Borough in Allegheny County, Pennsylvania · 0.3 sq mi · 9,385 people per sq mi
3,186 people live in Mount Oliver. The typical household earns $52,297, and the median resident is 36.1 years old.
2026 projection
From 3,394 in 2020
Poverty rate 15.07%
Men 38.2 · Women 33.3
1880–2026
3,186
2026 projection
6.1% 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.
1880–2026
3,186
2026 projection
6.1% 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 | 3,186 | -36 | 1.12% |
|---|---|---|---|
| 2025 | 3,222 | -21 | 0.65% |
| 2024 | 3,243 | -28 | 0.86% |
| 2023 | 3,271 | -31 | 0.94% |
| 2022 | 3,302 | -47 | 1.40% |
| 2021 | 3,349 | -45 | 1.33% |
| 2020 | 3,394 | -4 | 0.12% |
| 2019 | 3,398 | -4 | 0.12% |
| 2018 | 3,402 | -7 | 0.21% |
| 2017 | 3,409 | -15 | 0.44% |
Showing 10 of 29 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 Oliver has a population change lower than Allegheny County, Pennsylvania, 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 33 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 7 residents
36% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 36% | 37% | 34% |
| Never married | 49% | 47% | 51% |
| Divorced | 11% | 12% | 10% |
| Widowed | 3% | <1% | 6% |
| Separated | 2% | 3% | 0% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources