ZIP code · Dulles · Virginia · United States

ZIP code 20103 — Dulles

ZIP code 20103 serves Dulles, Virginia.

Postal code: 20103
Single source Value from one source, not cross-checked.
City: Dulles
County: Loudoun
State: Virginia
Country: United States
Coordinates: 38.9962, -77.4500 — precision precise (locality)
View on OpenStreetMap
USDA hardiness zone: 7a (0 to 5 °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: 703, 571
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 20103 with another ZIP · ZIPs within 25 miles · distance from 20103

Climate — monthly normals

Warmest month Jul (avg high 87°F), coldest Jan (avg low 25°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	42	45	54	66	74	83	87	86	79	68	56	46
Avg low °F	25	26	33	43	53	63	67	66	58	45	35	29
Precip in	3.1	2.6	3.8	3.5	4.9	4.6	4.1	3.6	4.1	4.0	3.2	3.5

NOAA 1991–2020 climate normals from the nearest station: WFO STERLING (2.4 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