ZIP code · Mifflinville · Pennsylvania · United States
ZIP code 18631 — Mifflinville
ZIP code 18631 serves Mifflinville, Pennsylvania.
- Postal code
- 18631Single source Value from one source, not cross-checked.
- City
- Mifflinville
- County
- Columbia FIPS 42037
- State
- Pennsylvania
- Country
- United States
- Coordinates
- 41.0323, -76.3080 — precision precise (locality)
View on OpenStreetMap - Population
- 1,109 (ZCTA, ACS 5-year)
- Population density
- 781 / sq mi
- Land area
- 1.4 sq mi (3.7 km²) (ZCTA, ACS 5-year)
- Median household income
- $49,643
- Per-capita income
- $28,996
- Median age
- 48.3
- Households
- 510
- Housing units
- 555
- Median home value
- $214,900
- Median gross rent
- $990 / month
- Congressional district
- PA-9 (119th Congress)
- USDA hardiness zone
- 6b (-5 to 0 °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 18631 with another ZIP · ZIPs within 25 miles · distance from 18631
Map of ZIP code 18631
Climate — monthly normals
Warmest month Jul (avg high 80°F), coldest Jan (avg low 16°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 33 | 36 | 44 | 58 | 69 | 76 | 80 | 78 | 72 | 60 | 48 | 38 |
| Avg low °F | 16 | 18 | 25 | 35 | 46 | 55 | 58 | 57 | 50 | 39 | 31 | 22 |
| Precip in | 3.2 | 2.5 | 3.4 | 4.4 | 4.7 | 4.5 | 4.5 | 4.5 | 4.9 | 4.8 | 3.4 | 3.6 |
NOAA 1991–2020 climate normals from the nearest station: BENTON 3 NE (13.9 mi) · NOAA NCEI
Places in ZIP 18631
- 3 restaurants & cafés
- 1 post offices
- 1 places of worship
- 1 banks
- 2 gas stations
- 1 EV charging stations
- 1 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
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