Portage Des Sioux is a city in St. Charles County, Missouri, home to about 340 people across 0.6 square miles. Its ZIP code is 63373.
Homes sold for a median of $90 per square foot in the three months ending August 2026, a buyer’s market.
Each card is that ZIP code’s whole market, including any part outside Portage Des Sioux. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Portage Des Sioux’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)12 miles away |
|---|---|
| Nearest city of 250,000+ | St. Louis, MO21 miles away |
| Nearest city of 1 million+ | Chicago, IL246 miles away |
Straight-line distances from the center of Portage Des Sioux; 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.
Portage Des Sioux had 335 residents in the 2020 census, down 5% since 2000.
It’s the 610th largest of 1,060 towns in Missouri by population.
St. Charles County grew from 24,474 residents in 1900 to 405,262 in 2020.
St. Charles County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 89°F in summer, and winter lows average 22°F. About 39.6 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, St Charles Co Ap, MO weather station (2 miles away).
143,624 jobs at 8,946 businesses in St. Charles County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
Libraries
Museums
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.
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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.