ZIP code · Chalk Hill · Pennsylvania · United States
ZIP code 15421 — Chalk Hill
ZIP code 15421 serves Chalk Hill, Pennsylvania.
- Postal code
- 15421Single source Value from one source, not cross-checked.
- City
- Chalk Hill
- County
- Fayette FIPS 42051
- State
- Pennsylvania
- Country
- United States
- Coordinates
- 39.8451, -79.5991 — precision estimated (postal-area centroid)
View on OpenStreetMap - Population
- 84 (ZCTA, ACS 5-year)
- Population density
- 315 / sq mi
- Land area
- 0.3 sq mi (0.7 km²) (ZCTA, ACS 5-year)
- Median household income
- $250,000+
- Per-capita income
- $139,582
- Median age
- 62.7
- Households
- 49
- Housing units
- 133
- Median home value
- $229,900
- Congressional district
- PA-14 (119th Congress)
- USDA hardiness zone
- 6a (-10 to -5 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/New_York (UTC−5 / UTC−4 DST)
Tools: compare 15421 with another ZIP · ZIPs within 25 miles · distance from 15421
Map of ZIP code 15421
Climate — monthly normals
Warmest month Jul (avg high 79°F), coldest Jan (avg low 15°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 38 | 48 | 61 | 69 | 75 | 79 | 77 | 71 | 61 | 49 | 39 |
| Avg low °F | 15 | 17 | 24 | 33 | 43 | 52 | 56 | 54 | 47 | 36 | 27 | 20 |
| Precip in | 4.6 | 4.1 | 5.0 | 4.7 | 5.2 | 5.7 | 4.7 | 4.5 | 4.7 | 3.8 | 4.1 | 4.5 |
NOAA 1991–2020 climate normals from the nearest station: CHALK HILL 2 ENE (0.6 mi) · NOAA NCEI
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page