ZIP code · Bethesda · Maryland · United States

ZIP code 20811 — Bethesda

ZIP code 20811 serves Bethesda, Maryland.

Postal code: 20811
Single source Value from one source, not cross-checked.
City: Bethesda
County: Montgomery
State: Maryland
Country: United States
Coordinates: 38.9806, -77.1008 — 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: 301, 240, 227 (from the nearest rate centre)
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 20811 with another ZIP · ZIPs within 25 miles · distance from 20811

Climate — monthly normals

Warmest month Jul (avg high 88°F), coldest Jan (avg low 26°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	43	46	55	68	76	84	88	86	79	68	56	47
Avg low °F	26	27	34	44	54	63	68	66	59	47	36	30
Precip in	3.3	3.2	4.2	3.5	4.4	4.2	5.1	4.4	4.5	4.4	3.3	3.8

NOAA 1991–2020 climate normals from the nearest station: DALECARLIA RSVR (3.0 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