St. Charles County, Missouri
St. Charles 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 |
|---|---|---|---|
|
GUS Population: 423,726 (2024)
ID: 194522
|
County | Official County Government |
Contact: COUNTY EXECUTIVE
100 N 3RD STREET, SUITE 318, SAINT CHARLES MO 63301
|
|
GUS Population: 95,355 (2024)
ID: 208643
|
Municipal | Municipal Government Within County |
Contact: COMMUNICATIONS DIRECTOR
100 N MAIN ST, O FALLON MO 63366-2200
|
|
GUS Population: 72,458 (2024)
ID: 169095
|
Municipal | Municipal Government Within County |
Contact: MAYOR
200 N 2ND ST, SAINT CHARLES MO 63301-2891
|
|
GUS Population: 61,398 (2024)
ID: 194619
|
Municipal | Municipal Government Within County |
Contact: CITY ADMINISTRATOR
PO BOX 9, SAINT PETERS MO 63376-0090
|
|
GUS Population: 48,646 (2024)
ID: 107697
|
Municipal | Municipal Government Within County |
Contact: COMMUNITY DEVELOPMENT DIRECTOR
200 W 4TH ST, WENTZVILLE MO 63385-1422
|
|
GUS Population: 19,160 (2024)
ID: 204832
|
Municipal | Municipal Government Within County |
Contact: CITY ADMINISTRATOR
200 CIVIC CENTER DR, LAKE ST LOUIS MO 63367-1307
|
|
GUS Population: 14,407 (2024)
ID: 129585
|
Municipal | Municipal Government Within County |
Contact: MAYOR OF DARDENNE PRAIRIE
2032 HANLEY RD, STE 113, O FALLON MO 63368-6706
|
|
GUS Population: 6,378 (2024)
ID: 190685
|
Municipal | Municipal Government Within County |
Contact: MAYOR
5490 5TH ST, COTTLEVILLE MO 63304-8047
|
|
GUS Population: 5,304 (2024)
ID: 169097
|
Municipal | Municipal Government Within County |
Contact: CITY ADMINISTRATOR
5401 INDEPENDENCE RD, WELDON SPRING MO 63304-7845
|
|
GUS Population: 3,725 (2024)
ID: 107699
|
Municipal | Municipal Government Within County |
Contact: CITY ADMINISTRATOR
2300 SAINT PAUL RD, SAINT PAUL MO 63366-5101
|
|
GUS Population: 751 (2024)
ID: 169100
|
Municipal | Municipal Government Within County |
Contact: CITY ADMINISTRATOR
121 MULBERRY ST, FORISTELL MO 63348-1483
|
|
GUS Population: 561 (2024)
ID: 169098
|
Municipal | Municipal Government Within County |
Contact: CITY CLERK
PO BOX 196, FLINTHILL MO 63346-0196
|
|
GUS Population: 547 (2024)
ID: 107698
|
Municipal | Municipal Government Within County |
Contact: MAYOR
PO BOX 114, NEW MELLE MO 63365-0114
|
|
VILLAGE OF JOSEPHVILLE
GUS Population: 517 (2024)
ID: 169099
|
Municipal | Municipal Government Within County |
Contact: CHAIRMAN
1010 KERSTING RD, WENTZVILLE MO 63385-3123
|
|
TOWN OF WEST ALTON
GUS Population: 353 (2024)
ID: 169096
|
Municipal | Municipal Government Within County |
Contact: CITY CLERK
PO BOX 42, WEST ALTON MO 63386-0042
|
|
CITY OF PORTAGE DES SIOUX
GUS Population: 323 (2024)
ID: 193642
|
Municipal | Municipal Government Within County |
Contact: MAYOR
PO BOX 108, PORTAGE DES SIOUX MO 63373-0108
|
|
GUS Population: 268 (2024)
ID: 107696
|
Municipal | Municipal Government Within County |
Contact: CHAIRMAN
PO BOX 42, AUGUSTA MO 63332-0042
|
|
TOWN OF WELDON SPRING HEIGHTS
GUS Population: 92 (2024)
ID: 169101
|
Municipal | Municipal Government Within County |
Contact: CHAIRMAN
32 WELDON SPRING HEIGHTS DR, SAINT CHARLES MO 63304-5623
|