ZIP code · Annapolis · Maryland · United States
ZIP code 21405 — Annapolis
ZIP code 21405 serves Annapolis, Maryland.
- Postal code
- 21405Single source Value from one source, not cross-checked.
- City
- Annapolis
- County
- Anne Arundel FIPS 24003
- State
- Maryland
- Country
- United States
- Coordinates
- 39.0305, -76.5515 — precision precise (locality)
View on OpenStreetMap - Population
- 426 (ZCTA, ACS 5-year)
- Population density
- 416 / sq mi
- Land area
- 1 sq mi (2.7 km²) (ZCTA, ACS 5-year)
- Median household income
- $182,614
- Per-capita income
- $88,595
- Median age
- 61.9
- Households
- 197
- Housing units
- 309
- Median home value
- $944,000
- Congressional district
- MD-3 (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 21405 with another ZIP · ZIPs within 25 miles · distance from 21405
Map of ZIP code 21405
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 | 44 | 48 | 55 | 68 | 77 | 85 | 89 | 86 | 80 | 69 | 58 | 48 |
| Avg low °F | 29 | 31 | 38 | 48 | 57 | 67 | 71 | 70 | 65 | 52 | 41 | 34 |
NOAA 1991–2020 climate normals from the nearest station: ANNAPOLIS POLICE BRKS (3.5 mi) · NOAA NCEI
Places in ZIP 21405
- 1 post offices
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