Gregory County, South Dakota Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 40th-largest in South Dakota
The population of Gregory County, South Dakota is 3,993 as of the 2023 American Community Survey, making it the 40th-largest county in South Dakota. The median household income is $52,432, the median home value is $129,000, and the median age is 45.7.
The population of Gregory County has declined 3.7% since 2010 (4,270 → 4,110), a -0.27% annualized rate.
3,993
Population
-0.27%
Annual growth
4
People / sq mi
$52,432
Median Income
$129,000
Median Home Value
Gregory County covers 1,015 sq mi of land at 3.9 people per square mile.
About Gregory County, SD
What distinguishes Gregory County is density: among the most sparsely settled of US counties, around 4 people per square mile. With 3,993 residents, Gregory County is a county in South Dakota. It ranks #40 among counties in South Dakota by population.
Incomes run on the lower side: a median household income of $52,432, below the US median of $78,538. The poverty rate, 6.9%, is on the lower side for US counties and below the national 12.4%. Homes are comparatively cheap — a median value of $129,000, with typical rent around $614.
20.9% of adults 25 and older hold a bachelor’s degree, below the national average of 35.0%. Remote work is below the national 14.0% at 7.2%, and the average commute runs about 17 minutes each way.
Gregory County Population History (2010-2024)
The county of Gregory County had a population of 4,270 in 2010 and 4,110 in 2024, a -3.7% growth over 14 years. The peak was 4,270 in 2010. Average annual growth rate: -0.26%.
4,110
Population (2024)
4,270
Population (2010)
4,270
Peak (2010)
-0.26%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 4,270 |
| 2011 | 4,223 |
| 2012 | 4,247 |
| 2013 | 4,234 |
| 2014 | 4,227 |
| 2015 | 4,195 |
| 2016 | 4,157 |
| 2017 | 4,207 |
| 2018 | 4,197 |
| 2019 | 4,183 |
| 2020 | 4,000 |
| 2021 | 3,954 |
| 2022 | 3,993 |
| 2023 | 4,023 |
| 2024 | 4,110 |
Race & Ethnicity
| White | 87.4% |
| Black or African American | 1.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 9.8% |
| Two or More Races | 0.0% |
Age & Sex
45.7
Median Age
48.9%
Female
51.1%
Male
25.8%
Age 65+
Age Distribution
Children (under 15): 19.0% · Seniors (65+): 25.8%
Income & Poverty
| Median household income | $52,432$-19,989 vs state |
| Mean household income | $73,414 |
| Per-capita income | $32,510 |
| Poverty rate | 6.9%-0.5% vs state |
| Unemployment rate | 2.0% |
| Employment-to-population | 63.3% |
Top Industries by Employment
The largest employment sector in Gregory County is professional & business services, accounting for 24.8% of workers.
How residents commute
0.0%
Drive alone
4.6%
Carpool
77.3%
Public transit
7.2%
Work from home
16.5 min
Avg commute
Housing
$129,000$-107,800 vs state
Median home value
$614
Median rent
78.3%
Homeownership rate
2,199
Total housing units
74.4%
Occupied
25.6%
Vacant
21.7%
Renter-occupied
Social & access
92.1%
With health insurance
86.9%
With broadband internet
19.4%
Foreign-born
6.9%
Veterans (18+)
12.6%
With a disability
98.5%
Speak language other than English at home
Education
91.4%
High School+
20.9%
Bachelor's+
Largest cities in South Dakota
Other counties in South Dakota
Part of South Dakota
Metro areas in South Dakota
County rankings
Frequently Asked Questions
Gregory County, South Dakota has a population of 3,993 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 40th-largest county in South Dakota. Population density is 4 people per square mile.
The population of Gregory County has declined 3.7% since 2010 (4,270 → 4,110), a -0.27% annualized rate.
The median household income in Gregory County, South Dakota is $52,432, with mean (average) household income of $73,414 and per-capita income of $32,510. 6.9% of residents live below the federal poverty level.
In Gregory County, the largest racial and ethnic groups are White (87.4%), Hispanic or Latino (9.8%), Black or African American (1.0%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Gregory County, South Dakota is 45.7 years. Residents are 48.9% female and 51.1% male.
The median home value in Gregory County is $129,000 and median monthly rent is $614. 78.3% of occupied housing units are owner-occupied. The county has 2,199 total housing units, 25.6% of which are vacant.
The largest employment sector in Gregory County, South Dakota is professional, scientific, and management services, employing 24.8% of workers. The unemployment rate is 2.0%.
Sioux Falls is among the largest cities associated with Gregory County, South Dakota, with a population of 197,642.
Gregory County, SD Climate
Gregory County, SD has an average annual temperature of 8.8°C (48°F) and receives about 615 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
8.8°C
Avg Temp
615
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -7° / 20° | 12 mm |
| February | -3° / 26° | 16 mm |
| March | 2° / 35° | 46 mm |
| April | 8° / 47° | 70 mm |
| May | 15° / 59° | 93 mm |
| June | 20° / 69° | 93 mm |
| July | 24° / 74° | 81 mm |
| August | 23° / 73° | 61 mm |
| September | 17° / 63° | 64 mm |
| October | 10° / 51° | 40 mm |
| November | 1° / 34° | 24 mm |
| December | -5° / 24° | 15 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Gregory County, SD
The most comfortable months to visit Gregory County, SD are typically August, June and July, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 31°C high). The coldest is January (near -13°C low). May is usually the wettest month.
Where to stay near Gregory County
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Population, race, income, age, and trends across South Dakota
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.