ZIP code · Madison · Maryland · United States
ZIP code 21648 — Madison
ZIP code 21648 serves Madison, Maryland.
- Postal code
- 21648Single source Value from one source, not cross-checked.
- City
- Madison
- County
- Dorchester FIPS 24019
- State
- Maryland
- Country
- United States
- Coordinates
- 38.4782, -76.2412 — precision precise (locality)
View on OpenStreetMap - Population
- 104 (ZCTA, ACS 5-year)
- Population density
- 11 / sq mi
- Land area
- 9.4 sq mi (24.3 km²) (ZCTA, ACS 5-year)
- Per-capita income
- $46,214
- Median age
- 61.7
- Households
- 40
- Housing units
- 58
- Median home value
- $171,200
- Congressional district
- MD-1 (119th Congress)
- USDA hardiness zone
- 8a (10 to 15 °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 21648 with another ZIP · ZIPs within 25 miles · distance from 21648
Map of ZIP code 21648
Climate — monthly normals
Warmest month Jul (avg high 87°F), coldest Jan (avg low 30°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 45 | 48 | 55 | 66 | 75 | 83 | 87 | 85 | 79 | 69 | 58 | 50 |
| Avg low °F | 30 | 31 | 37 | 47 | 57 | 66 | 71 | 69 | 63 | 52 | 41 | 34 |
| Precip in | 2.9 | 2.8 | 4.0 | 3.7 | 3.7 | 4.3 | 4.5 | 4.7 | 4.2 | 4.0 | 3.1 | 3.5 |
NOAA 1991–2020 climate normals from the nearest station: PATUXENT RIVER NAS (15.5 mi) · NOAA NCEI
Places in ZIP 21648
- 1 restaurants & cafés
- 2 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