. Linn [1796-1843], a U.S. Senator from Missouri.