Migration to and from Williamson County, Illinois
Where Williamson 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
3,843
people moved in (5-yr)
Total outflow
3,351
people moved out (5-yr)
Net migration
+492
inflow minus outflow
Top 10 counties people moved IN from
| Origin | State / Region | People (5-yr) |
|---|---|---|
| Jackson County | Illinois | 543 |
| Franklin County | Illinois | 442 |
| McDonough County | Illinois | 219 |
| Randolph County | Illinois | 208 |
| Saline County | Illinois | 150 |
| Marion County | Illinois | 145 |
| Madison County | Illinois | 137 |
| St. Louis County | Minnesota | 132 |
| Hermantown City | St. Louis County, Minnesota | 132 |
| Union County | Illinois | 128 |
Top 10 counties people moved OUT to
| Destination | State / Region | People (5-yr) |
|---|---|---|
| Franklin County | Illinois | 502 |
| Jackson County | Illinois | 453 |
| Saline County | Illinois | 198 |
| Pinellas County | Florida | 165 |
| Union County | Illinois | 96 |
| Allegheny County | Pennsylvania | 91 |
| Pittsburgh City | Allegheny County, Pennsylvania | 87 |
| Edgar County | Illinois | 72 |
| Jefferson County | Tennessee | 70 |
| Lackawanna County | Pennsylvania | 69 |
Explore Williamson County
- Business data for Williamson 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: 17199.