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Monmouth, IL
Full City Profile · Illinois · Warren County County
3.0
/5.0
B
Good
8,794
Population
2,074/sq mi density
$59,690
Median Income
$29,251 per capita
$88,100
Home Value
$107,948 Zillow
$652
Median Rent
17.9% income on rent
51°F
Avg Temperature
275 sunny days/yr
257
Violent Crime/100K
1,957 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.5 / 5.0
$59,690 median income, 4.5% unemployment
A+
Affordability
5.0 / 5.0
$88,100 home value, $652/mo rent
F
Safety
1.0 / 5.0
257 violent crimes/100K
C
Education
2.5 / 5.0
18.7% bachelor's degree or higher
Change Over Time (2013–2023)
Population Change
-8%
9,355 → 8,603
over 10 years
Annual Pop. Growth
-0.83%
Compound annual growth rate
Median Income Change
+76.4%
$33,842 → $59,690
nominal, not inflation-adjusted
Annual Income Growth
+5.84%
Compound annual growth rate
Population Over Time
Total population for Monmouth across each available Census ACS release.
Median Household Income Over Time
Median household income reported by U.S. Census ACS. Values are nominal (not adjusted for inflation).
Projected 2030
Simple projections extrapolating the 2013–2023 compound annual growth rate forward. These are mathematical extensions of recent trends, not forecasts — real outcomes depend on migration, policy and economic shifts.
Projected Population 2030
8,115
-488 from 2023 (8,603)
Projected Median Income 2030
$88,808
+$29,118 from 2023 ($59,690)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2013 | 9,355 | — | $33,842 | — |
| 2015 | 9,253 | -1.1% | $36,067 | +6.6% |
| 2017 | 9,038 | -2.3% | $39,173 | +8.6% |
| 2019 | 8,870 | -1.9% | $44,037 | +12.4% |
| 2021 | 8,778 | -1% | $54,400 | +23.5% |
| 2023 | 8,603 | -2% | $59,690 | +9.7% |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.