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/MOUNTAIN-PLAINS

Mountain Plains ZIP codes, South Dakota

No ZIP code is named for Mountain Plains, SD; addresses there use a neighbouring town's name. The ZIP code covering it is 57783. Its area code is 605.

USPS city name
0 ZIP codes
Overlapping the city
1 more
Population
350
Area code
605

NANPA lists no telephone rate centre for Mountain Plains itself, so these are the area codes of the nearest one, Spearfish (0.0 miles). A town on an area-code boundary can differ from its neighbour.

Mountain Plains in numbers

About 350 people live in Mountain Plains, in 150 households. The median household income is $248,558 a year, 3.3 times the South Dakota median of $75,081 (US: $80,734). The median owner-occupied home is valued at $613,200 (2.4 times the South Dakota median). The median age is 63.4; 43.1% of adults 25 and over hold a bachelor's degree or higher (31.9% across South Dakota); the average commute takes 16 minutes.

Population350Mountain Plains350
Households150Mountain Plains150
Median age63.4Mountain Plains63.4South Dakota38.0US 38.9
Median household income$248,558Mountain Plains$248,558South Dakota$75,081US $80,734
Median home value$613,200Mountain Plains$613,200South Dakota$257,400US $332,700
Bachelor's degree or higher43.1%Mountain Plains43.1%South Dakota31.9%US 35.7%
Mean commute15.5 minMountain Plains15.5 minSouth Dakota17.8 minUS 26.4 min
Population density219 / sq miMountain Plains219 / sq mi

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

ZIP codes covering Mountain Plains

These ZIP codes cover part of Mountain Plains but are addressed as somewhere else.

ZIP codes overlapping Mountain Plains
ZIP City Type Population Median income Median home
57783 Spearfish , SD Standard 17,248 $74,844 $373,300

Map of Mountain Plains ZIP codes

57783

The ZIP codes of Mountain Plains, 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 Mountain Plains

The nearest larger towns are Spearfish (12,930 people, 2.9 mi), North Spearfish (1,858 people, 3.6 mi) and Deadwood (1,209 people, 9.0 mi).

Towns near Mountain Plains
TownPopulationDistance
Spearfish 12,930 2.9 mi
Lead 3,006 9.2 mi
Belle Fourche 5,804 13.6 mi
Sturgis 7,086 18.4 mi

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

Cite this page

zipcodes.pro. “Mountain Plains, SD ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/sd/mountain-plains

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