City in Jefferson County, Illinois · 14.6 sq mi · 962 people per sq mi
14,091 people live in Mount Vernon. The typical household earns $55,357, and the median resident is 38.9 years old.
2026 projection
From 14,600 in 2020
Poverty rate 17.3%
Men 34.9 · Women 43.7
1860–2026
14,091
2026 projection
3.5% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1860–2026
14,091
2026 projection
3.5% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 14,091 | -96 | 0.68% |
|---|---|---|---|
| 2025 | 14,187 | +5 | 0.04% |
| 2024 | 14,182 | -86 | 0.60% |
| 2023 | 14,268 | -34 | 0.24% |
| 2022 | 14,302 | -209 | 1.44% |
| 2021 | 14,511 | -89 | 0.61% |
| 2020 | 14,600 | -100 | 0.68% |
| 2019 | 14,700 | -41 | 0.28% |
| 2018 | 14,741 | -114 | 0.77% |
| 2017 | 14,855 | -85 | 0.57% |
Showing 10 of 32 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
Mount Vernon has a population change lower than Jefferson County, Illinois, and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 141 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 6 residents
40% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 40% | 42% | 38% |
| Never married | 35% | 40% | 29% |
| Divorced | 16% | 14% | 17% |
| Widowed | 8% | 2% | 13% |
| Separated | 2% | 1% | 2% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources