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zipcodes.pro — STATE/SD/COUNTY/BENNETT

Bennett County, SD ZIP codes

Bennett County, SD has 3 ZIP codes, in 3 towns: 57551, 57714 and 57574.

The county seat is Martin.

ZIP codes
3
Towns
3
County seat
Martin
County FIPS
46007
Population
3,345
Median household income
$53,750
Land area
1,185 sq mi

Bennett County ZIP codes by town

Martin (county seat)
57551

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.

Map of Bennett County ZIP codes

575515757457714

The ZIP codes of Bennett 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.

Bennett County in numbers

About 3,345 people live in Bennett County, in 920 households, the 45th most populous of South Dakota's 66 counties. The median household income is $53,750 a year, 28% below the South Dakota median of $75,081 (US: $80,734). The median owner-occupied home is valued at $156,400 (39% below the South Dakota median), and median gross rent is $617 a month. The median age is 27.4; 18.3% of adults 25 and over hold a bachelor's degree or higher (31.9% across South Dakota); the average commute takes 12 minutes.

Population3,345Bennett3,345
Households920Bennett920
Median age27.4Bennett27.4South Dakota38.0US 38.9
Median household income$53,750Bennett$53,750South Dakota$75,081US $80,734
Median home value$156,400Bennett$156,400South Dakota$257,400US $332,700
Median gross rent$617Bennett$617South Dakota$946US $1,413
Bachelor's degree or higher18.3%Bennett18.3%South Dakota31.9%US 35.7%
Mean commute12.0 minBennett12.0 minSouth Dakota17.8 minUS 26.4 min
Population density3 / sq miBennett3 / 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 Bennett County

Largest towns in Bennett County
TownZIP codesPopulation
Martin 1 947
Allen 1 783
Tuthill 1 73

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 Bennett County.

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

Every ZIP code in Bennett County, with figures

ZIP codes in Bennett County
ZIP City Type Population Median income Median home
57551 Martin , SD Standard 2,084 $70,096 $161,900
57574 Tuthill , SD Standard 73 under $2,500 $261,900
57714 Allen , SD Standard 1,144 — $111,600

Cite this page

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

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