Migration to and from St. Clair County, Illinois
Where St. Clair County residents came from and where they went over the 5-year window 2016-2020. Census ACS County-to-County Migration Flows, 2020 5-yr (frozen vintage).
Total inflow
15,974
people moved in (5-yr)
Total outflow
17,074
people moved out (5-yr)
Net migration
-1,100
inflow minus outflow
Top 10 counties people moved IN from
| Origin | State / Region | People (5-yr) |
|---|---|---|
| Madison County | Illinois | 1,978 |
| St. Louis City | Missouri | 1,099 |
| St. Louis County | Missouri | 1,033 |
| Africa | 543 | |
| Cook County | Illinois | 540 |
| Asia | 448 | |
| Monroe County | Illinois | 389 |
| Europe | 383 | |
| Clinton County | Illinois | 314 |
| Montgomery County | Alabama | 296 |
Top 10 counties people moved OUT to
| Destination | State / Region | People (5-yr) |
|---|---|---|
| Madison County | Illinois | 2,115 |
| St. Louis County | Missouri | 1,477 |
| St. Louis City | Missouri | 1,217 |
| Monroe County | Illinois | 706 |
| El Paso County | Colorado | 582 |
| Jefferson County | Missouri | 400 |
| Clark County | Nevada | 285 |
| Pierce County | Washington | 277 |
| Sangamon County | Illinois | 240 |
| Tazewell County | Illinois | 240 |
Explore St. Clair County
- Business data for St. Clair CountyConstruction sector establishments, employment, payroll
- Cities in IllinoisACS demographic profiles for places statewide
- ZIP code lookupSearch demographic data by ZIP code
- Opportunity IndexRank counties by business growth potential
- Federal contracts in ILGovBids: RFPs, awards, NAICS matching
- New business filings in IllinoisNewFilings: fresh SOS registrations
Methodology
- Counts represent the number of people aged 1+ who reported a different residence at the survey reference date than they did one year earlier, aggregated across the 5-year sample window 2016-2020.
- Outbound (OUT) flows are reported less frequently than inbound (IN) because the survey captures the destination side of each move. Many county pairs have null OUT counts, which is normal.
- "Total inflow" sums the published MOVEDIN counts across all origin counties, including foreign-region inflows (Africa, Asia, Central America, etc.). It is not the same as net population change.
- Frozen vintage. The Census Bureau has not released a newer county-to-county migration flows file. The 2020 5-yr vintage (covering 2016-2020) is the latest available as of build date.
Source: U.S. Census Bureau, American Community Survey, County-to-County Migration Flows: 2016-2020. Vintage: 2020 5-yr. Generated: 2026-05-28. FIPS: 17163.