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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/40604

40604

ZIP 40604 is in Frankfort, Kentucky, in Franklin County; area code 502; Eastern time. Frankfort has 9 ZIP codes in all.

Type
No street area
Time zone
America/New_York
County
Franklin
Metro area
Frankfort, KY
Coordinates
38.2341, -84.8748

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 40601, whose figures describe that area — not this ZIP code.

☼ Live from 40604 — Frankfort, KY

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Where 40604 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 40604
  • 🔢 Type 40604 into a pocket calculator and turn it upside down: hOgOh — not quite a word, sorry.
  • ⇆40604 reads the same backwards. It is one of only 412 palindromic ZIP codes.
  • ➕ As a number, 40,604 = 2 × 2 × 10151. Its digits add up to 14, a total 1,416 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1001111010011100
  • 🏠 Its numerical neighbours: 40603 (Frankfort, KY, 0 mi away) and 40618 (Frankfort, KY, 0 mi away).
  • 👥 15 other ZIP codes are made of exactly the same digits (04046, 04064, 04406, 04460, 04640, 06404, …). The farthest-flung twin is 04460 in Medway, ME, 981 miles away.
  • 🧭 Farther south than 57% of all ZIP codes, and farther east than 57%.
  • 🎯743 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 40604 and you would come out at 38.23°S, 95.13°E — 1,247 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 50m of daylight. Shortest: 9h 30m.
🌙 The sky over 40604 today
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Source: USGS.

Business and tax activity

Business establishments6This ZIP6
Employees89This ZIP89
Annual payroll$15,334,000This ZIP$15,334,000

Land area

ZIP codes near 40604

ZIPCityDistance
40602 Frankfort, KY 0.0 mi
40603 Frankfort, KY 0.0 mi
40618 Frankfort, KY 0.0 mi
40619 Frankfort, KY 0.0 mi
40620 Frankfort, KY 0.0 mi
40601 Frankfort, KY 0.3 mi
40621 Frankfort, KY 2.3 mi
40622 Frankfort, KY 2.3 mi
40347 Midway, KY 9.5 mi
40003 Bagdad, KY 9.6 mi

Find every ZIP code within 10 miles of 40604 →

Questions about this ZIP code

Where is ZIP code 40604?

40604 is in Frankfort, Kentucky, in Franklin County, part of the Frankfort, KY micropolitan area. Its published point location is 38.2341, -84.8748.

What county is 40604 in?

40604 lies in Franklin County.

What area code is 40604?

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

What time zone is 40604 in?

40604 uses America/New_York.

What ZIP codes are near 40604?

The closest are 40602 (0 mi), 40603 (0 mi), 40618 (0 mi), 40619 (0 mi) and 40620 (0 mi).

Is 40604 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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Cite this page

zipcodes.pro. “40604 ZIP Code — Frankfort, Kentucky (Franklin County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/40604

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curl https://zipcodes.pro/zip/40604.json

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