Cass County, Iowa

Cass County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF CASS GUS Population: 13,024 (2024) ID: 164239	County	Official County Government	Contact: COUNTY AUDITOR 5 W 7TH ST, ATLANTIC IA 50022-1461
CITY OF ATLANTIC GUS Population: 6,717 (2024) ID: 211248	Municipal	Municipal Government Within County	Contact: CITY CLERK 23 E 4TH ST, ATLANTIC IA 50022
CITY OF GRISWOLD GUS Population: 975 (2024) ID: 204458	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 760, GRISWOLD IA 51535-0760
CITY OF ANITA GUS Population: 953 (2024) ID: 164325	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 246, ANITA IA 50020-0246
CITY OF LEWIS GUS Population: 358 (2024) ID: 138198	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 66, LEWIS IA 51544-0066
CITY OF MASSENA GUS Population: 352 (2024) ID: 164327	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 109, MASSENA IA 50853-0109
CITY OF CUMBERLAND GUS Population: 248 (2024) ID: 126581	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 178, CUMBERLAND IA 50843-0178
CITY OF MARNE GUS Population: 109 (2024) ID: 164326	Municipal	Municipal Government Within County	Contact: CITY CLERK 401 WASHINGTON ST, MARNE IA 51552
CITY OF WIOTA GUS Population: 91 (2024) ID: 126582	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 17, WIOTA IA 50274-0017