Total enrollment
216
+1 (+0%) vs SY 2017-18
Sully County
South Dakota · Public K-12
Across all districts in Sully County, public schools number 3 and enroll approximately 216 K-12 students (1 elementary, 1 middle, and 1 high).
7-year change in Sully County
SY 2017-18 vs SY 2024-25School count
3
0 (0%) vs SY 2017-18
% White
83%
was 87%
% Hispanic
3%
was 3%
% Black
1%
was 0%
% Asian
0%
was 1%
Source: NCES Common Core of Data, enrollment-weighted demographic averages
Residents
1,526
all ages · ACS 5-yr
Schools
3
1 districts
Enrollment
216
students · NCES CCD
Median income
$72,578
Above South Dakota avg
Free/reduced lunch
24.1%
Below South Dakota avg
Elementary
1
79 students
Middle
1
66 students
High
1
71 students
Combined / other
0
schools
LARGEST DISTRICT
Agar-Blunt-Onida School District 58-3
216 students · 1 district in Sully County
County vs. school enrollment demographics
Left bar is the racial makeup of Sully County residents (Census ACS 5-year). Right bar is the enrollment-weighted makeup of public schools in the county (NCES CCD). NCES systematically under-reports Hispanic, Pacific Islander, and Native American enrollment for many schools; where the resident share is meaningful but the reported school share is zero, we mark the school bar "not reported".
County residents
School enrollment
Bachelor's+
24.1%
adults 25+
Poverty rate
5.0%
ACS 5-year
Unemployment
0.0%
civilian labor
Median age
47
22.0% under 18
Test scores in Sully County
Latest 2024-25 ELA proficiency, 2 schools ranked. South Dakota state average: 50.4%.
Top 2 schools (ELA)
- Sully Buttes Middle School - 06· 67.7%
- Onida Elementary - 04· 51.3%
| Name | City | Level | Grades | Enrollment | Rating |
|---|---|---|---|---|---|
| Onida Elementary - 04 | Onida | Elementary | KG-05 | 79 | · |
| Sully Buttes High School - 07 | Onida | High | 09-12 | 71 | · |
| Sully Buttes Middle School - 06 | Onida | Middle | 06-08 | 66 | · |
Cities in Sully County
About Sully County
Sully County is a low-population South Dakota county of about 1,526 residents, home to 3 public schools and roughly 216 students.
In context, census numbers show typical household earnings sit around $72,578, 24% of adults hold a bachelor's degree or higher, and the poverty rate is around 5%.
On the level-by-level breakdown, Sully County is made up of 1 elementary school (79 students), 1 middle school (66), and 1 high school (71).
Agar-Blunt-Onida School District 58-3 is the biggest district by enrollment, covering about 216 students across Sully County.
Looking at the last 7 years. Total public-school enrollment in Sully County has held roughly steady since SY 2017-18, moving from about 215 students to 216. The White share of public-school enrollment contracted from 87% to 83%.
In the discussion threads here, the community for Sully County discusses comparison threads between local schools and program reviews. Posts come from current and former families, staff, and alumni.
Frequently asked questions
DATA · Census ACS 5-year · NCES Common Core of Data