Potosi is a city in Washington County, Missouri, home to about 2,544 people across 2.3 square miles. It has no ZIP code of its own: it’s part of 63660 and 63664.
Homes sold for a median of $129 per square foot across 2 ZIP codes in the three months ending August 2026, and 0 of 2 were seller’s markets.
Part is in Potosi, part in Mineral Point
Each card is that ZIP code’s whole market, including any part outside Potosi. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Potosi’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | St. Louis Lambert International Airport (STL)60 miles away |
|---|---|
| Nearest city of 250,000+ | St. Louis, MO57 miles away |
| Nearest city of 1 million+ | Chicago, IL316 miles away |
Straight-line distances from the center of Potosi; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Potosi had 2,538 residents in the 2020 census, down 5% since 2000.
It’s the 235th largest of 1,060 towns in Missouri by population.
Washington County grew from 14,263 residents in 1900 to 23,514 in 2020.
Washington County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 21°F. About 45.5 inches of rain and melted snow fall in a typical year, with about 12 inches of snow.
Source: NOAA 1991–2020 climate normals, Potosi 4 Sw, MO weather station (4 miles away).
3,263 jobs at 371 businesses in Washington County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
85 doctors and other health care providers list an office in Potosi’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 11 |
|---|---|
| Specialist doctors | 4 |
| Dentists | 8 |
| Nurse practitioners and physician assistants | 21 |
| Mental health providers | 34 |
| Optometrists | 2 |
| Chiropractors | 5 |
| Pharmacies | 5 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Grocery stores
Pharmacies
Libraries
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1826.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Potosi R-III, Mo Schls for the Sev Disabled. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Potosi Elem.Potosi | Pre-K–3 | 683 | Public | 2.6 mi |
| Citadel SchoolPotosi | K–12 | 4 | Special Education | 1.7 mi |
| Trojan IntermediatePotosi | 4–6 | 438 | Public | 1.4 mi |
| John A. Evans MiddlePotosi | 7–8 | 316 | Public | 1.5 mi |
| Potosi HighPotosi | 9–12 | 673 | Public | 1.6 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Mineral Point.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.