City profile · Small City
O'Fallon, Missouri
Verified Oct 11, 2026Who leads O'Fallon, with the evidence behind the record.
City leadership
- Leader
- Bill Hennessy
- Role
- Mayor
- Party
- Nonpartisan
- Population
- 46,169
- Census Bureau estimate
- Last verified
- Oct 11, 2026
- Matched the official page in an automated check
- Last checked
- Oct 11, 2026
- The check matched the published record
Source & verification
- Verification sourceofallonmo.gov/government/elected_officials/mayor_bill_hennessy.php ↗
- Official leadership pageofallonmo.gov/government/elected_officials/mayor_bill_hennessy.php ↗
- City websiteofallonmo.gov ↗
“Last checked” is when we last looked at the source. “Last verified” is when the record was last confirmed. A page we couldn't read never counts as a verification.
Record history
Published records only. Possible changes still under review are not shown here.
Leaders on record
- Bill Hennessy CurrentMayor · added May 4, 2026 · verified Oct 11, 2026
Reviewed changes
No reviewer-published changes yet.
Demographics
Census Bureau data for the city
- Population
- 46,169
- Median household income
- $104,863
- Median age
- 38
- Land area
- 30.55 sq mi
- Population density
- 1,511.3 per sq mi
- County
- St. Charles County
- Metro area
- St. Louis, MO-IL
City government
Budget and contact
- Annual budget
- ~$162M
- City hall phone
- (636) 240-2000
- Official website
- ofallonmo.gov ↗
Use this record in your app
The same leadership and verification fields are available from the API.
curl https://api.civicgrid.org/cities/754 \
-H "Authorization: Bearer cg_live_..."