Castalia, IA Demographics

A map of Castalia's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	142	124	100.0%	85.5%
Black	0	0	0.0%	0.0%
Asian	0	0	0.0%	0.0%
Hispanic	0	19	0.0%	13.1%
Native American/Other	0	0	0.0%	0.0%
Multiracial	0	2	0.0%	1.4%

Castalia, Iowa has an estimated population of 142, a slight decrease from the 145 recorded in the 2020 Census. The population is 100.0% White, 0.0% Black, 0.0% Asian, 0.0% Hispanic, 0.0% Native American/Other, and 0.0% Multiracial. This demographic dot map shows the population of Castalia, with one dot drawn for each person counted by the Census, color-coded by race.

Castalia has become considerably less racially diverse since the 2020 Census. It is considerably less diverse than Iowa overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Castalia, that probability was 25.1% in 2020 and 0.0% in the most recent ACS estimates.

Castalia is ranked the 781st most populous place in Iowa, out of 1,026 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). Castalia was ranked the 773rd most populous place in the 2020 Census.

Castalia's White Population

142 residents of Castalia, or 100.0% of the population, identify as White. The share of White residents in Castalia is significantly higher than in Iowa overall, where 82.3% of the population is White. Castalia ranks 890th statewide in terms of White residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Castalia's White population has grown by an estimated 14.5%. White residents' share of Castalia's population has increased from 85.5% to 100.0%.

Castalia is more White than neighboring Ossian (94.7% White), Postville (45.7% White), Clermont (98.1% White), Elgin (95.2% White), and Calmar (91.4% White).

Castalia's Black Population

0 residents of Castalia, or 0.0% of the population, identify as Black. The share of Black residents in Castalia is slightly lower than in Iowa overall, where 3.8% of the population is Black. Castalia ranks 600th statewide in terms of Black residents as a share of the population, out of 1,026 places.

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

Castalia is less Black than neighboring Postville (11% Black), and Elgin (0.7% Black).

Castalia's Asian Population

0 residents of Castalia, or 0.0% of the population, identify as Asian. The share of Asian residents in Castalia is slightly lower than in Iowa overall, where 2.5% of the population is Asian. Castalia ranks 543rd statewide in terms of Asian residents as a share of the population, out of 1,026 places.

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

Castalia is less Asian than neighboring Postville (0.3% Asian).

Castalia's Hispanic Population

0 residents of Castalia, or 0.0% of the population, identify as Hispanic. The share of Hispanic residents in Castalia is lower than in Iowa overall, where 7.3% of the population is Hispanic. Castalia ranks 56th statewide in terms of Hispanic residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Castalia's Hispanic population has declined by an estimated 100.0%. Hispanic residents' share of Castalia's population has decreased from 13.1% to 0.0%.

Castalia is less Hispanic than neighboring Ossian (4.1% Hispanic), Postville (42.5% Hispanic), Elgin (0.7% Hispanic), and Calmar (7.3% Hispanic).

Castalia's Native American/Other Population

0 residents of Castalia, 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 Castalia is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Castalia ranks 637th statewide in terms of Native American/Other residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Castalia's Native American/Other population has grown from 0 to an estimated 0. Native American/Other residents' share of Castalia's population has remained roughly unchanged at 0.0%.

Castalia's Multiracial Population

0 residents of Castalia, or 0.0% of the population, identify as Multiracial. The share of Multiracial residents in Castalia is slightly lower than in Iowa overall, where 3.5% of the population is Multiracial. Castalia ranks 843rd statewide in terms of Multiracial residents as a share of the population, out of 1,026 places.

Since the 2020 Census, Castalia's Multiracial population has declined by an estimated 100.0%. Multiracial residents' share of Castalia's population has decreased from 1.4% to 0.0%.

Castalia is less Multiracial than neighboring Ossian (1.2% Multiracial), Postville (0.5% Multiracial), Clermont (1.9% Multiracial), Elgin (3.4% Multiracial), and Calmar (1.3% 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.