ZIP code · Annapolis · Maryland · United States

ZIP code 21404 — Annapolis

ZIP code 21404 serves Annapolis, Maryland.

Postal code: 21404
Single source Value from one source, not cross-checked.
City: Annapolis
County: Anne Arundel
State: Maryland
Country: United States
Coordinates: 38.9784, -76.4922 — precision precise (locality)
View on OpenStreetMap
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)
Area codes: 443, 410, 667
Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.

Tools: compare 21404 with another ZIP · ZIPs within 25 miles · distance from 21404

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 (1.3 mi) · NOAA NCEI

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 · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page