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U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

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Island County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Island County.

County State ZIP Code City Area Codes
Rock Island County IL 61299 Rock Island 309
Island County WA 98236 Clinton 360, 564
Island County WA 98239 Coupeville 360, 564
Island County WA 98249 Freeland 360, 564
Island County WA 98253 Greenbank 360, 564
Island County WA 98260 Langley 360, 564
Island County WA 98277 Oak Harbor 360, 564
Island County WA 98278 Oak Harbor 360, 564
Island County WA 98282 Camano Island 360, 564
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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.