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/83420

83420

ZIP 83420 is Ashton, Idaho, in Fremont County; area codes 208 and 986; Mountain time.

Type
Standard
Time zone
America/Boise
County
Fremont
Metro area
Rexburg, ID
Population
2,580
Coordinates
44.0595, -111.3248
☼ Live from 83420 — Ashton, ID

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 83420 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 83420
  • 🔢 Type 83420 into a pocket calculator and turn it upside down: OZhEB — not quite a word, sorry.
  • ➕ As a number, 83,420 = 2 × 2 × 5 × 43 × 97. Its digits add up to 17, a total 2,133 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10100010111011100
  • 🏠 Its numerical neighbours: 83415 (Idaho Falls, ID, 54 mi away) and 83421 (Chester, ID, 12 mi away).
  • 🔄 Backwards, 83420 becomes 02438, which is not a ZIP code at all.
  • 👥 62 other ZIP codes are made of exactly the same digits (02348, 03284, 03824, 03842, 04238, 08234, …). The farthest-flung twin is 02348 in Lakeville, MA, 2,027 miles away.
  • 🧭 Farther north than 88% of all ZIP codes, and farther west than 86%.
  • 🎯716 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 83420 and you would come out at 44.06°S, 68.68°E — 373 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 30m of daylight. Shortest: 8h 53m.
  • 📏 At 410.8 square miles of land, 83420 is bigger than 97% of ZIP codes — room for about 312 Central Parks.
🌙 The sky over 83420 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population2,580This ZIP2,580
Households990This ZIP990
Housing units1,326This ZIP1,326
Median age49.4This ZIP49.4Idaho37.3US 38.9
Median household income$69,286This ZIP$69,286Idaho$77,800US $80,734
Median home value$337,700This ZIP$337,700Idaho$418,600US $332,700
Median gross rent$1,025This ZIP$1,025Idaho$1,238US $1,413
Bachelor's degree or higher29.0%This ZIP29.0%
Mean commute16.1 minThis ZIP16.1 min
Population density6.3 / sq miThis ZIP6.3 / sq mi

Business and tax activity

Business establishments89This ZIP89
Employees482This ZIP482
Annual payroll$22,082,000This ZIP$22,082,000
Tax returns filed1,220This ZIP1,220
Total adjusted gross income$86,678,000This ZIP$86,678,000

Land area

Land area410.77 sq miThis ZIP410.77 sq mi
Water area4.28 sq miThis ZIP4.28 sq mi

Other place names in 83420

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

ZIP codes near 83420

ZIPCityDistance
83421 Chester, ID 11.7 mi
83424 Felt, ID 12.6 mi
83436 Newdale, ID 14.8 mi
83452 Tetonia, ID 20.0 mi
83451 Teton, ID 20.3 mi
83445 Saint Anthony, ID 20.9 mi
83438 Parker, ID 22.7 mi
83414 Alta, WY 23.7 mi
83448 Sugar City, ID 24.1 mi
83422 Driggs, ID 25.6 mi

Find every ZIP code within 10 miles of 83420 →

Questions about this ZIP code

Where is ZIP code 83420?

83420 is in Ashton, Idaho, in Fremont County, part of the Rexburg, ID micropolitan area. Its published point location is 44.0595, -111.3248.

What county is 83420 in?

83420 lies in Fremont County.

What area code is 83420?

Ashton uses area codes 208 and 986, from NANPA's telephone records.

What time zone is 83420 in?

83420 uses America/Boise.

How many people live in 83420?

About 2,580 people live in ZIP code 83420, in 990 households, at 6.3 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 83420?

$69,286 a year, against $77,800 across Idaho.

What ZIP codes are near 83420?

The closest are 83421 (11.7 mi), 83424 (12.6 mi), 83436 (14.8 mi), 83452 (20 mi) and 83451 (20.3 mi).

Is 83420 a PO Box ZIP code?

83420 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “83420 ZIP Code — Ashton, Idaho (Fremont County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/83420

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/83420.json

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