ZIP code · Hillsboro · Maryland · United States
ZIP code 21641 — Hillsboro
ZIP code 21641 serves Hillsboro, Maryland.
- Postal code
- 21641Single source Value from one source, not cross-checked.
- City
- Hillsboro
- County
- Caroline FIPS 24011
- State
- Maryland
- Country
- United States
- Coordinates
- 38.9206, -75.9388 — precision precise (locality)
View on OpenStreetMap - Population
- 130 (ZCTA, ACS 5-year)
- Population density
- 962 / sq mi
- Land area
- 0.1 sq mi (0.4 km²) (ZCTA, ACS 5-year)
- Median household income
- $65,417
- Per-capita income
- $29,232
- Median age
- 53.5
- Households
- 61
- Housing units
- 81
- Median home value
- $241,700
- Median gross rent
- $955 / month
- 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 21641 with another ZIP · ZIPs within 25 miles · distance from 21641
Map of ZIP code 21641
Climate — monthly normals
Warmest month Jul (avg high 88°F), coldest Jan (avg low 29°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 45 | 47 | 56 | 67 | 75 | 84 | 88 | 86 | 80 | 69 | 58 | 49 |
| Avg low °F | 29 | 31 | 37 | 47 | 56 | 66 | 70 | 68 | 62 | 51 | 41 | 33 |
| Precip in | 3.5 | 3.1 | 4.4 | 3.7 | 4.0 | 4.0 | 4.3 | 4.8 | 4.2 | 4.4 | 3.4 | 3.9 |
NOAA 1991–2020 climate normals from the nearest station: ROYAL OAK 2 SSW (19.6 mi) · NOAA NCEI
Places in ZIP 21641
- 1 parks
- 1 playgrounds
- 2 post offices
- 2 places of worship
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