St. Clair County, Missouri

St. Clair 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 ST CLAIR GUS Population: 9,848 (2024) ID: 168766	County	Official County Government	Contact: COUNTY CLERK PO BOX 525, OSCEOLA MO 64776-0525
CITY OF APPLETON CITY GUS Population: 1,080 (2024) ID: 193643	Municipal	Municipal Government Within County	Contact: CITY CLERK 114 E 4TH ST, APPLETON CITY MO 64724-0134
CITY OF OSCEOLA GUS Population: 979 (2024) ID: 186254	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 561, OSCEOLA MO 64776-0561
CITY OF LOWRY CITY GUS Population: 652 (2024) ID: 129586	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 143, LOWRY CITY MO 64763-0143
VILLAGE OF COLLINS GUS Population: 133 (2024) ID: 169102	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 48, COLLINS MO 64738-0048
TOWN OF ROSCOE GUS Population: 93 (2024) ID: 169105	Municipal	Municipal Government Within County	Contact: CHAIRMAN OF THE BOARD PO BOX 34, ROSCOE MO 64781-0034
VILLAGE OF VISTA GUS Population: 37 (2024) ID: 169103	Municipal	Municipal Government Within County	Contact: VISTA VILLAGE PO BOX 525, OSCEOLA MO 64776
TOWN OF GERSTER GUS Population: 19 (2024) ID: 169104	Municipal	Municipal Government Within County	Contact: CLERK PO BOX 525, OSCEOLA MO 64776