Postal reference / United States

63664Potosi, Missouri

ZIP code 63664 is a United States postal code for Potosi, Missouri. Its county association is Washington County. The map reference point is at 37.9549, -90.8415.

State / territory: Missouri
Recorded place name: Potosi
County association: Washington
Estimated coordinate: 37.9549, -90.8415
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ZIP prefix: 636 · 37 ZIP codes share it
Data source: GeoNames postal reference, snapshot September 26, 2026

GeoNames reference data. County associations may not include every intersecting county, place names are postal names rather than legal boundaries, and coordinates are approximate. This is not address validation.

Area

Land area: 287.666 sq mi (2023 Census Gazetteer)

Figures are for the ZIP Code Tabulation Area (ZCTA) that most closely matches this ZIP code, not an exact match to USPS delivery boundaries. Source: U.S. Census Bureau, 2023 Gazetteer + 2023 ACS 5-Year Estimates, retrieved 2026-09-27. How to read this data.

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Nearby ZIP code reference points

ZIP code	Place	State	County association	Miles
63630	Cadet	MO	Washington	6.6
63660	Mineral Point	MO	Washington	7.2
63674	Tiff	MO	Washington	11.2
63622	Belgrade	MO	Washington	11.5
63648	Irondale	MO	Washington	11.7
63071	Richwoods	MO	Washington	13.5
63626	Blackwell	MO	St. Francois	13.5
63631	Caledonia	MO	Washington	14.3

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