ZIP code · Blaine · Washington · United States

ZIP code 98231 — Blaine

ZIP code 98231 serves Blaine, Washington.

Postal code: 98231
Single source Value from one source, not cross-checked.
City: Blaine
County: Whatcom
State: Washington
Country: United States
Coordinates: 48.9937, -122.7471 — precision precise (locality)
View on OpenStreetMap
USDA hardiness zone: 8b (15 to 20 °F)
Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
Time zone: America/Los_Angeles (UTC−8 / UTC−7 DST)
Area codes: 360, 564 (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 98231 with another ZIP · ZIPs within 25 miles · distance from 98231

Climate — monthly normals

Warmest month Jul (avg high 73°F), coldest Jan (avg low 34°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	45	48	52	58	64	69	73	73	67	57	50	44
Avg low °F	34	35	38	42	47	52	55	55	50	44	38	34
Precip in	6.2	3.4	4.2	3.0	2.6	1.9	1.1	1.1	2.2	4.4	6.1	5.6

NOAA 1991–2020 climate normals from the nearest station: BLAINE (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