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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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Charles County ZIP Codes

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

County State ZIP Code City Area Codes
Charles County MD 20675 Pomfret 227, 240, 301
Charles County MD 20677 Port Tobacco 227, 240, 301
Charles County MD 20682 Rock Point 240
Charles County MD 20693 Welcome 227, 240, 301
Charles County MD 20695 White Plains 227, 240, 301
St. Charles County MO 63301 Saint Charles 314, 557, 618, 636
St. Charles County MO 63302 Saint Charles 636
St. Charles County MO 63303 Saint Charles 314, 557, 636
St. Charles County MO 63304 Saint Charles 636
St. Charles County MO 63332 Augusta 636
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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.