County demographics · Pennsylvania
Westmoreland County, Pennsylvania demographics
Westmoreland County, Pennsylvania (county FIPS 42129) has a median household income of $74,109 (±$1,340) and a total population of 352,500 in the American Community Survey 5-year estimates for 2020-2024.
Margins of error are at the 90% confidence level. The figures describe 2020-2024 (dollars in 2024 dollars), not the present. 89 ZIP Code Tabulation Areas overlap the county (Census 2020).
Data as of Oct 22, 2026 (Olympus publication) · Markdown version
- Values are ACS 5-year estimates for 2020-2024 (dollars in 2024 dollars), not current figures.
- ZCTA-county overlaps come from the Census 2020 relationship file and use 2020 counties, by land area; Connecticut uses its legacy counties, not the planning regions in ACS 2022+.
ACS 5-year estimates, 2020-2024
Census American Community Survey 5-year estimates for 2020-2024, with 90% margins of error as published by the Census Bureau.
| Metric | Estimate | Margin of error (90%) | ACS table |
|---|---|---|---|
| Total population | 352,500 | none (controlled estimate) | B01003 |
| Median age | 47.2 years | ±0.2 years | B01002 |
| Households | 154,979 | ±839 | B11001 |
| Median household income (inflation-adjusted to the final ACS year) | $74,109 | ±$1,340 | B19013 |
| Median value of owner-occupied housing units | $203,500 | ±$2,976 | B25077 |
| Median gross rent | $879 | ±$20 | B25064 |
| Owner-occupied share of occupied housing units | 78.4% | none (derived from several estimates) | B25003 (derived) |
| Renter-occupied share of occupied housing units | 21.6% | none (derived from several estimates) | B25003 (derived) |
| High school graduate or higher (age 25+) | 95.6% | none (derived from several estimates) | B15003 (derived) |
| Bachelor's degree or higher (age 25+) | 32.8% | none (derived from several estimates) | B15003 (derived) |
| Share of people below the poverty level | 10.3% | none (derived from several estimates) | B17001 (derived) |
| Unemployment rate (civilian labor force) | 4.8% | none (derived from several estimates) | B23025 (derived) |
- Dollar values are in 2024 inflation-adjusted dollars.
- Percentages' margins of error are in percentage points (pp).
Geography
| Measure | Value |
|---|---|
| County FIPS | 42129 |
| Land area | 1,027.71 sq mi |
| Water area | 8.22 sq mi |
| Population density | 343 per sq mi of land |
| Geography vintage | 2024 Gazetteer |
ZIP codes (ZCTAs) in this county
ZCTAs that overlap the county in the Census 2020 ZCTA to county relationship file, largest share of the county's land first.
| ZCTA | Share of county land | Share of ZCTA land | County is the ZCTA's primary county |
|---|---|---|---|
| 15658 | 9% | 100% | Yes |
| 15601 | 7.8% | 100% | Yes |
| 15650 | 7.2% | 100% | Yes |
| 15642 | 4.4% | 98.1% | Yes |
| 15944 | 4.1% | 64.1% | Yes |
| 15670 | 4% | 100% | Yes |
| 15666 | 3.9% | 76.1% | Yes |
| 15613 | 3.5% | 61.9% | Yes |
| 15068 | 3.4% | 78% | Yes |
| 15627 | 3.1% | 100% | Yes |
| 15687 | 2.9% | 100% | Yes |
| 15632 | 2.9% | 100% | Yes |
| 15012 | 2.8% | 84.8% | Yes |
| 15717 | 2.8% | 30.3% | |
| 15610 | 2.6% | 67.3% | Yes |
