Colorado ZIP Finder

Find ZIP codes by county or city for mailing outreach.

    Search for a Colorado county (e.g. "Boulder County") or city (e.g. "Fort Collins") to see matching ZIP codes.

    ZIP codes shown are ZCTAs — Census approximations of USPS delivery areas. Boundaries may not match exactly.

    ZCTA Coverage
    90–100%
    70–90%
    50–70%
    30–50%
    10–30%

    Coverage = fraction of ZCTA area inside selected boundary.

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    Detail by ZCTA:
    ZIP ZCTA Coverage ▾ Area Coverage Type