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/52099

52099

ZIP 52099 is in Dubuque, Iowa, in Dubuque County; area code 563; Central time. Dubuque has 5 ZIP codes; the others are 52001, 52002, 52003 and 52004.

Type
No street area
Time zone
America/Chicago
County
Dubuque
Metro area
Dubuque, IA
Coordinates
42.5006, -90.6646

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 52001, whose figures describe that area — not this ZIP code.

☼ Live from 52099 — Dubuque, IA

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Where 52099 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 52099
  • 🔢 Type 52099 into a pocket calculator and turn it upside down: GGOZS — not quite a word, sorry.
  • ➕ As a number, 52,099 = 53 × 983. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1100101110000011
  • 🏠 Its numerical neighbours: 52079 (Zwingle, IA, 15 mi away) and 52101 (Decorah, IA, 82 mi away).
  • 🔄 Backwards, 52099 becomes 99025 — and that is a real ZIP code: Newman Lake, WA, 1,331 miles away.
  • 👥 18 other ZIP codes are made of exactly the same digits (09259, 20599, 25909, 29059, 29590, 29905, …). The farthest-flung twin is 09259 in APO AE, a military post office, 4,620 miles away.
  • 🧭 Farther north than 79% of all ZIP codes, and farther west than 58%.
  • 🎯451 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 52099 and you would come out at 42.50°S, 89.34°E — 1,029 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 18m of daylight. Shortest: 9h 03m.
🌙 The sky over 52099 today
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Source: USGS.

Land area

ZIP codes near 52099

ZIPCityDistance
52004 Dubuque, IA 0.0 mi
52001 Dubuque, IA 3.6 mi
52003 Dubuque, IA 4.8 mi
52002 Dubuque, IA 5.7 mi
61025 East Dubuque, IL 5.9 mi
53812 Kieler, WI 6.4 mi
53824 Sinsinawa, WI 6.6 mi
53811 Hazel Green, WI 7.6 mi
52068 Peosta, IA 9.2 mi
53808 Dickeyville, WI 10.1 mi

Find every ZIP code within 10 miles of 52099 →

Questions about this ZIP code

Where is ZIP code 52099?

52099 is in Dubuque, Iowa, in Dubuque County, part of the Dubuque, IA metropolitan area. Its published point location is 42.5006, -90.6646.

What county is 52099 in?

52099 lies in Dubuque County.

What area code is 52099?

Dubuque uses area code 563, from NANPA's telephone records.

What time zone is 52099 in?

52099 uses America/Chicago.

What ZIP codes are near 52099?

The closest are 52004 (0 mi), 52001 (3.6 mi), 52003 (4.8 mi), 52002 (5.7 mi) and 61025 (5.9 mi).

Is 52099 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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zipcodes.pro. “52099 ZIP Code — Dubuque, Iowa (Dubuque County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/52099

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