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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/53548

53548

ZIP 53548 is in Janesville, Wisconsin, in Rock County; area code 608; Central time. Janesville has 4 ZIP codes; the others are 53545, 53546 and 53547.

Type
Standard
Time zone
America/Chicago
County
Rock
Population
19,916
Coordinates
42.6893, -89.1313
☼ Live from 53548 — Janesville, WI

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Where 53548 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 53548
  • 🔢 Type 53548 into a pocket calculator and turn it upside down: BhSES — not quite a word, sorry.
  • ➕ As a number, 53,548 = 2 × 2 × 11 × 1217. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1101000100101100
  • 🏠 Its numerical neighbours: 53547 (Janesville, WI, 6 mi away) and 53549 (Jefferson, WI, 28 mi away).
  • 🔄 Backwards, 53548 becomes 84535 — and that is a real ZIP code: Monticello, UT, 1,111 miles away.
  • 👥 29 other ZIP codes are made of exactly the same digits (35458, 35548, 35584, 38455, 38545, 38554, …). The farthest-flung twin is 85354 in Tonopah, AZ, 1,445 miles away.
  • 🧭 Farther north than 81% of all ZIP codes, and farther west than 53%.
  • 🎯529 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 53548 and you would come out at 42.69°S, 90.87°E — 1,088 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 19m of daylight. Shortest: 9h 02m.
  • 📏 At 75.0 square miles of land, 53548 is bigger than 71% of ZIP codes — room for about 57 Central Parks.
🌙 The sky over 53548 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population19,916This ZIP19,916
Households8,562This ZIP8,562
Housing units9,038This ZIP9,038
Median age43.3This ZIP43.3Wisconsin40.2US 38.9
Median household income$76,869This ZIP$76,869Wisconsin$77,485US $80,734
Median home value$234,900This ZIP$234,900Wisconsin$266,500US $332,700
Median gross rent$1,045This ZIP$1,045Wisconsin$1,087US $1,413
Bachelor's degree or higher26.4%This ZIP26.4%
Mean commute22.5 minThis ZIP22.5 min
Population density265.6 / sq miThis ZIP265.6 / sq mi

Business and tax activity

Business establishments294This ZIP294
Employees2,784This ZIP2,784
Annual payroll$144,334,000This ZIP$144,334,000
Tax returns filed9,280This ZIP9,280
Total adjusted gross income$601,423,000This ZIP$601,423,000

Land area

Land area74.98 sq miThis ZIP74.98 sq mi
Water area1.17 sq miThis ZIP1.17 sq mi

Other place names in 53548

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

ZIP codes near 53548

ZIPCityDistance
53537 Footville, WI 4.2 mi
53542 Hanover, WI 4.2 mi
53545 Janesville, WI 5.7 mi
53547 Janesville, WI 5.8 mi
53501 Afton, WI 6.6 mi
53576 Orfordville, WI 6.8 mi
53536 Evansville, WI 8.5 mi
53546 Janesville, WI 9.6 mi
53511 Beloit, WI 10.0 mi
53563 Milton, WI 11.9 mi

Find every ZIP code within 10 miles of 53548 →

Questions about this ZIP code

Where is ZIP code 53548?

53548 is in Janesville, Wisconsin, in Rock County, part of the Janesville-Beloit, WI metropolitan area. Its published point location is 42.6893, -89.1313.

What county is 53548 in?

53548 lies in Rock County.

What area code is 53548?

Janesville uses area code 608, from NANPA's telephone records.

What time zone is 53548 in?

53548 uses America/Chicago.

How many people live in 53548?

About 19,916 people live in ZIP code 53548, in 8,562 households, at 265.6 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 53548?

$76,869 a year, against $77,485 across Wisconsin.

What ZIP codes are near 53548?

The closest are 53537 (4.2 mi), 53542 (4.2 mi), 53545 (5.7 mi), 53547 (5.8 mi) and 53501 (6.6 mi).

Is 53548 a PO Box ZIP code?

53548 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “53548 ZIP Code — Janesville, Wisconsin (Rock County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/53548

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