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 — RANKINGS/KY/LARGEST-POPULATION

ZIP Codes With the Largest Population in Kentucky

What this measures. Population of the Census tabulation area, ACS 5-year estimate. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Population
1 40475 Richmond Madison 65,961
2 42101 Bowling Green Warren 65,421
3 41042 Florence Boone 57,634
4 42701 Elizabethtown Hardin 53,987
5 40324 Georgetown Scott 53,406
6 40601 Frankfort Franklin 51,893
7 40509 Lexington Fayette 47,036
8 40356 Nicholasville Jessamine 45,849
9 42301 Owensboro Daviess 45,445
10 40214 Louisville Jefferson 45,405
11 40216 Louisville Jefferson 44,047
12 40299 Louisville Jefferson 42,207
13 42303 Owensboro Daviess 42,119
14 42104 Bowling Green Warren 42,076
15 42240 Hopkinsville Christian 41,415
16 40229 Louisville Jefferson 41,299
17 40291 Louisville Jefferson 41,222
18 41017 Ft Mitchell Kenton 40,719
19 40219 Louisville Jefferson 39,909
20 40245 Louisville Jefferson 39,835
21 40165 Shepherdsville Bullitt 38,403
22 40272 Louisville Jefferson 38,289
23 40511 Lexington Fayette 38,176
24 42420 Henderson Henderson 38,133
25 40515 Lexington Fayette 37,384
26 40391 Winchester Clark 36,796
27 40517 Lexington Fayette 35,656
28 40220 Louisville Jefferson 35,078
29 40218 Louisville Jefferson 33,736
30 41051 Independence Kenton 33,054
31 40065 Shelbyville Shelby 32,160
32 42141 Glasgow Barren 31,506
33 42071 Murray Calloway 30,981
34 42001 Paducah McCracken 30,856
35 40241 Louisville Jefferson 30,696
36 40004 Bardstown Nelson 30,601
37 40701 Corbin Whitley 30,526
38 42003 Paducah McCracken 29,672
39 41018 Erlanger Kenton 28,940
40 40207 Louisville Jefferson 28,903
41 40403 Berea Madison 27,607
42 40503 Lexington Fayette 27,451
43 42431 Madisonville Hopkins 27,207
44 41011 Covington Kenton 26,981
45 40258 Louisville Jefferson 26,841
46 42718 Campbellsville Taylor 26,768
47 40031 La Grange Oldham 26,259
48 40502 Lexington Fayette 26,122
49 40422 Danville Boyle 25,950
50 40504 Lexington Fayette 25,816

Showing the top 50 of 780 ZIP codes in Kentucky that have this figure . 40475 ranks 1st at 65,961, against 25,816 in 50th place.

Other rankings for Kentucky

Cite this page

zipcodes.pro. “ZIP Codes With the Largest Population in Kentucky.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/ky/largest-population

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