Rio Oso, CA Demographics

A map of Rio Oso's Population by Race

Rio Oso, California has an estimated population of 437, a large increase from the 372 recorded in the 2020 Census. The population is 73.5% White, 10.3% Asian, 10.3% Hispanic, 4.3% Multiracial, 1.6% Black, and 0.0% Native American/Other. This demographic dot map shows the population of Rio Oso, with one dot drawn for each person counted by the Census, color-coded by race.

Rio Oso has become less racially diverse since the 2020 Census. It is considerably less diverse than California overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Rio Oso, that probability was 47.3% in 2020 and 43.7% in the most recent ACS estimates.

Rio Oso is ranked the 1249th most populous place in California, out of 1,618 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Rio Oso was ranked the 1273rd most populous place in the 2020 Census.

Rio Oso's White Population

321 residents of Rio Oso, or 73.5% of the population, identify as White. The share of White residents in Rio Oso is significantly higher than in California overall, where 33.8% of the population is White. Rio Oso ranks 567th statewide in terms of White residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Rio Oso's White population has grown by an estimated 23.0%. White residents' share of Rio Oso's population has increased from 70.2% to 73.5%.

Rio Oso is more White than neighboring Plumas Lake (52.4% White), and Olivehurst (39.9% White). Rio Oso is less White than neighboring Trowbridge (78.6% White), East Nicolaus (75.5% White), and Nicolaus (81.4% White).

Rio Oso's Black Population

7 residents of Rio Oso, or 1.6% of the population, identify as Black. The share of Black residents in Rio Oso is slightly lower than in California overall, where 5.2% of the population is Black. Rio Oso ranks 414th statewide in terms of Black residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Rio Oso's Black population has declined by an estimated 12.5%. Black residents' share of Rio Oso's population has decreased from 2.2% to 1.6%.

Rio Oso is more Black than neighboring Trowbridge (0% Black), East Nicolaus (0% Black), and Nicolaus (0% Black). Rio Oso is less Black than neighboring Plumas Lake (6.8% Black), and Olivehurst (5.1% Black).

Rio Oso's Asian Population

45 residents of Rio Oso, or 10.3% of the population, identify as Asian. The share of Asian residents in Rio Oso is slightly lower than in California overall, where 15.3% of the population is Asian. Rio Oso ranks 803rd statewide in terms of Asian residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Rio Oso's Asian population has grown by an estimated 462.5%. Asian residents' share of Rio Oso's population has increased from 2.2% to 10.3%.

Rio Oso is more Asian than neighboring Trowbridge (0% Asian), East Nicolaus (0% Asian), Plumas Lake (6.4% Asian), Nicolaus (2.9% Asian), and Olivehurst (8.9% Asian).

Rio Oso's Hispanic Population

45 residents of Rio Oso, or 10.3% of the population, identify as Hispanic. The share of Hispanic residents in Rio Oso is significantly lower than in California overall, where 40.2% of the population is Hispanic. Rio Oso ranks 988th statewide in terms of Hispanic residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Rio Oso's Hispanic population has declined by an estimated 26.2%. Hispanic residents' share of Rio Oso's population has decreased from 16.4% to 10.3%.

Rio Oso is more Hispanic than neighboring Trowbridge (3.3% Hispanic). Rio Oso is less Hispanic than neighboring East Nicolaus (16.4% Hispanic), Plumas Lake (25.7% Hispanic), Nicolaus (14.7% Hispanic), and Olivehurst (41.1% Hispanic).

Rio Oso's Native American/Other Population

0 residents of Rio Oso, or 0.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Rio Oso is comparable to the share in California overall, where 1.2% of the population is Native American/Other. Rio Oso ranks 1212th statewide in terms of Native American/Other residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Rio Oso's Native American/Other population has declined by an estimated 100.0%. Native American/Other residents' share of Rio Oso's population has decreased from 0.8% to 0.0%.

Rio Oso is less Native American/Other than neighboring Plumas Lake (3% Native American/Other), and Olivehurst (1.2% Native American/Other).

Rio Oso's Multiracial Population

19 residents of Rio Oso, or 4.3% of the population, identify as Multiracial. The share of Multiracial residents in Rio Oso is comparable to the share in California overall, where 4.4% of the population is Multiracial. Rio Oso ranks 105th statewide in terms of Multiracial residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Rio Oso's Multiracial population has declined by an estimated 38.7%. Multiracial residents' share of Rio Oso's population has decreased from 8.3% to 4.3%.

Rio Oso is more Multiracial than neighboring Nicolaus (1% Multiracial), and Olivehurst (3.8% Multiracial). Rio Oso is less Multiracial than neighboring Trowbridge (18.1% Multiracial), East Nicolaus (8.2% Multiracial), and Plumas Lake (5.7% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.