ZIP code · Herndon · Virginia · United States

ZIP code 20172 — Herndon

ZIP code 20172 serves Herndon, Virginia.

Postal code: 20172
Single source Value from one source, not cross-checked.
City: Herndon
County: Fairfax
State: Virginia
Country: United States
Coordinates: 38.9696, -77.3861 — 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: 571, 703
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 20172 with another ZIP · ZIPs within 25 miles · distance from 20172

Climate — monthly normals

Warmest month Jul (avg high 88°F), coldest Jan (avg low 25°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	43	46	55	67	75	83	88	86	79	68	57	47
Avg low °F	25	27	34	43	53	62	67	65	58	45	36	29
Precip in	2.9	2.6	3.5	3.5	4.7	4.3	4.2	3.5	3.9	3.6	3.1	3.3

NOAA 1991–2020 climate normals from the nearest station: WASHINGTON DC DULLES AP (4.6 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