O'Fallon, IL Public Records
O'Fallon is an incorporated city in St. Clair County, Illinois, with an estimated population of 32,169 (U.S. Census Bureau, July 2024 estimate) and 15.8 square miles of land. That is down about 263 residents since the 2020 Census base.
🏢 O'Fallon City Hall
O'Fallon's own city government keeps its local records: council or board meeting minutes, local ordinances and resolutions, local permits and licenses, and its own budget and contracts. Requests for those records go to the city clerk under the Illinois Freedom of Information Act. Birth and death certificates, marriage records, deeds and court files are generally kept by county and state offices rather than by the city; see the offices below.
📇 O'Fallon Contact on File
| Government | City Of O Fallon |
| Contact listed | City Administrator |
| Mailing address | 255 S Lincoln Ave, O Fallon, IL 62269 |
| Phone | Not stated |
| Official website | www.ofallon.org |
| Source | U.S. Census Bureau, 2022 Census of Governments: Government Units listing ↗ |
This is the mailing address the government reported to the U.S. Census Bureau; it may be a post office box or the office of an elected official rather than a public counter, and the source does not list a phone number. The website was reported by the government and was answering when we last checked. Call or check the official website before you visit.
↑ Back to record types🏛️ County Courthouse & Records Office for O'Fallon
O'Fallon is in St. Clair County. In Illinois, deeds, mortgages and other land records are recorded by the county Recorder (in some counties, the County Clerk). Divorce cases in Illinois are heard by the Circuit Court in each county. Wills and estates in Illinois are handled by the Circuit Court in each county.
📍 St. Clair County at a Glance
| County | St. Clair County |
| County population (2024 est.) | 251,149 Source: www2.census.gov ↗ |
⚖️ St. Clair County Circuit Clerk
| Address | 10 Public Square, Belleville, Illinois 62220-1623 |
| Directions | Get directions ↗ |
| Phone | (618) 277-6832 |
| Hours | Not stated |
| Records available | Circuit court case records (civil, criminal, traffic, family, probate, small claims) |
| Official website | Not stated |
| Sources | illinoiscourts.gov/…/circuit-court-clerks ↗ |
| Last verified | October 16, 2026 |
See the full St. Clair County records page →
↑ Back to record types📋 Where to Get Records for O'Fallon
Where to get the most-requested public records for people and property in O'Fallon, IL:
📋 O'Fallon Records Guide
| Birth & death certificates | Illinois Department of Public Health – Vital RecordsIn Illinois, certified birth and death certificates can also be ordered from the County Clerk. |
| Deeds & property records | In Illinois, deeds, mortgages and other land records are recorded by the county Recorder (in some counties, the County Clerk). |
| Court cases & divorce | St. Clair County courthouse. Divorce cases in Illinois are heard by the Circuit Court in each county. |
| Wills & estates | Wills and estates in Illinois are handled by the Circuit Court in each county. |
| State court system | Illinois Courts |
| Sex offender registry | Illinois Sex Offender Registry (Illinois State Police) |