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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/59638

59638

ZIP 59638 is Jefferson City, Montana, in Jefferson County; area code 406; Mountain time.

Type
Standard
Time zone
America/Denver
County
Jefferson
Metro area
Helena, MT
Population
769
Coordinates
46.3579, -112.0277
☼ Live from 59638 — Jefferson City, MT

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NEXRAD radar
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Local time: —

Where 59638 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 59638
  • 🔢 Type 59638 into a pocket calculator and turn it upside down: BEgGS — not quite a word, sorry.
  • ➕ As a number, 59,638 = 2 × 29819. Its digits add up to 31, a total 799 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1110100011110110
  • 🏠 Its numerical neighbours: 59636 (Fort Harrison, MT, 18 mi away) and 59639 (Lincoln, MT, 67 mi away).
  • 🔄 Backwards, 59638 becomes 83695, which is not a ZIP code at all.
  • 👥 33 other ZIP codes are made of exactly the same digits (35896, 35968, 35986, 36859, 38569, 38659, …). The farthest-flung twin is 96853 in Jbphh, HI, 3,090 miles away.
  • 🧭 Farther north than 94% of all ZIP codes, and farther west than 87%.
  • 🎯813 miles northwest of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 59638 and you would come out at 46.36°S, 67.97°E — 231 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 48m of daylight. Shortest: 8h 35m.
  • 📏 At 60.4 square miles of land, 59638 is bigger than 65% of ZIP codes — room for about 46 Central Parks.
🌙 The sky over 59638 today
  • Working out the sun…
🌋 Shake report
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Source: USGS.

People and housing

Population769This ZIP769
Households271This ZIP271
Housing units271This ZIP271
Median age45.1This ZIP45.1Montana40.4US 38.9
Median household income$126,723This ZIP$126,723Montana$72,509US $80,734
Bachelor's degree or higher30.5%This ZIP30.5%
Mean commute24.4 minThis ZIP24.4 min
Population density12.7 / sq miThis ZIP12.7 / sq mi

Business and tax activity

Business establishments19This ZIP19
Employees52This ZIP52
Annual payroll$2,188,000This ZIP$2,188,000

Land area

Land area60.41 sq miThis ZIP60.41 sq mi
Water area0.00 sq mi

Other place names in 59638

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

ZIP codes near 59638

ZIPCityDistance
59634 Clancy, MT 6.0 mi
59632 Boulder, MT 13.1 mi
59601 Helena, MT 14.5 mi
59623 Helena, MT 16.0 mi
59620 Helena, MT 16.2 mi
59624 Helena, MT 16.2 mi
59626 Helena, MT 16.2 mi
59625 Helena, MT 16.8 mi
59635 East Helena, MT 17.0 mi
59631 Basin, MT 17.9 mi

Find every ZIP code within 10 miles of 59638 →

Questions about this ZIP code

Where is ZIP code 59638?

59638 is in Jefferson City, Montana, in Jefferson County, part of the Helena, MT metropolitan area. Its published point location is 46.3579, -112.0277.

What county is 59638 in?

59638 lies in Jefferson County.

What area code is 59638?

Jefferson City uses area code 406, from NANPA's telephone records.

What time zone is 59638 in?

59638 uses America/Denver.

How many people live in 59638?

About 769 people live in ZIP code 59638, in 271 households, at 12.7 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 59638?

$126,723 a year, against $72,509 across Montana.

What ZIP codes are near 59638?

The closest are 59634 (6 mi), 59632 (13.1 mi), 59601 (14.5 mi), 59623 (16 mi) and 59620 (16.2 mi).

Is 59638 a PO Box ZIP code?

59638 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “59638 ZIP Code — Jefferson City, Montana (Jefferson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/59638

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