Commercial Real Estate Market in Illiopolis, IL
Updated monthly: sale, lease, property records, location trend, and more… · Last update: August 31
1 active listing and 109 off-market properties in Illiopolis, IL.
Market Trends
Illiopolis, IL spans 46.4 square miles in Sangamon County, Illinois. Figures below refresh monthly; last updated 31 August 2026.
Office
Office vacancy in Illiopolis, IL runs 21.3% across the Midwest region in 2025, up from 13.7% in 2019.
Vacancy Rate % in Midwest region
Retail
Retail vacancy in Illiopolis, IL runs 6.3% across the Midwest region in 2025, down from 8% in 2020.
Vacancy Rate % in Midwest region
Industrial
Industrial vacancy in Illiopolis, IL runs 4.9% across the Midwest region in 2025, up from 4.4% in 2019. Nearly 1.6x the 2022 low of 3.1%.
Vacancy Rate % in Midwest region
Multifamily
Multifamily vacancy in Illiopolis, IL runs 8% across the Midwest region in 2025, up from 6.5% in 2022.
Vacancy Rate % in Midwest region
Market overview
Demographics & Economy
Illiopolis, IL has 1,264 residents in 561 households. Density runs 27 people per square mile. Median household income here is $88,583 and median gross rent $675 a month.
1,264
Population
561
Households
2.3
Avg Household Size
42
Median Age
29%
College-Educated
92%
High-School Grad
46.4 sq mi
ZIP Area
27
Density / Sq Mi
$88,583
Median Household Income
$51,591
Median Earnings
$675
Median Rent
$108,300
Median Home Value
Tools
Nearby Markets
| Market | Average Sale Price, $/SF | Average Lease Price, $/SF/Yr |
|---|---|---|
| Niantic | — | — |
| Lanesville | — | — |
| Mount Auburn | — | — |
| Harristown | — | — |
Frequently Asked Questions
Where does Realmo's Illiopolis market data come from?
Realmo compiles Illiopolis, IL figures from 5 recent recorded sales, 1 active sale listings, 109 tracked off-market properties. Sale and lease figures refresh monthly; vacancy annually. Last updated 31 August 2026.
Methodology & data sources
- Asking prices and averages
- Computed from 1 active for-sale and 0 active for-lease listings in Illiopolis, IL. These are ASKING figures from live listings, not closed-transaction prices, and a segment carried by a handful of listings reads as indicative rather than an average.
- Vacancy rates
- Published per-sector market series, taken at the metro level where one exists and otherwise at the Census-region level — a chart reading "in <region> region" is a regional number, not this city's.
- Refresh
- The monthly aggregates close at the end of the previous month, so 31 August 2026 — not today — is the honest last update.
- Known limitations
- office vacancy is reported at Midwest region level, retail vacancy is reported at Midwest region level and industrial vacancy is reported at Midwest region level.
- Coverage
- Metrics below the 10-observation threshold fall back one geographic level. The geography used is named on each figure.
Compiled by the Realmo Data team · reviewed 31 August 2026 · report a data issue
