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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).

4-year change in Sully County

SY 2020-21 vs SY 2024-25
Total enrollment
216
-14 (-6%) vs SY 2020-21
School count
3
0 (0%) vs SY 2020-21
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
White
87%
Hispanic
0%
Black
5%
Asian
0%
Two or more
5%
Native American
4%
Pacific Islander
0%
School enrollment
White
83%
Hispanic
3%
Black
n/r
Asian
0%
Two or more
5%
Native American
8%
Pacific Islander
0%
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)
  1. Sully Buttes Middle School - 06· 67.7%
  2. Onida Elementary - 04· 51.3%

See all 2 schools in Sully County ranked by score →

All schools (3)

LargestA-ZTop rated
NameCityLevelGradesEnrollmentRating
Onida Elementary - 04OnidaElementaryKG-0579·
Sully Buttes High School - 07OnidaHigh09-1271·
Sully Buttes Middle School - 06OnidaMiddle06-0866·

Cities in Sully County

Onida3 schools

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 4 years. Total public-school enrollment in Sully County has declined 6% since SY 2020-21, moving from about 230 students to 216.

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

How many public schools are in Sully County?
Sully County, South Dakota has 3 public K-12 schools serving approximately 216 students.
How many high schools are in Sully County?
Sully County, South Dakota has 1 public high school, serving approximately 71 students.
How many middle schools are in Sully County?
Sully County, South Dakota has 1 public middle school, serving approximately 66 students.
How many elementary schools are in Sully County?
Sully County, South Dakota has 1 public elementary school, serving approximately 79 students.
What is the largest school district in Sully County?
Agar-Blunt-Onida School District 58-3 is the largest school district in Sully County, serving approximately 216 students. The county contains 1 school district overall.
How many people live in Sully County?
Sully County has roughly 1,526 residents according to the latest Census ACS 5-year estimate.
What is the median household income in Sully County?
Median household income in Sully County is $72,578, above the South Dakota average of $70,004. About 5.0% of residents live below the federal poverty line.
How educated are residents of Sully County?
Approximately 24.1% of adults 25 and older in Sully County hold a bachelor's degree or higher, according to the Census ACS 5-year estimate.
What share of students in Sully County qualify for free or reduced lunch?
Roughly 24.1% of students in Sully County public schools qualify for free or reduced-price lunch, a common proxy for low-income enrollment. This is lower than the South Dakota county average of 42.3%.
What is the student-teacher ratio in Sully County schools?
Across Sully County public schools, the enrollment-weighted student-teacher ratio is approximately 8.4 to 1.
DATA · Census ACS 5-year · NCES Common Core of Data