Flandreau, South Dakota demographics

Flandreau, SD demographics: median age 38.5; 26.8% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Flandreau city, South Dakota · Incorporated city · GEOID 4621540. The survey estimates a population of 2,392 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Flandreau is 38.5 years, with a 90% margin of error of 3.6 years. There are 999 households (±92). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	38.5 ±3.6	38.0 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 2,392
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
Under 18	696 ±92	29.1% ±3.2 pp	24.2%	22.0%
18–34	406 ±81	17.0% ±3.1 pp	21.9%	22.8%
35–64	762 ±106	31.9% ±3.8 pp	35.9%	38.0%
65 and older	528 ±99	22.1% ±3.8 pp	18.0%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 2,392
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
Male	1,141 ±106	47.7% ±2.7 pp	50.8%	49.5%
Female	1,251 ±107	52.3% ±2.3 pp	49.2%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 2,392
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
White alone	1,380 ±165	57.7% ±5.4 pp	80.7%	61.0%
Black or African American alone	0 ±10 · low precision	0.0% ±0.4 pp · low precision	2.3%	12.2%
American Indian and Alaska Native alone	538 ±134	22.5% ±5.4 pp	7.5%	0.9%
Asian alone	108 ±43	4.5% ±1.8 pp	1.4%	6.0%
Native Hawaiian and Other Pacific Islander alone	3 ±5 · low precision	0.1% ±0.2 pp · low precision	0.0%	0.2%
Some other race alone	49 ±47 · low precision	2.0% ±2.0 pp · low precision	1.6%	7.1%
Two or more races	314 ±104	13.1% ±4.2 pp	6.5%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 2,392
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
Not Hispanic or Latino	2,213 ±176	92.5% ±2.8 pp	95.2%	80.7%
Hispanic or Latino	179 ±65	7.5% ±2.7 pp	4.8%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 999
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
Married-couple family	404 ±62	40.4% ±5.0 pp	48.3%	46.9%
Other family: male householder, no spouse present	88 ±42	8.8% ±4.1 pp	4.8%	5.1%
Other family: female householder, no spouse present	80 ±37	8.0% ±3.6 pp	8.1%	12.2%
Nonfamily: householder living alone	399 ±83	39.9% ±7.4 pp	31.9%	28.7%
Nonfamily: householder not living alone	28 ±24 · low precision	2.8% ±2.4 pp · low precision	6.8%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 999
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
Households with people under 18	320 ±50	32.0% ±4.0 pp	29.0%	29.5%
Households without people under 18	679 ±90	68.0% ±6.5 pp	71.0%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 999
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
One-person nonfamily households	399 ±83	39.9% ±7.4 pp	31.9%	28.7%
Two-person households	245 ±59	24.5% ±5.5 pp	35.5%	33.8%
Three-person households	115 ±48	11.5% ±4.7 pp	12.4%	15.3%
Four-person households	98 ±40	9.8% ±3.9 pp	10.5%	12.6%
Five-person households	91 ±35	9.1% ±3.4 pp	6.1%	5.9%
Six-person households	24 ±22 · low precision	2.4% ±2.2 pp · low precision	2.2%	2.2%
Seven or more people	27 ±20 · low precision	2.7% ±2.0 pp · low precision	1.5%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 2,392
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
Native	2,214 ±176	92.6% ±2.8 pp	96.0%	85.9%
Foreign born	178 ±65	7.4% ±2.7 pp	4.0%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 2,171
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
English only	1,961 ±171	90.3% ±3.7 pp	92.9%	77.7%
Spanish	103 ±42	4.7% ±1.9 pp	2.6%	13.6%
French, Haitian, or Cajun	0 ±10 · low precision	0.0% ±0.5 pp · low precision	0.1%	0.7%
German or other West Germanic	7 ±10 · low precision	0.3% ±0.5 pp · low precision	0.8%	0.5%
Russian, Polish, or other Slavic	0 ±10 · low precision	0.0% ±0.5 pp · low precision	0.4%	0.7%
Other Indo-European	5 ±7 · low precision	0.2% ±0.3 pp · low precision	0.4%	2.0%
Korean	0 ±10 · low precision	0.0% ±0.5 pp · low precision	0.1%	0.3%
Chinese, including Mandarin and Cantonese	0 ±10 · low precision	0.0% ±0.5 pp · low precision	0.1%	1.1%
Vietnamese	0 ±10 · low precision	0.0% ±0.5 pp · low precision	0.1%	0.5%
Tagalog, including Filipino	35 ±45 · low precision	1.6% ±2.1 pp · low precision	0.2%	0.6%
Other Asian and Pacific Island	26 ±27 · low precision	1.2% ±1.2 pp · low precision	0.4%	1.1%
Arabic	0 ±10 · low precision	0.0% ±0.5 pp · low precision	0.1%	0.5%
Other and unspecified	34 ±27 · low precision	1.6% ±1.2 pp · low precision	1.8%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 1,538
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
Less than high school graduate	128 ±60	8.3% ±3.8 pp	6.8%	10.4%
High school graduate or equivalency	500 ±103	32.5% ±6.1 pp	29.0%	26.0%
Some college, no degree	353 ±86	23.0% ±5.2 pp	19.9%	19.1%
Associate’s degree	145 ±55	9.4% ±3.5 pp	12.3%	8.8%
Bachelor’s degree	259 ±76	16.8% ±4.7 pp	21.9%	21.6%
Graduate or professional degree	153 ±50	9.9% ±3.1 pp	10.0%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 2,353
Category	Count ± MOE	Share ± MOE (pp)	South Dakota	U.S.
Same house	2,071 ±186	88.0% ±4.5 pp	87.0%	87.7%
Moved within same county	183 ±75	7.8% ±3.1 pp	5.7%	6.3%
Moved from a different county in the same state	90 ±53 · low precision	3.8% ±2.2 pp · low precision	3.7%	3.1%
Moved from a different state	3 ±4 · low precision	0.1% ±0.2 pp · low precision	3.2%	2.3%
Moved from abroad	6 ±7 · low precision	0.3% ±0.3 pp · low precision	0.3%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

16.0% of Flandreau residents (±3.0 percentage points) had no health insurance coverage when surveyed, compared with 9.0% in South Dakota and 8.4% nationally. 83.1% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Flandreau	South Dakota	U.S.	Compared with South Dakota
People without health insurance Civilian noninstitutionalized population	16.0% ±3.0 pp	9.0%	8.4%	Higher
Households with a broadband subscription Households	83.1% ±6.5 pp	89.6%	91.0%	Lower
Veterans Civilian population age 18 and older	7.3% ±2.0 pp	7.9%	6.2%	Not statistically different

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Flandreau . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Flandreau housing and cost context or return to the city profile.