ZIP code · Allen · Maryland · United States
ZIP code 21810 — Allen
ZIP code 21810 serves Allen, Maryland.
- Postal code
- 21810Single source Value from one source, not cross-checked.
- City
- Allen
- County
- Wicomico FIPS 24045
- State
- Maryland
- Country
- United States
- Coordinates
- 38.2873, -75.6880 — precision precise (locality)
View on OpenStreetMap - Population
- 125 (ZCTA, ACS 5-year)
- Population density
- 263 / sq mi
- Land area
- 0.5 sq mi (1.2 km²) (ZCTA, ACS 5-year)
- Median household income
- $133,201
- Per-capita income
- $59,254
- Median age
- 69.3
- Households
- 59
- Housing units
- 59
- Median home value
- $233,500
- Congressional district
- MD-1 (119th Congress)
- USDA hardiness zone
- 7b (5 to 10 °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 21810 with another ZIP · ZIPs within 25 miles · distance from 21810
Map of ZIP code 21810
Climate — monthly normals
Warmest month Jul (avg high 89°F), coldest Jan (avg low 29°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 47 | 50 | 58 | 69 | 77 | 85 | 89 | 86 | 81 | 71 | 60 | 52 |
| Avg low °F | 29 | 30 | 37 | 46 | 55 | 65 | 70 | 68 | 62 | 50 | 40 | 33 |
| Precip in | 3.6 | 3.2 | 4.2 | 3.6 | 3.7 | 4.3 | 4.8 | 5.3 | 4.3 | 3.9 | 3.4 | 3.7 |
NOAA 1991–2020 climate normals from the nearest station: SALISBURY (7.6 mi) · NOAA NCEI
Places in ZIP 21810
- 1 post offices
- 1 places of worship
- 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