Thornburg, Pennsylvania Demographics & Population 2026

A note before these figures: with a population of 464, Thornburg's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Thornburg is a small community located in Pennsylvania, within Allegheny County. The total population is 464. It ranks as the 1381st most populous out of 1,991 Census-designated places in Pennsylvania.

Age Demographics

The median age in Thornburg is 43.0 years. This is 5% higher than the state median of 40.9 years. With 28.0% of the population under 18, Thornburg has a notably young demographic profile, suggesting a family-oriented community.

Economy, Income & Housing

The median household income in Thornburg is $231,250. This is 197% higher than the state median of $77,971. It is also 186% higher than the national median of $80,734. The poverty rate stands at 0.2%. This is 98% lower than the state poverty rate of 11.7%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 1.2%. This is 77% lower than the state rate of 5.3%. The median home value is $469,100. Housing costs are 84% higher than the state median of $254,500. With a home-value-to-income ratio of just 2.0x, Thornburg is one of the most affordable housing markets in the area. 95.6% of occupied housing units are owner-occupied. This homeownership rate is 38% higher than the state average of 69.3%.

Race & Ethnicity

Thornburg has a predominantly White (non-Hispanic) population, comprising 87.1% of all residents. Hispanic or Latino residents account for 4.7%. The Black or African American population (0.9%) is well below the state average of 10.3%. The Asian population (0.7%) is well below the state average of 3.8%.

Education

78.4% of residents aged 25 and older hold a bachelor's degree or higher. This places Thornburg in the top 10% of all cities in the state for educational attainment. This is 123% higher than the state rate of 35.2%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 98.8%. Notably, 38.9% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Thornburg, Pennsylvania is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Pennsylvania state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,991 Census-designated places in Pennsylvania. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.