Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/SD/DE-SMET

De Smet ZIP code, South Dakota

The ZIP code for De Smet, SD is 57231, and its area code is 605.

USPS city name
1 ZIP code
Population
943
Area code
605

De Smet in numbers

About 943 people live in De Smet, in 427 households. The median household income is $67,321 a year, 10% below the South Dakota median of $75,081 (US: $80,734). The median owner-occupied home is valued at $165,200 (36% below the South Dakota median), and median gross rent is $708 a month. The median age is 47.3; 22.1% of adults 25 and over hold a bachelor's degree or higher (31.9% across South Dakota); the average commute takes 12 minutes.

Population943De Smet943
Households427De Smet427
Median age47.3De Smet47.3South Dakota38.0US 38.9
Median household income$67,321De Smet$67,321South Dakota$75,081US $80,734
Median home value$165,200De Smet$165,200South Dakota$257,400US $332,700
Median gross rent$708De Smet$708South Dakota$946US $1,413
Bachelor's degree or higher22.1%De Smet22.1%South Dakota31.9%US 35.7%
Mean commute11.7 minDe Smet11.7 minSouth Dakota17.8 minUS 26.4 min
Population density814 / sq miDe Smet814 / sq mi

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

ZIP codes addressed as De Smet

ZIP codes with the USPS city name De Smet
ZIP City Type Population Median income Median home
57231 De Smet , SD Standard 1,724 $78,646 $212,200

Map of De Smet ZIP codes

57231

The ZIP codes of De Smet, SD, 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.

Towns near De Smet

The nearest larger towns are Volga (2,408 people, 31 mi), Huron (14,385 people, 33 mi) and Madison (6,094 people, 34 mi).

More nearby: every ZIP code in Kingsbury County · South Dakota ZIP codes

Cite this page

zipcodes.pro. “De Smet, SD ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/sd/de-smet

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