Thornburg Flag

Thornburg

County Seat:
No
Area (mi²):
0.438
State:
Pennsylvania

Thornburg is a borough located in Allegheny County, Pennsylvania. Thornburg has a 2026 population of 449. Thornburg is currently declining at a rate of -0.44% annually and its population has decreased by -3.44% since the most recent census, which recorded a population of 465 in 2020.

449
Total Population
1,026
Density (mi²)
-2 -0.44%
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)