ZIP code · Waldorf · Maryland · United States

ZIP code 20604 — Waldorf

ZIP code 20604 serves Waldorf, Maryland.

Postal code: 20604
Single source Value from one source, not cross-checked.
City: Waldorf
County: Charles
State: Maryland
Country: United States
Coordinates: 38.5095, -76.9817 — precision precise (locality)
View on OpenStreetMap
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)
Area codes: 240, 301, 227
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 20604 with another ZIP · ZIPs within 25 miles · distance from 20604

Climate — monthly normals

Warmest month Jul (avg high 85°F), coldest Jan (avg low 25°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	44	48	56	67	74	82	85	83	77	66	57	48
Avg low °F	25	26	33	43	52	61	66	64	58	46	36	29
Precip in	3.3	3.0	4.2	3.3	4.3	4.2	4.6	4.8	4.9	4.2	3.3	4.0

NOAA 1991–2020 climate normals from the nearest station: MECHANICSVILLE 5 NE (13.9 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