Rio Oso is a community in Sutter County, California, home to about 437 people across 6.5 square miles. Its ZIP code is 95674.
Mostly Rio Oso; also Trowbridge
We’re writing up Rio Oso’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Sacramento International Airport (SMF)20 miles away |
|---|---|
| Nearest city of 250,000+ | Sacramento, CA28 miles away |
| Nearest city of 1 million+ | Los Angeles, CA382 miles away |
Straight-line distances from the center of Rio Oso; 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.
Rio Oso had 372 residents in the 2020 census, up 4% since 2010.
It’s the 1247th largest of 1,563 towns in California by population.
Sutter County grew from 5,886 residents in 1900 to 99,633 in 2020.
Sutter County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 96°F in summer, and winter lows average 38°F. About 20.1 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Marysville Yuba Co Ap, CA weather station (11 miles away).
23,969 jobs at 2,243 businesses in Sutter 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.
Grocery stores
Theaters and performance venues
Counts are within about 2 miles 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.
Public schools here are run by Browns Elementary. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Browns ElementaryRio Oso | K–8 | 143 | Public | 2.9 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 Trowbridge.
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.