Monongahela Flag

Monongahela

County Seat:
No
Area (mi²):
1.913
State:
Pennsylvania

Monongahela is a city located in Washington County, Pennsylvania. Monongahela has a 2026 population of 4,072. Monongahela is currently declining at a rate of -0.46% annually and its population has decreased by -1.81% since the most recent census, which recorded a population of 4,147 in 2020.

4.1K
Total Population
2,129
Density (mi²)
-19 -0.46%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)