Rio Oso, California

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Rio Oso
census-designated place
Rio Oso is located in California
Rio Oso
Rio Oso
Position in California.
Coordinates: 38°57′06″N 121°31′52″W / 38.95167°N 121.53111°W / 38.95167; -121.53111Coordinates: 38°57′06″N 121°31′52″W / 38.95167°N 121.53111°W / 38.95167; -121.53111
Country  United States
State  California
County Sutter
 • Total 6.533 sq mi (16.920 km2)
 • Land 6.533 sq mi (16.920 km2)
 • Water 0 sq mi (0 km2)  0%
Elevation[2] 52 ft (16 m)
Population (2010)
 • Total 356
 • Density 54/sq mi (21/km2)
Time zone Pacific (PST) (UTC-8)
 • Summer (DST) PDT (UTC-7)
ZIP Code 95674
Area code(s) 530
GNIS feature ID 2583121
U.S. Geological Survey Geographic Names Information System: Rio Oso, California

Rio Oso is a census-designated place (CDP) in Sutter County, California.[2] Rio Oso sits at an elevation of 52 feet (16 m).[2] The ZIP Code is 95674. The community is inside area code 530. The 2010 United States census reported Rio Oso's population was 356.


According to the United States Census Bureau, the CDP covers an area of 6.5 square miles (16.9 km²), all of it land.


The 2010 United States Census[3] reported that Rio Oso had a population of 356. The population density was 54.5 people per square mile (21.0/km²). The racial makeup of Rio Oso was 274 (77.0%) White, 5 (1.4%) African American, 7 (2.0%) Native American, 26 (7.3%) Asian, 1 (0.3%) Pacific Islander, 32 (9.0%) from other races, and 11 (3.1%) from two or more races. Hispanic or Latino of any race were 53 persons (14.9%).

The Census reported that 356 people (100% of the population) lived in households, 0 (0%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.

There were 124 households, out of which 42 (33.9%) had children under the age of 18 living in them, 82 (66.1%) were opposite-sex married couples living together, 6 (4.8%) had a female householder with no husband present, 6 (4.8%) had a male householder with no wife present. There were 8 (6.5%) unmarried opposite-sex partnerships, and 0 (0%) same-sex married couples or partnerships. 21 households (16.9%) were made up of individuals and 8 (6.5%) had someone living alone who was 65 years of age or older. The average household size was 2.87. There were 94 families (75.8% of all households); the average family size was 3.28.

The population was spread out with 85 people (23.9%) under the age of 18, 15 people (4.2%) aged 18 to 24, 95 people (26.7%) aged 25 to 44, 106 people (29.8%) aged 45 to 64, and 55 people (15.4%) who were 65 years of age or older. The median age was 42.2 years. For every 100 females there were 103.4 males. For every 100 females age 18 and over, there were 103.8 males.

There were 140 housing units at an average density of 21.4 per square mile (8.3/km²), of which 95 (76.6%) were owner-occupied, and 29 (23.4%) were occupied by renters. The homeowner vacancy rate was 2.0%; the rental vacancy rate was 6.5%. 276 people (77.5% of the population) lived in owner-occupied housing units and 80 people (22.5%) lived in rental housing units.


In the state legislature, Rio Oso is located in the 4th Senate District, represented by Republican Doug LaMalfa, and in the 2nd Assembly District, represented by Republican Jim Nielsen.

Federally, Rio Oso is in California's 3rd congressional district, represented by Democrat John Garamendi.[4]


  1. ^ U.S. Census
  2. ^ a b c U.S. Geological Survey Geographic Names Information System: Rio Oso, California
  3. ^ All data are derived from the United States Census Bureau reports from the 2010 United States Census, and are accessible on-line here. The data on unmarried partnerships and same-sex married couples are from the Census report DEC_10_SF1_PCT15. All other housing and population data are from Census report DEC_10_DP_DPDP1. Both reports are viewable online or downloadable in a zip file containing a comma-delimited data file. The area data, from which densities are calculated, are available on-line here. Percentage totals may not add to 100% due to rounding. The Census Bureau defines families as a household containing one or more people related to the householder by birth, opposite-sex marriage, or adoption. People living in group quarters are tabulated by the Census Bureau as neither owners nor renters. For further details, see the text files accompanying the data files containing the Census reports mentioned above.
  4. ^ "California's 3rd Congressional District - Representatives & District Map". Civic Impulse, LLC. Retrieved March 1, 2013.