ZIP code · South Mountain · Pennsylvania · United States
ZIP code 17261 — South Mountain
ZIP code 17261 serves South Mountain, Pennsylvania.
- Postal code
- 17261Single source Value from one source, not cross-checked.
- City
- South Mountain
- County
- Franklin FIPS 42055
- State
- Pennsylvania
- Country
- United States
- Coordinates
- 39.8465, -77.4878 — precision precise (locality)
View on OpenStreetMap - Population
- 26 (ZCTA, ACS 5-year)
- Population density
- 16 / sq mi
- Land area
- 1.6 sq mi (4.2 km²) (ZCTA, ACS 5-year)
- Median age
- 18.1
- Households
- 0
- Housing units
- 0
- Congressional district
- PA-13 (119th Congress)
- USDA hardiness zone
- 7a (0 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 17261 with another ZIP · ZIPs within 25 miles · distance from 17261
Map of ZIP code 17261
Climate — monthly normals
Warmest month Jul (avg high 81°F), coldest Jan (avg low 21°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 36 | 39 | 47 | 59 | 69 | 77 | 81 | 79 | 73 | 61 | 50 | 40 |
| Avg low °F | 21 | 21 | 28 | 38 | 49 | 58 | 62 | 60 | 53 | 43 | 33 | 26 |
| Precip in | 3.7 | 2.9 | 4.4 | 4.2 | 4.7 | 4.6 | 3.9 | 3.9 | 5.1 | 4.1 | 3.3 | 3.8 |
NOAA 1991–2020 climate normals from the nearest station: S MTN (0.9 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