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/71731

71731

ZIP 71731 is in El Dorado, Arkansas, in Union County; area code 870; Central time. El Dorado has 2 ZIP codes; the other is 71730.

Type
No street area
Time zone
America/Chicago
County
Union
Metro area
El Dorado, AR
Coordinates
33.2076, -92.6663

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 71730, whose figures describe that area — not this ZIP code.

☼ Live from 71731 — El Dorado, AR

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Where 71731 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 71731
  • 🔢 Type 71731 into a pocket calculator and turn it upside down: IELIL — not quite a word, sorry.
  • ➕ As a number, 71,731 = 11 × 6521. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10001100000110011
  • 🏠 Its numerical neighbours: 71730 (El Dorado, AR, 2 mi away) and 71740 (Emerson, AR, 30 mi away).
  • 🔄 Backwards, 71731 becomes 13717, which is not a ZIP code at all.
  • 👥 12 other ZIP codes are made of exactly the same digits (11377, 11737, 11773, 17317, 17371, 17731, …). The farthest-flung twin is 11737 in Farmingdale, NY, 1,178 miles away.
  • 🧭 Farther south than 83% of all ZIP codes, and farther west than 62%.
  • 🎯563 miles southeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 71731 and you would come out at 33.21°S, 87.33°E — 1,419 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 21m of daylight. Shortest: 9h 57m.
🌙 The sky over 71731 today
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  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments17This ZIP17
Employees1,026This ZIP1,026
Annual payroll$81,751,000This ZIP$81,751,000

Land area

ZIP codes near 71731

ZIPCityDistance
71730 El Dorado, AR 1.9 mi
71759 Norphlet, AR 7.4 mi
71750 Lawson, AR 10.6 mi
71762 Smackover, AR 11.1 mi
71724 Calion, AR 11.6 mi
71749 Junction City, AR 12.9 mi
71751 Louann, AR 15.0 mi
71758 Mount Holly, AR 16.0 mi
71256 Lillie, LA 18.1 mi
71079 Summerfield, LA 19.2 mi

Find every ZIP code within 10 miles of 71731 →

Questions about this ZIP code

Where is ZIP code 71731?

71731 is in El Dorado, Arkansas, in Union County, part of the El Dorado, AR micropolitan area. Its published point location is 33.2076, -92.6663.

What county is 71731 in?

71731 lies in Union County.

What area code is 71731?

El Dorado uses area code 870, from NANPA's telephone records.

What time zone is 71731 in?

71731 uses America/Chicago.

What ZIP codes are near 71731?

The closest are 71730 (1.9 mi), 71759 (7.4 mi), 71750 (10.6 mi), 71762 (11.1 mi) and 71724 (11.6 mi).

Is 71731 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “71731 ZIP Code — El Dorado, Arkansas (Union County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/71731

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/71731.json

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