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U.S. ZIP Codes Database 2026

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San Juan County ZIP Codes

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

County State ZIP Code City Area Codes
San Juan County UT 84512 Bluff 435, 928
San Juan County UT 84530 La Sal 435, 970
San Juan County UT 84531 Mexican Hat 435, 928
San Juan County UT 84534 Montezuma Creek 435, 928, 970
San Juan County UT 84535 Monticello 435, 970
San Juan County UT 84536 Monument Valley 435, 928
San Juan County WA 98222 Blakely Island 360, 564
San Juan County WA 98243 Deer Harbor 360, 564
San Juan County WA 98245 Eastsound 360, 564
San Juan County WA 98250 Friday Harbor 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.