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/40423

40423

ZIP 40423 is in Danville, Kentucky, in Boyle County; area code 859; Eastern time. Danville has 2 ZIP codes; the other is 40422.

Type
No street area
Time zone
America/New_York
County
Boyle
Metro area
Danville, KY
Coordinates
37.6456, -84.7722

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 40422, whose figures describe that area — not this ZIP code.

☼ Live from 40423 — Danville, KY

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 40423 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 40423
  • 🔢 Type 40423 into a pocket calculator and turn it upside down: EZhOh — not quite a word, sorry.
  • ➕ 40423 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1001110111100111
  • 🏠 Its numerical neighbours: 40422 (Danville, KY, 2 mi away) and 40434 (Gray Hawk, KY, 49 mi away).
  • 🔄 Backwards, 40423 becomes 32404 — and that is a real ZIP code: Panama City, FL, 517 miles away.
  • 👥 37 other ZIP codes are made of exactly the same digits (02344, 03244, 03442, 04234, 04243, 04342, …). The farthest-flung twin is 34024 in APO AA, a military post office, 1,628 miles away.
  • 🧭 Farther south than 60% of all ZIP codes, and farther east than 57%.
  • 🎯758 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 40423 and you would come out at 37.65°S, 95.23°E — 1,232 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 46m of daylight. Shortest: 9h 33m.
🌙 The sky over 40423 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments17This ZIP17
Employees265This ZIP265
Annual payroll$12,290,000This ZIP$12,290,000

Land area

ZIP codes near 40423

ZIPCityDistance
40422 Danville, KY 1.9 mi
40440 Junction City, KY 5.9 mi
40310 Burgin, KY 7.2 mi
40410 Bryantsville, KY 8.2 mi
40464 Parksville, KY 9.8 mi
40452 Mitchellsburg, KY 10.1 mi
40484 Stanford, KY 10.2 mi
40444 Lancaster, KY 10.7 mi
40468 Perryville, KY 11.5 mi
40330 Harrodsburg, KY 11.7 mi

Find every ZIP code within 10 miles of 40423 →

Questions about this ZIP code

Where is ZIP code 40423?

40423 is in Danville, Kentucky, in Boyle County, part of the Danville, KY micropolitan area. Its published point location is 37.6456, -84.7722.

What county is 40423 in?

40423 lies in Boyle County.

What area code is 40423?

Danville uses area code 859, from NANPA's telephone records.

What time zone is 40423 in?

40423 uses America/New_York.

What ZIP codes are near 40423?

The closest are 40422 (1.9 mi), 40440 (5.9 mi), 40310 (7.2 mi), 40410 (8.2 mi) and 40464 (9.8 mi).

Is 40423 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.

Download or cite

Cite this page

zipcodes.pro. “40423 ZIP Code — Danville, Kentucky (Boyle County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/40423

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/40423.json

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