| 15923 | 2.5% | 100% | Yes |
| 15677 | 2.4% | 100% | Yes |
| 15681 | 2.3% | 45% | |
| 15668 | 2.2% | 99.8% | Yes |
| 15644 | 2.2% | 100% | Yes |
| 15679 | 2.1% | 100% | Yes |
| 15479 | 2.1% | 100% | Yes |
| 15656 | 1.8% | 57.5% | Yes |
| 15089 | 1.7% | 98.5% | Yes |
| 15683 | 1.5% | 81.1% | Yes |
| 15655 | 1.1% | 100% | Yes |
| 15672 | 1.1% | 100% | Yes |
| 15639 | 1.1% | 100% | Yes |
| 15622 | 1% | 28.3% | |
| 15085 | 0.9% | 97.6% | Yes |
| 15618 | 0.8% | 29.4% | |
| 15779 | 0.8% | 100% | Yes |
| 15954 | 0.8% | 39.6% | |
| 15531 | 0.7% | 12.6% | |
| 15501 | 0.6% | 4.6% | |
| 15637 | 0.5% | 100% | Yes |
| 15626 | 0.4% | 100% | Yes |
| 15083 | 0.3% | 87.5% | Yes |
| 15062 | 0.3% | 100% | Yes |
| 15633 | 0.3% | 100% | Yes |
| 15684 | 0.2% | 100% | Yes |
| 15690 | 0.2% | 9.3% | |
| 15636 | 0.2% | 100% | Yes |
| 15671 | 0.2% | 100% | Yes |
| 15612 | 0.2% | 100% | Yes |
| 15688 | 0.2% | 100% | Yes |
| 15628 | 0.2% | 100% | Yes |
| 15697 | 0.2% | 100% | Yes |
| 15662 | 0.1% | 100% | Yes |
| 15698 | 0.1% | 100% | Yes |
| 15678 | 0.1% | 100% | Yes |
| 16229 | 0.1% | 4.9% | |
| 15616 | 0.1% | 100% | Yes |
| 15087 | 0.1% | 100% | Yes |
| 15623 | 0.1% | 100% | Yes |
| 15676 | 0.1% | 100% | Yes |
| 15646 | 0.1% | 100% | Yes |
| 15675 | 0.1% | 100% | Yes |
| 15448 | 0.1% | 100% | Yes |
| 15663 | 0.1% | 100% | Yes |
| 15620 | 0.1% | 100% | Yes |
| 15665 | 0.1% | 100% | Yes |
| 15611 | 0.1% | 100% | Yes |
| 15619 | 0.1% | 100% | Yes |
| 15625 | 0.1% | 100% | Yes |
| 15615 | 0.1% | 100% | Yes |
| 15695 | 0% | 100% | Yes |
| 15617 | 0% | 100% | Yes |
| 15693 | 0% | 100% | Yes |
| 15624 | 0% | 100% | Yes |
| 15640 | 0% | 100% | Yes |
| 15661 | 0% | 100% | Yes |
| 15689 | 0% | 100% | Yes |
| 15131 | 0% | 5.3% | |
| 15692 | 0% | 100% | Yes |
| 15635 | 0% | 100% | Yes |
| 15674 | 0% | 100% | Yes |
| 15660 | 0% | 100% | Yes |
| 15641 | 0% | 100% | Yes |
| 15638 | 0% | 100% | Yes |
| 15680 | 0% | 100% | Yes |
| 15629 | 0% | 100% | Yes |
| 15634 | 0% | 100% | Yes |
| 15696 | 0% | 100% | Yes |
| 15691 | 0% | 100% | Yes |
| 15647 | 0% | 100% | Yes |
| 15146 | 0% | 0.3% | |
| 15072 | 0% | 100% | Yes |
| 15137 | 0% | 0% |
Sources
- American Community Survey 5-year estimates (Census Data API) — U.S. Census Bureau. ACS 5-year 2020-2024 (release acs5-2024:county), source date 2025-09-02. https://api.census.gov/data/2024/acs/acs5?get=NAME,B01003_001E,B01003_001M,B01002_001E,B01002_001M,B11001_001E,B11001_001M,B19013_001E,B19013_001M,B25077_001E,B25077_001M,B25064_001E,B25064_001M,B25003_001E,B25003_002E,B25003_003E,B15003_001E,B15003_017E,B15003_018E,B15003_019E,B15003_020E,B15003_021E,B15003_022E,B15003_023E,B15003_024E,B15003_025E,B17001_001E,B17001_002E,B23025_003E,B23025_005E&for=county:129&in=state:42
- Published by Olympus on Oct 22, 2026.
- Source data: U.S. Census Bureau. Works of the U.S. government are not subject to copyright in the United States.
- This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
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curl -s "https://api.olympus.new-odyssey.com/v1/geo-demographics/counties/42129" -H "X-API-Key: $OLYMPUS_API_KEY"get_us_demographics {"county_fips":"42129"}