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.
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Statewide data for South Dakota
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.