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 — ZIP/57738

57738

ZIP 57738 is Fairburn, South Dakota, in Custer County; area code 605; Mountain time.

Upside down on a calculator, 57738 reads BELLS.

Type
Standard
Time zone
America/Denver
County
Custer
Metro area
Rapid City, SD
Population
356
Coordinates
43.6849, -103.1587
☼ Live from 57738 — Fairburn, SD

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 57738 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 57738
  • 🔢 Type 57738 into a pocket calculator and turn it upside down: BELLS — a real word! rare
  • ➕ As a number, 57,738 = 2 × 3 × 9623. Its digits add up to 30, a total 1,024 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1110000110001010
  • 🏠 Its numerical neighbours: 57737 (Enning, SD, 68 mi away) and 57741 (Fort Meade, SD, 53 mi away).
  • 🔄 Backwards, 57738 becomes 83775, which is not a ZIP code at all.
  • 👥 31 other ZIP codes are made of exactly the same digits (37857, 38577, 53778, 57783, 58377, 58737, …). The farthest-flung twin is 78537 in Donna, TX, 1,243 miles away.
  • 🧭 Farther north than 86% of all ZIP codes, and farther west than 81%.
  • 🎯356 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 57738 and you would come out at 43.68°S, 76.84°E — 502 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 27m of daylight. Shortest: 8h 55m.
  • 📏 At 185.1 square miles of land, 57738 is bigger than 90% of ZIP codes — room for about 141 Central Parks.
🌙 The sky over 57738 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population356This ZIP356
Households210This ZIP210
Housing units252This ZIP252
Median age65.5This ZIP65.5South Dakota38.0US 38.9
Median household income$52,308This ZIP$52,308South Dakota$75,081US $80,734
Bachelor's degree or higher1.2%This ZIP1.2%
Mean commute32.7 minThis ZIP32.7 min
Population density1.9 / sq miThis ZIP1.9 / sq mi

Business and tax activity

Business establishments3This ZIP3
Employees2This ZIP2
Annual payroll$134,000This ZIP$134,000
Tax returns filed110This ZIP110
Total adjusted gross income$6,213,000This ZIP$6,213,000

Land area

Land area185.11 sq miThis ZIP185.11 sq mi
Water area0.61 sq miThis ZIP0.61 sq mi

Other place names in 57738

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 57738

ZIPCityDistance
57744 Hermosa, SD 9.8 mi
57751 Keystone, SD 18.5 mi
57722 Buffalo Gap, SD 18.8 mi
57773 Pringle, SD 22.6 mi
57766 Oral, SD 22.7 mi
57703 Rapid City, SD 22.8 mi
57730 Custer, SD 24.6 mi
57725 Caputa, SD 25.0 mi
57702 Rapid City, SD 27.2 mi
57747 Hot Springs, SD 28.1 mi

Find every ZIP code within 10 miles of 57738 →

Questions about this ZIP code

Where is ZIP code 57738?

57738 is in Fairburn, South Dakota, in Custer County, part of the Rapid City, SD metropolitan area. Its published point location is 43.6849, -103.1587.

What county is 57738 in?

57738 lies in Custer County.

What area code is 57738?

Fairburn uses area code 605, from NANPA's telephone records.

What time zone is 57738 in?

57738 uses America/Denver.

How many people live in 57738?

About 356 people live in ZIP code 57738, in 210 households, at 1.9 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 57738?

$52,308 a year, against $75,081 across South Dakota.

What ZIP codes are near 57738?

The closest are 57744 (9.8 mi), 57751 (18.5 mi), 57722 (18.8 mi), 57773 (22.6 mi) and 57766 (22.7 mi).

Is 57738 a PO Box ZIP code?

57738 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “57738 ZIP Code — Fairburn, South Dakota (Custer County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/57738

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/57738.json

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