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zipcodes.pro — STATE/SD/COUNTY/SULLY

Sully County, SD ZIP codes

Sully County, SD has 2 ZIP codes, in 2 towns: 57564 and 57520. 3 more cross into it from a neighbouring county: 57501, 57536 and 57522.

The county seat is Onida.

ZIP codes
2
Partly in it
3 more
Towns
2
County seat
Onida
County FIPS
46119
Population
1,526
Median household income
$72,578
Land area
1,007 sq mi

Sully County ZIP codes by town

Onida (county seat)
57564

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

ZIP codes partly in Sully County

These ZIP codes lie mostly in a neighbouring county but each cover a twentieth or more of Sully County.

Map of Sully County ZIP codes

5752057564

The ZIP codes of Sully County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Sully County in numbers

About 1,526 people live in Sully County, in 637 households, the 63rd most populous of South Dakota's 66 counties. The median household income is $72,578 a year, 3% below the South Dakota median of $75,081 (US: $80,734). The median owner-occupied home is valued at $205,400 (20% below the South Dakota median), and median gross rent is $842 a month. The median age is 46.9; 24.1% of adults 25 and over hold a bachelor's degree or higher (31.9% across South Dakota); the average commute takes 19 minutes.

Population1,526Sully1,526
Households637Sully637
Median age46.9Sully46.9South Dakota38.0US 38.9
Median household income$72,578Sully$72,578South Dakota$75,081US $80,734
Median home value$205,400Sully$205,400South Dakota$257,400US $332,700
Median gross rent$842Sully$842South Dakota$946US $1,413
Bachelor's degree or higher24.1%Sully24.1%South Dakota31.9%US 35.7%
Mean commute19.3 minSully19.3 minSouth Dakota17.8 minUS 26.4 min
Population density2 / sq miSully2 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Sully County

Largest towns in Sully County
TownZIP codesPopulation
Onida 1 644
Agar 1 81

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Sully County.

Not sure you are in Sully County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Sully County, with figures

ZIP codes in Sully County
ZIP City Type Population Median income Median home
57520 Agar , SD Standard 118 $50,417 $118,800
57564 Onida , SD Standard 962 $74,297 $210,600

Cite this page

zipcodes.pro. “Sully County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/sd/county/sully

Underlying data is public domain or openly licensed — sources, vintages and licences.