Winneshiek County, Iowa

Winneshiek 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 WINNESHIEK GUS Population: 19,723 (2024) ID: 204454	County	Official County Government	Contact: SUPERVISOR 201 W MAIN ST, DECORAH IA 52101-1775
CITY OF DECORAH GUS Population: 7,454 (2024) ID: 193325	Municipal	Municipal Government Within County	Contact: CITY CLK TR PO BOX 138, DECORAH IA 52101-0138
CITY OF CALMAR GUS Population: 1,100 (2024) ID: 204492	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 268, CALMAR IA 52132-0268
CITY OF OSSIAN GUS Population: 777 (2024) ID: 126729	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 295, OSSIAN IA 52161-0295
CITY OF SPILLVILLE GUS Population: 371 (2024) ID: 190212	Municipal	Municipal Government Within County	Contact: CITY CLERK 201 OAK ST, SPILLVILLE IA 52168-4414
CITY OF FORT ATKINSON GUS Population: 300 (2024) ID: 164609	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 155, FORT ATKINSON IA 52144-0155
CITY OF RIDGEWAY GUS Population: 261 (2024) ID: 164611	Municipal	Municipal Government Within County	Contact: MAYOR 690 COUNTY ST, RIDGEWAY IA 52165
CITY OF CASTALIA GUS Population: 141 (2024) ID: 104494	Municipal	Municipal Government Within County	Contact: CASTALIA CITY CLERK 108 WEST GREENE ST, CASTALIA IA 52133-0127
CITY OF JACKSON JUNCTION GUS Population: 38 (2024) ID: 164610	Municipal	Municipal Government Within County	Contact: MAYOR 1201 COUNTY ROAD V68, JACKSON JUNCTION IA 52171-8309