Market insights · Illinois
Montgomery County, IL: growth, migration and housing
Montgomery County has 28,076 residents, down 0.6% since 2020 (+0.9% in the last year). In 2022–2023, 453 households moved in and 533 moved out (-80 net), while a net $3.3M of income left. Median household income is $63,620, the median home $112,300 and median rent $723 a month.
In Illinois: 25th of 102 counties for 5-year population growth · 73rd of 102 counties for net in-migration (per resident) · 66th of 102 counties for median household income · 74th of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Montgomery County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Macoupin County, IL | 81 | $3.3M |
| Madison County, IL | 44 | $2.2M |
| Sangamon County, IL | 40 | $2.1M |
| Christian County, IL | 33 | $1.8M |
| Bond County, IL | 30 | $1.3M |
| Fayette County, IL | 25 | $0.7M |
Where leavers went
Top counties by households leaving Montgomery County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Macoupin County, IL | 90 | $4.3M |
| Sangamon County, IL | 51 | $2.7M |
| Madison County, IL | 41 | $2.1M |
| Christian County, IL | 30 | $1.4M |
| Bond County, IL | 24 | $0.8M |
| Fayette County, IL | 21 | $1.0M |
| St. Louis County, MO | 21 | $1.1M |
BizyFi in Montgomery County
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Sources: U.S. Census Bureau population estimates (vintage 2025), American Community Survey 5-year (2024), and IRS Statistics of Income county-to-county migration data (2022–2023). Migration counts are tax returns (roughly households) moving between U.S. counties; the IRS suppresses very small flows. Growth rates, per-1,000 figures, rent share and state ranks are BizyFi calculations. Data updated 2026-10-17. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.