Arlington: Demographics & People
Arlington is home to 920 people, in 392 households. Population grew 10.4% from 833 (2022) to 920 (2024). Median age 40.1 years. (2.0y younger than Kingsbury County; 3.7y older than South Dakota). Children under 18 are 26% of the population. Population is 85% White (non-Hispanic) and 10% Hispanic or Latino. 63% of households are family-led. County is losing 332 residents per year (2022-2023). County health: 38% adult obesity, 13% smoke.
- 2.3 people per household (vs South Dakota avg 2.4).
- 37% non-family households (singles, roommates) (vs South Dakota 44%).
- 93 dependents per 100 working-age (youth + seniors / 18-64) (vs South Dakota 73).
Population & Trend
Population grew 10.4% from 833 (2022) to 920 (2024) — about 17.4× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~1,018 (extrapolated at 5.2%/yr trend). Census Bureau Vintage estimate: 1,159.
| Census data vintage | 2024 |
|---|---|
| Population | 34,375 people |
| Annual growth rate · Population change | 10.4% |
| Annual growth rate · Population (2022) | 833 |
| Annual growth rate · Population (2024) | 920 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | booming |
| Population | 920 people (vs South Dakota 15,649) |
| Population Estimate | 1,159 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 40.1y is 1.2 years older than the U.S. median (38.9y). Children under 18 make up 26% — above the U.S. share of ~22%.
| Age Summary · Median age | 40.1 years (vs South Dakota 36.4y) |
|---|---|
| Age Summary · Children Pct | 25.8% |
| Age Summary · Character | established |
| Age Summary · Total Pop | 920 |
| Age Summary · Under 18 | 237 |
| Age Summary · 18 To 34 | 178.0× |
| Age Summary · 35 To 64 | 298.0× |
| Age Summary · 65 Plus | 207 |
| Population under 18 | 237 |
| Median age | 40.1 years (vs South Dakota 36.4y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 920 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| White residents | 824 |
|---|---|
| Hispanic or Latino residents | 10 |
| Diversity Index · Simpson Index | 18.9% |
| Diversity Index · Interpretation | less diverse |
| Asian population | 2.0% (vs South Dakota 1.3%) |
| Hispanic or Latino population | 9.6% (vs South Dakota 6.1%) |
| White (non-Hispanic) population | 84.6% (vs South Dakota 78.0%) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Ancestry
Self-reported ancestry from Census ACS — what residents report as their ethnic origin, separate from race. Counts can exceed population because people can list multiple ancestries.
Top (7)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 658 |
|---|---|
| Residents born in another state | 241 |
| Share born in this state | 71.5% |
| Share born in another state | 28.5% |
| Native-born U.S. citizens | 26.2% |
| Naturalized citizens | 2.3% |
| Total foreign-born residents | 3 |
Households & Family Composition
392 households. Averaging 2.2 people each — smaller than the U.S. average of 2.5. 63% are family households — near the U.S. share of ~65%. Of 233 families, 29% are married couples with children.
| Children under 18 | 180 |
|---|---|
| Total families | 233 |
| Married couples with children | 68 |
| Single-parent households | 15 |
| Average household size | 2.21 |
| Women who gave birth (past year) | 13.1% |
| Grandparents living with grandchildren | 113 |
| Grandparents responsible for grandchildren | 41 |
| Family households | 248 households (vs South Dakota 3,864) |
| Households that are families | 63.3% (vs South Dakota 56.4%) |
| Total households | 392 households (vs South Dakota 7,305) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 16.2% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 332 residents per year on net (IRS migration data).
| Moved within the county (past year) | 16.2% |
|---|---|
| Migration · People moving in (annual) | 30,399 |
| Migration · People moving out (annual) | 30,731 |
| Migration · Net migration (in − out) | -332 |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Disability
Census ACS measures self-reported functional limitations — vision, hearing, mobility, cognitive, self-care, or independent-living. The U.S. baseline disability rate is about 12–13%; rates trend higher with median age.
| Residents with a disability | 45 |
|---|---|
| Disability rate | 5.6% |
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 31 residents live in group quarters (3.4% of population).
| Living in group quarters | 31 |
|---|
Other
| Congressional District · Congress | 118th |
|---|---|
| Cdc Birth Rate · Fips | 46011 |
| Cdc Birth Rate · State Fips | 46 |
| Cdc Birth Rate · County Fips | 011 |
| Cdc Birth Rate · County | Brookings |
| Cdc Birth Rate · Birth Rate | 5.8% |
| Cdc Birth Rate · Lower Ci | 4.40 |
| Cdc Birth Rate · Upper Ci | 7.40 |
| Cdc Mortality · Fips | 46011 |
| Cdc Mortality · County | Brookings County |
| Cdc Mortality · Urban Rural | Micropolitan |
| Cdc Mortality · Total Deaths 2020 2023 | 646 |
| Cdc Vaccination · Fips | 46011 |
| Cdc Vaccination · County | Brookings County |
| Cdc Vaccination · Dose1 Pop Pct | 66.0% |
| Cdc Vaccination · Series Complete Pct | 54.8% |
| Cdc Vaccination · Booster Pct | 52.7% |
| Cdc Vaccination · Population 2019 | 35,077 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 5.30 |
| Family Score · Schools | 8 |
| Family Score · Childcare Centers | 1 |
| Family Score · Children Pct | 25.8% |
| Family Score · Rating | good |
| Town Summary · Key Facts | population 920, booming, established, middle-class, mixed |
| Town Summary · Population | 920 people (vs South Dakota 15,649) |
| Town Summary · County | Brookings County |
Sources: NCES school congressional district assignment · federal dataset cascade