Castle Hill, CA Demographics

A map of Castle Hill's Population by Race

Castle Hill, California has an estimated population of 1,026, a large decrease from the 1,271 recorded in the 2020 Census. The population is 72.3% White, 15.7% Asian, 12.0% Multiracial, 0.0% Black, 0.0% Hispanic, and 0.0% Native American/Other. This demographic dot map shows the population of Castle Hill, with one dot drawn for each person counted by the Census, color-coded by race.

Castle Hill 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 Castle Hill, that probability was 45.1% in 2020 and 43.8% in the most recent ACS estimates.

Castle Hill is ranked the 1057th 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). Castle Hill was ranked the 1010th most populous place in the 2020 Census.

Castle Hill's White Population

742 residents of Castle Hill, or 72.3% of the population, identify as White. The share of White residents in Castle Hill is significantly higher than in California overall, where 33.8% of the population is White. Castle Hill ranks 505th statewide in terms of White residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Castle Hill's White population has declined by an estimated 19.4%. White residents' share of Castle Hill's population has remained roughly unchanged at 72.3%.

Castle Hill is more White than neighboring Saranap (57.6% White), and Walnut Creek (61.3% White). Castle Hill is less White than neighboring San Miguel CDP (Contra Costa County) (77.8% White), Acalanes Ridge (84.6% White), and Shell Ridge (85.9% White).

Castle Hill's Black Population

0 residents of Castle Hill, or 0.0% of the population, identify as Black. The share of Black residents in Castle Hill is lower than in California overall, where 5.2% of the population is Black. Castle Hill ranks 907th statewide in terms of Black residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Castle Hill's Black population has declined by an estimated 100.0%. Black residents' share of Castle Hill's population has decreased from 0.7% to 0.0%.

Castle Hill is less Black than neighboring Saranap (2% Black), San Miguel CDP (Contra Costa County) (0.4% Black), and Walnut Creek (1.8% Black).

Castle Hill's Asian Population

161 residents of Castle Hill, or 15.7% of the population, identify as Asian. The share of Asian residents in Castle Hill is comparable to the share in California overall, where 15.3% of the population is Asian. Castle Hill ranks 264th statewide in terms of Asian residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Castle Hill's Asian population has grown by an estimated 9.5%. Asian residents' share of Castle Hill's population has increased from 11.6% to 15.7%.

Castle Hill is more Asian than neighboring Saranap (11% Asian), San Miguel CDP (Contra Costa County) (5.2% Asian), Acalanes Ridge (6.7% Asian), and Shell Ridge (1.9% Asian). Castle Hill is less Asian than neighboring Walnut Creek (17.1% Asian).

Castle Hill's Hispanic Population

0 residents of Castle Hill, or 0.0% of the population, identify as Hispanic. The share of Hispanic residents in Castle Hill is significantly lower than in California overall, where 40.2% of the population is Hispanic. Castle Hill ranks 1432nd statewide in terms of Hispanic residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Castle Hill's Hispanic population has declined by an estimated 100.0%. Hispanic residents' share of Castle Hill's population has decreased from 7.2% to 0.0%.

Castle Hill is less Hispanic than neighboring Saranap (19.3% Hispanic), San Miguel CDP (Contra Costa County) (5.8% Hispanic), Walnut Creek (12.4% Hispanic), Acalanes Ridge (7.2% Hispanic), and Shell Ridge (10.2% Hispanic).

Castle Hill's Native American/Other Population

0 residents of Castle Hill, 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 Castle Hill is comparable to the share in California overall, where 1.2% of the population is Native American/Other. Castle Hill ranks 914th statewide in terms of Native American/Other residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Castle Hill's Native American/Other population has declined by an estimated 100.0%. Native American/Other residents' share of Castle Hill's population has decreased from 1.1% to 0.0%.

Castle Hill is less Native American/Other than neighboring Saranap (3.8% Native American/Other), Walnut Creek (1% Native American/Other), and Acalanes Ridge (0.2% Native American/Other).

Castle Hill's Multiracial Population

123 residents of Castle Hill, or 12.0% of the population, identify as Multiracial. The share of Multiracial residents in Castle Hill is higher than in California overall, where 4.4% of the population is Multiracial. Castle Hill ranks 267th statewide in terms of Multiracial residents as a share of the population, out of 1,618 places.

Since the 2020 Census, Castle Hill's Multiracial population has grown by an estimated 38.2%. Multiracial residents' share of Castle Hill's population has increased from 7.0% to 12.0%.

Castle Hill is more Multiracial than neighboring Saranap (6.3% Multiracial), San Miguel CDP (Contra Costa County) (10.8% Multiracial), Walnut Creek (6.5% Multiracial), Acalanes Ridge (1.4% Multiracial), and Shell Ridge (2% 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.