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/40242

40242

ZIP 40242 is in Louisville, Kentucky, in Jefferson County; area code 502; Eastern time. Louisville has 66 ZIP codes in all.

Type
Standard
Time zone
America/Kentucky/Louisville
County
Jefferson
Population
11,168
Coordinates
38.2762, -85.5871
☼ Live from 40242 — Louisville, KY

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 40242 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 40242
  • 🔢 Type 40242 into a pocket calculator and turn it upside down: ZhZOh — not quite a word, sorry.
  • ➕ As a number, 40,242 = 2 × 3 × 19 × 353. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1001110100110010
  • 🏠 Its numerical neighbours: 40241 (Louisville, KY, 2 mi away) and 40243 (Louisville, KY, 4 mi away).
  • 🔄 Backwards, 40242 becomes 24204, which is not a ZIP code at all.
  • 👥 19 other ZIP codes are made of exactly the same digits (04224, 04422, 20244, 20424, 20442, 22044, …). The farthest-flung twin is 04422 in Charleston, ME, 972 miles away.
  • 🧭 Farther south than 56% of all ZIP codes, and farther east than 55%.
  • 🎯705 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 40242 and you would come out at 38.28°S, 94.41°E — 1,285 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 50m of daylight. Shortest: 9h 30m.
  • 📏 At 2.9 square miles of land, 40242 is bigger than 14% of ZIP codes — room for about 2.2 Central Parks.
🌙 The sky over 40242 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population11,168This ZIP11,168
Households5,010This ZIP5,010
Housing units5,135This ZIP5,135
Median age37.5This ZIP37.5Kentucky39.1US 38.9
Median household income$75,417This ZIP$75,417Kentucky$63,726US $80,734
Median home value$299,600This ZIP$299,600Kentucky$205,600US $332,700
Median gross rent$1,314This ZIP$1,314Kentucky$967US $1,413
Bachelor's degree or higher47.9%This ZIP47.9%
Mean commute19.9 minThis ZIP19.9 min
Population density3,904.9 / sq miThis ZIP3,904.9 / sq mi

Business and tax activity

Business establishments127This ZIP127
Employees1,361This ZIP1,361
Annual payroll$46,052,000This ZIP$46,052,000
Tax returns filed5,310This ZIP5,310
Total adjusted gross income$425,039,000This ZIP$425,039,000

Land area

Land area2.86 sq miThis ZIP2.86 sq mi
Water area0.01 sq miThis ZIP0.01 sq mi

Other place names in 40242

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

ZIP codes near 40242

ZIPCityDistance
40222 Louisville, KY 1.6 mi
40241 Louisville, KY 1.8 mi
40223 Louisville, KY 2.8 mi
40243 Louisville, KY 3.9 mi
40207 Louisville, KY 3.9 mi
40025 Glenview, KY 3.9 mi
40041 Masonic Home, KY 4.4 mi
40027 Harrods Creek, KY 4.5 mi
40220 Louisville, KY 4.5 mi
40059 Prospect, KY 5.5 mi

Find every ZIP code within 10 miles of 40242 →

Questions about this ZIP code

Where is ZIP code 40242?

40242 is in Louisville, Kentucky, in Jefferson County, part of the Louisville/Jefferson County, KY-IN metropolitan area. Its published point location is 38.2762, -85.5871.

What county is 40242 in?

40242 lies in Jefferson County.

What area code is 40242?

Louisville uses area code 502, from NANPA's telephone records.

What time zone is 40242 in?

40242 uses America/Kentucky/Louisville.

How many people live in 40242?

About 11,168 people live in ZIP code 40242, in 5,010 households, at 3,904.9 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 40242?

$75,417 a year, against $63,726 across Kentucky.

What ZIP codes are near 40242?

The closest are 40222 (1.6 mi), 40241 (1.8 mi), 40223 (2.8 mi), 40243 (3.9 mi) and 40207 (3.9 mi).

Is 40242 a PO Box ZIP code?

40242 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “40242 ZIP Code — Louisville, Kentucky (Jefferson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/40242

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/40242.json

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