Sully County, South Dakota Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 63rd-largest in South Dakota
The population of Sully County, South Dakota is 1,481 as of the 2023 American Community Survey, making it the 63rd-largest county in South Dakota. The median household income is $70,250, the median home value is $198,700, and the median age is 51.4.
The population of Sully County has grown 6.6% since 2010 (1,377 → 1,468), a +0.46% annualized rate.
1,481
Population
+0.46%
Annual growth
1
People / sq mi
$70,250
Median Income
$198,700
Median Home Value
Sully County covers 1,007 sq mi of land at 1.5 people per square mile.
About Sully County, SD
What distinguishes Sully County is density: among the most sparsely settled of US counties, around 1 people per square mile. Sully County is a county in South Dakota with a population of 1,481.
The typical household here earns about $70,250, below the US median of $78,538. Poverty is among the lowest of comparable US counties, at 3.8% — below the national 12.4%. Median home value is $198,700, with typical rent around $913.
Roughly 20.9% of adults have a bachelor’s, below the national 35.0%. Remote work is widespread — 15.4% of workers stay home, above the national 14.0%, and the average commute runs about 17 minutes each way.
Sully County Population History (2010-2024)
The county of Sully County had a population of 1,377 in 2010 and 1,468 in 2024, a 6.6% growth over 14 years. The peak was 1,485 in 2023. Average annual growth rate: 0.48%.
1,468
Population (2024)
1,377
Population (2010)
1,485
Peak (2023)
0.48%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 1,377 |
| 2011 | 1,374 |
| 2012 | 1,429 |
| 2013 | 1,436 |
| 2014 | 1,406 |
| 2015 | 1,402 |
| 2016 | 1,409 |
| 2017 | 1,400 |
| 2018 | 1,373 |
| 2019 | 1,377 |
| 2020 | 1,452 |
| 2021 | 1,472 |
| 2022 | 1,478 |
| 2023 | 1,485 |
| 2024 | 1,468 |
Race & Ethnicity
| White | 92.5% |
| Black or African American | 5.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.1% |
| Two or More Races | 0.0% |
Age & Sex
51.4
Median Age
45.0%
Female
55.0%
Male
23.8%
Age 65+
Age Distribution
Children (under 15): 14.3% · Seniors (65+): 23.8%
Income & Poverty
| Median household income | $70,250$-2,171 vs state |
| Mean household income | $106,129 |
| Per-capita income | $47,550 |
| Poverty rate | 3.8%-3.6% vs state |
| Unemployment rate | 0.0% |
| Employment-to-population | 71.4% |
Top Industries by Employment
The largest employment sector in Sully County is agriculture, accounting for 29.8% of workers.
How residents commute
0.0%
Drive alone
3.1%
Carpool
67.3%
Public transit
15.4%
Work from home
16.6 min
Avg commute
Housing
$198,700$-38,100 vs state
Median home value
$913
Median rent
76.1%
Homeownership rate
908
Total housing units
68.7%
Occupied
31.3%
Vacant
23.9%
Renter-occupied
Social & access
92.1%
With health insurance
92.1%
With broadband internet
28.8%
Foreign-born
4.3%
Veterans (18+)
9.8%
With a disability
94.7%
Speak language other than English at home
Education
96.2%
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
Sully County, South Dakota has a population of 1,481 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 63rd-largest county in South Dakota. Population density is 1 people per square mile.
The population of Sully County has grown 6.6% since 2010 (1,377 → 1,468), a +0.46% annualized rate.
The median household income in Sully County, South Dakota is $70,250, with mean (average) household income of $106,129 and per-capita income of $47,550. 3.8% of residents live below the federal poverty level.
In Sully County, the largest racial and ethnic groups are White (92.5%), Black or African American (5.0%), Hispanic or Latino (1.1%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Sully County, South Dakota is 51.4 years. Residents are 45.0% female and 55.0% male.
The median home value in Sully County is $198,700 and median monthly rent is $913. 76.1% of occupied housing units are owner-occupied. The county has 908 total housing units, 31.3% of which are vacant.
The largest employment sector in Sully County, South Dakota is agriculture, forestry, fishing, and mining, employing 29.8% of workers. The unemployment rate is 0.0%.
Sioux Falls is among the largest cities associated with Sully 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.