Washington County, Iowa

Washington 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 WASHINGTON GUS Population: 22,631 (2024) ID: 164277	County	Official County Government	Contact: CHAIRMAN PO BOX 889, WASHINGTON IA 52353-0889
CITY OF WASHINGTON GUS Population: 7,281 (2024) ID: 164593	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 516, WASHINGTON IA 52353-0516
CITY OF KALONA GUS Population: 2,762 (2024) ID: 138246	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 1213, KALONA IA 52247-1213
CITY OF WELLMAN GUS Population: 1,531 (2024) ID: 164594	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 129, WELLMAN IA 52356-0129
CITY OF RIVERSIDE GUS Population: 1,063 (2024) ID: 208074	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 188, RIVERSIDE IA 52327-0188
CITY OF BRIGHTON GUS Population: 592 (2024) ID: 104485	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 336, BRIGHTON IA 52540-0336
CITY OF AINSWORTH GUS Population: 511 (2024) ID: 164592	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 126, AINSWORTH IA 52201-0126
CITY OF CRAWFORDSVILLE GUS Population: 278 (2024) ID: 190211	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 186, CRAWFORDSVILLE IA 52621-0186
CITY OF WEST CHESTER GUS Population: 147 (2024) ID: 164595	Municipal	Municipal Government Within County	Contact: CITY CLERK 508 MAIN ST., WEST CHESTER IA 52359