Seneca, KS Demographics

A map of Seneca's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	2,001	1,976	95.7%	92.4%
Hispanic	54	103	2.6%	4.8%
Native American/Other	27	5	1.3%	0.2%
Black	4	18	0.2%	0.8%
Multiracial	4	37	0.2%	1.7%
Asian	0	0	0.0%	0.0%

Seneca, Kansas has an estimated population of 2,090, a slight decrease from the 2,139 recorded in the 2020 Census. The population is 95.7% White, 2.6% Hispanic, 1.3% Native American/Other, 0.2% Black, 0.2% Multiracial, and 0.0% Asian. This demographic dot map shows the population of Seneca, with one dot drawn for each person counted by the Census, color-coded by race.

Seneca has become considerably less racially diverse since the 2020 Census. It is considerably less diverse than Kansas overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Seneca, that probability was 14.4% in 2020 and 8.3% in the most recent ACS estimates.

Seneca is ranked the 122nd most populous place in Kansas, out of 740 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). Seneca was ranked the 116th most populous place in the 2020 Census.

Seneca's White Population

2,001 residents of Seneca, or 95.7% of the population, identify as White. The share of White residents in Seneca is significantly higher than in Kansas overall, where 72.7% of the population is White. Seneca ranks 170th statewide in terms of White residents as a share of the population, out of 740 places.

Since the 2020 Census, Seneca's White population has grown by an estimated 1.3%. White residents' share of Seneca's population has increased from 92.4% to 95.7%.

Seneca is more White than neighboring Centralia (89.8% White), and Oneida (60.6% White). Seneca is less White than neighboring St. Benedict (100% White), Baileyville (100% White), and Kelly (100% White).

Seneca's Black Population

4 residents of Seneca, or 0.2% of the population, identify as Black. The share of Black residents in Seneca is slightly lower than in Kansas overall, where 5.2% of the population is Black. Seneca ranks 221st statewide in terms of Black residents as a share of the population, out of 740 places.

Since the 2020 Census, Seneca's Black population has declined by an estimated 77.8%. Black residents' share of Seneca's population has decreased from 0.8% to 0.2%.

Seneca is more Black than neighboring St. Benedict (0% Black), Baileyville (0% Black), and Kelly (0% Black). Seneca is less Black than neighboring Centralia (1.2% Black), and Oneida (2.9% Black).

Seneca's Asian Population

0 residents of Seneca, or 0.0% of the population, identify as Asian. The share of Asian residents in Seneca is slightly lower than in Kansas overall, where 2.9% of the population is Asian. Seneca ranks 354th statewide in terms of Asian residents as a share of the population, out of 740 places.

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

Seneca's Hispanic Population

54 residents of Seneca, or 2.6% of the population, identify as Hispanic. The share of Hispanic residents in Seneca is considerably lower than in Kansas overall, where 13.6% of the population is Hispanic. Seneca ranks 297th statewide in terms of Hispanic residents as a share of the population, out of 740 places.

Since the 2020 Census, Seneca's Hispanic population has declined by an estimated 47.6%. Hispanic residents' share of Seneca's population has decreased from 4.8% to 2.6%.

Seneca is more Hispanic than neighboring St. Benedict (0% Hispanic), Baileyville (0% Hispanic), Kelly (0% Hispanic), Centralia (2.4% Hispanic), and Oneida (0% Hispanic).

Seneca's Native American/Other Population

27 residents of Seneca, or 1.3% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Seneca is comparable to the share in Kansas overall, where 0.9% of the population is Native American/Other. Seneca ranks 510th statewide in terms of Native American/Other residents as a share of the population, out of 740 places.

Since the 2020 Census, Seneca's Native American/Other population has grown by an estimated 440.0%. Native American/Other residents' share of Seneca's population has increased from 0.2% to 1.3%.

Seneca is more Native American/Other than neighboring St. Benedict (0% Native American/Other), Baileyville (0% Native American/Other), Kelly (0% Native American/Other), and Oneida (0% Native American/Other). Seneca is less Native American/Other than neighboring Centralia (3.2% Native American/Other).

Seneca's Multiracial Population

4 residents of Seneca, or 0.2% of the population, identify as Multiracial. The share of Multiracial residents in Seneca is slightly lower than in Kansas overall, where 4.8% of the population is Multiracial. Seneca ranks 653rd statewide in terms of Multiracial residents as a share of the population, out of 740 places.

Since the 2020 Census, Seneca's Multiracial population has declined by an estimated 89.2%. Multiracial residents' share of Seneca's population has decreased from 1.7% to 0.2%.

Seneca is more Multiracial than neighboring St. Benedict (0% Multiracial), Baileyville (0% Multiracial), and Kelly (0% Multiracial). Seneca is less Multiracial than neighboring Centralia (3.4% Multiracial), and Oneida (36.5% 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.