Castlewood, SD Demographics

A map of Castlewood's Population by Race

Castlewood, South Dakota has an estimated population of 804, a large increase from the 698 recorded in the 2020 Census. The population is 90.8% White, 6.8% Multiracial, 1.2% Native American/Other, 0.6% Black, 0.5% Hispanic, and 0.0% Asian. This demographic dot map shows the population of Castlewood, with one dot drawn for each person counted by the Census, color-coded by race.

Castlewood has become more racially diverse since the 2020 Census. It is considerably less diverse than South Dakota overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Castlewood, that probability was 15.9% in 2020 and 17.1% in the most recent ACS estimates.

Castlewood is ranked the 101st most populous place in South Dakota, out of 485 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). Castlewood was ranked the 107th most populous place in the 2020 Census.

Castlewood's White Population

730 residents of Castlewood, or 90.8% of the population, identify as White. The share of White residents in Castlewood is considerably higher than in South Dakota overall, where 79.8% of the population is White. Castlewood ranks 202nd statewide in terms of White residents as a share of the population, out of 485 places.

Since the 2020 Census, Castlewood's White population has grown by an estimated 14.2%. White residents' share of Castlewood's population has decreased from 91.5% to 90.8%.

Castlewood is more White than neighboring Claremont Colony (0% White), Poinsett Colony (0% White), Hayti (77% White), and Estelline (80.5% White). Castlewood is less White than neighboring Lake Poinsett (94% White).

Castlewood's Black Population

5 residents of Castlewood, or 0.6% of the population, identify as Black. The share of Black residents in Castlewood is comparable to the share in South Dakota overall, where 2.1% of the population is Black. Castlewood ranks 168th statewide in terms of Black residents as a share of the population, out of 485 places.

Since the 2020 Census, Castlewood's Black population has grown by an estimated 400.0%. Black residents' share of Castlewood's population has increased from 0.1% to 0.6%.

Castlewood is more Black than neighboring Claremont Colony (0% Black), Poinsett Colony (0% Black), Lake Poinsett (0% Black), Hayti (0% Black), and Estelline (0.5% Black).

Castlewood's Asian Population

0 residents of Castlewood, or 0.0% of the population, identify as Asian. The share of Asian residents in Castlewood is comparable to the share in South Dakota overall, where 1.4% of the population is Asian. Castlewood ranks 176th statewide in terms of Asian residents as a share of the population, out of 485 places.

Since the 2020 Census, Castlewood's Asian population has grown from 0 to an estimated 0. Asian residents' share of Castlewood's population has remained roughly unchanged at 0.0%.

Castlewood is less Asian than neighboring Lake Poinsett (1.4% Asian), and Estelline (0.5% Asian).

Castlewood's Hispanic Population

4 residents of Castlewood, or 0.5% of the population, identify as Hispanic. The share of Hispanic residents in Castlewood is slightly lower than in South Dakota overall, where 4.8% of the population is Hispanic. Castlewood ranks 129th statewide in terms of Hispanic residents as a share of the population, out of 485 places.

Since the 2020 Census, Castlewood's Hispanic population has declined by an estimated 85.7%. Hispanic residents' share of Castlewood's population has decreased from 4.0% to 0.5%.

Castlewood is more Hispanic than neighboring Claremont Colony (0% Hispanic), Poinsett Colony (0% Hispanic), and Lake Poinsett (0% Hispanic). Castlewood is less Hispanic than neighboring Hayti (23% Hispanic), and Estelline (12.9% Hispanic).

Castlewood's Native American/Other Population

10 residents of Castlewood, or 1.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Castlewood is lower than in South Dakota overall, where 7.5% of the population is Native American/Other. Castlewood ranks 217th statewide in terms of Native American/Other residents as a share of the population, out of 485 places.

Since the 2020 Census, Castlewood's Native American/Other population has declined by an estimated 23.1%. Native American/Other residents' share of Castlewood's population has decreased from 1.9% to 1.2%.

Castlewood is more Native American/Other than neighboring Claremont Colony (0% Native American/Other), Poinsett Colony (0% Native American/Other), Lake Poinsett (0% Native American/Other), Hayti (0% Native American/Other), and Estelline (0.4% Native American/Other).

Castlewood's Multiracial Population

55 residents of Castlewood, or 6.8% of the population, identify as Multiracial. The share of Multiracial residents in Castlewood is slightly higher than in South Dakota overall, where 4.4% of the population is Multiracial. Castlewood ranks 271st statewide in terms of Multiracial residents as a share of the population, out of 485 places.

Since the 2020 Census, Castlewood's Multiracial population has grown by an estimated 223.5%. Multiracial residents' share of Castlewood's population has increased from 2.4% to 6.8%.

Castlewood is more Multiracial than neighboring Claremont Colony (0% Multiracial), Poinsett Colony (0% Multiracial), Lake Poinsett (4.6% Multiracial), Hayti (0% Multiracial), and Estelline (5.3% 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.