Rio Oso, CA Profile: Facts & Data

The Rio Oso CDP⁽¹⁾ had a population of 335 as of July 1, 2025. Rio Oso ranks in the lower quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in California. See peer rankings below.

The primary coordinate point for Rio Oso is located at latitude 38.961 and longitude -121.5444 in Sutter County. The formal boundaries for the Rio Oso Census Designated Place encompass a land area of 6.53 sq. miles and a water area of 0 sq. miles. Sutter County is in the Pacific time zone (GMT -8).

The Rio Oso Census Designated Place has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

California is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The Rio Oso Census Designated Place is located within South Sutter CCD of Sutter County.

A Census Designated Place (CDP) is a statistical counterpart to a self-governing (incorporated) place such as a city, town, or village. A CDP is not a legal entity and has no governmental functions.

Rio Oso, CA Data & Demographics (As of July 1, 2025)

POPULATION
Total Population	335 (100%)
Population in Households	335 (100.0%)
Population in Families	285 (85.1%)
Population in Group Quarters¹	0
Population Density	52
Diversity Index²	71


INCOME
Median Household Income	$114,574
Average Household Income	$130,169
% of Income for Mortgage⁴	31%
Per Capita Income	$47,405
Wealth Index⁵	116
Socioeconomic Status Index⁶	Moderate (46.9)

HOUSING
Total HU (Housing Units)	140 (100%)
Owner Occupied HU	77 (55.0%)
Renter Occupied HU	45 (32.1%)
Vacant Housing Units	18 (12.9%)
Median Home Value	$568,750
Average Home Value	$654,448
Housing Affordability Index³	77

HOUSEHOLDS
Total Households	122
Average Household Size	2.75
Family Households	82
Average Family Size	3.00

NOTES

Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

Rio Oso, CA - Peer Comparisons by Rank and Percentile

The table below compares Rio Oso to the other 1,618 incorporated cities, towns and CDPs in California by rank and percentile using July 1, 2025 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

GROWTH RATE / YEAR	2020-2025	2025-2030
Population	-1.98%	-0.48%
Households	-0.76%	-0.16%
Families		-0.49%
Median Household Income		-0.77%
Per Capita Income		1.77%
Owner Occupied HU		2.00%

Variable Description	Rank	Percentile
Total Population	# 1292	20th
Population Density	# 1467	9th
Median Household Income	# 408	75th
Housing Affordability Index	# 1396	86th
Per Capita Income	# 662	59th
Diversity Index	# 762	53rd

Rio Oso, CA Profile: Facts & Data

Rio Oso, California - Basic Facts

Rio Oso, CA Data & Demographics (As of July 1, 2025)

POPULATION

INCOME

HOUSING

HOUSEHOLDS

GROWTH RATE / YEAR

Rio Oso, CA - Peer Comparisons by Rank and Percentile

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Sutter County