Each edition grades its towns against each other only.
Home to 2 places on the National Register of Historic Places.
Its National Register listings include Armour Historic District and Douglas County Courthouse and Auditor's Office. Armour has fewer than 1,000 residents, too few for fair grades; the figures below are still real.
Where Armour beats most towns.
In a town this size, neighbors are the best guide. Ask them anything.
Census counts: 482 in 1890, a peak of 1,045 in 1920, 698 in 2020. The archive holds 8 old photos and papers going back to 1914 and 2 maps from 1979 on.
2 places on the National Register of Historic Places.
Who provides power, water and the rest in Armour, and how to reach them.
EPA SDWIS (Oct 9, 2026) · HIFLD + EIA-861 2025 · Census 2020 ZCTAs · NCES 2024–25 · registration: vote.gov, updated Aug 3, 2026.
Ordered by what stands out in Armour.
The typical July afternoon high for Armour comes to 87°F.
NOAA U.S. Climate Normals, 1991–2020
Two of the 3 schools are below, and why each made the list. The Armour School District 21-1 runs its public schools. Also worth knowing: the 3 public schools in Armour teach 226 students between them.
| School | Level | Students | Letter |
|---|---|---|---|
| Armour Elementary - 02Largest public elementary schoolGrades PK–5 | Grades PK–5 | 119 | C+ |
| Armour High School - 01Largest public high schoolGrades 9–12 | Grades 9–12 | 57 | B+ |
NCES · EDFacts
People 65 and older are 25% of residents (18% statewide); adults 18 to 34 are 16% of residents (22% statewide). The median age for Armour comes to 50.2 years, above both the South Dakota town median (39.5 years) and the median of U.S. towns (40.5 years). Population is up 4.6% here since 2020, to 725 by the Census Bureau’s 2025 estimate. College graduates make up 31% of adults 25 and older, against 32% across South Dakota.
| Armour | South Dakota towns | U.S. towns | |
|---|---|---|---|
| Median age | 50.2 years | 39.5 years | 40.5 years |
| Under 18 | 21% | 22% | 22% |
57% women, 43% men
About 74 men for every 100 women (the survey’s margin: ±5.3 points). Across South Dakota, 49.2% of residents are women.
| Armour | SD | U.S. | |
|---|---|---|---|
| Under 10 | 14.7% | 13.1% | 11.6% |
| 10 to 17 | 6.4% | 11.2% | 10.3% |
| 18 to 24 | 5.3% | 9.3% | 9.1% |
| 25 to 34 | 10.7% | 12.6% | 13.7% |
| 35 to 44 | 9.9% | 12.6% | 13.2% |
| 45 to 54 | 7.3% | 10.7% | 12.2% |
| 55 to 64 | 20.4% | 12.6% | 12.7% |
| 65 to 74 | 11% | 11% | 10.2% |
| 75 and older | 14.4% | 7% | 7% |
| No diploma | 9.7% | 6.8% | 10.4% |
| High school | 23.9% | 29% | 26% |
| Some college | 17.9% | 19.9% | 19.1% |
| Associate’s | 17.9% | 12.3% | 8.8% |
| Bachelor’s | 21.9% | 21.9% | 21.6% |
| Graduate | 8.7% | 10% | 14.1% |
Census population estimates, 2025 · U.S. Census Bureau · ACS 2020-2024 5-year estimates · in a town of 700, single groups can be off by several points
The risk rating from FEMA for Armour comes to 35 of 100, against 54 of 100 in South Dakota’s towns and 44 of 100 across U.S. towns. Federal disaster aid has reached households in Armour after 2 declared disasters, most recently in 2019. Of the losses FEMA expects here, 32% come from cold waves and 28% from inland flooding. Flood insurance has paid one claim here since 1997.
FEMA disaster declarations and aid · FEMA National Risk Index · OpenFEMA
For half of commuters, work is under 25 miles away. Armour had 315 jobs in 2023, down 42 from 2013. Most people who work leave Armour to do it: just 16% work in town. The top destinations are Corsica (13%), Mitchell (9%) and Sioux Falls (8%).
| Armour | South Dakota towns | U.S. towns | |
|---|---|---|---|
| Working residents who work in town | 16% | 29% | 8% |
| Average trip to work | 21 minutes | 17 minutes | 25 minutes |
| Below the poverty line | 11% | 9.5% | 9.6% |
| Median household income | $82,000 | $72,000 | $80,000 |
Census LEHD 2023 · ACS
Only 2 of the 36 South Dakota towns we compare have a higher share of adults who have diabetes than Armour. Among adults locally, 20% have been diagnosed with depression. Against the South Dakota average, Armour comes out ahead on 3 CDC measures out of 26, and behind on 9.
| Armour | South Dakota towns | U.S. towns | |
|---|---|---|---|
| High blood pressure (CDC PLACES) | 41% | 31% | 35% |
| Diabetes (CDC PLACES) | 15% | 10% | 12% |
| Binge drink (CDC PLACES) | 15% | 19% | 16% |
| Sleep under 7 hours (CDC PLACES) | 29% | 30% | 36% |
| What stands out | Armour | SD |
|---|---|---|
| Fewer binge drinkers | 15.2% | 18.8% |
| More adults treating high blood pressure | 82% | 75.9% |
| More adults with heart disease | 9.9% | 6.8% |
CDC PLACES 2025 · modeled estimates for adults · CMS · HRSA
None within 15 miles of Armour; the nearest are
About 2 of every 100 Armour residents are enrolled in college, against 5 across South Dakota.
2 places in Armour on the National Register of Historic Places.
8 notable people were born in Armour.
City in South Dakota, United States
Armour is a city in and the county seat of Douglas County, South Dakota, United States. The population was 698 at the 2020 census.
From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)
Short answers, built from the data on this page.
Armour has fewer than 1,000 residents, too few for fair grades; the figures below are still real. Home to 2 places on the National Register of Historic Places.
8 notable people were born here, including Emily St. James and John C. Flanagan.
