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/MOST-TAX-RETURNS

ZIP Codes With the Most Tax Returns Filed in Kentucky

What this measures. Number of individual income tax returns filed. A rough proxy for how many households a ZIP code contains, available where census figures are not. Source: IRS Statistics of Income, ZIP code data, data release 2026-10-12.

# ZIP City County Returns filed
1 40475 Richmond Madison 27,150
2 41042 Florence Boone 25,950
3 42101 Bowling Green Warren 25,060
4 40601 Frankfort Franklin 24,870
5 42701 Elizabethtown Hardin 24,310
6 40324 Georgetown Scott 24,200
7 40299 Louisville Jefferson 22,000
8 40509 Lexington Fayette 21,090
9 40214 Louisville Jefferson 20,650
10 41017 Ft Mitchell Kenton 20,560
11 40216 Louisville Jefferson 20,440
12 40291 Louisville Jefferson 20,380
13 40356 Nicholasville Jessamine 20,320
14 42301 Owensboro Daviess 20,130
15 40229 Louisville Jefferson 19,550
16 40219 Louisville Jefferson 19,300
17 40245 Louisville Jefferson 18,930
18 42303 Owensboro Daviess 18,380
19 42104 Bowling Green Warren 17,930
20 42240 Hopkinsville Christian 17,800
21 40515 Lexington Fayette 17,640
22 40272 Louisville Jefferson 17,450
23 40165 Shepherdsville Bullitt 17,400
24 40517 Lexington Fayette 17,210
25 40511 Lexington Fayette 17,200
26 40220 Louisville Jefferson 16,800
27 42420 Henderson Henderson 16,570
28 40241 Louisville Jefferson 15,960
29 40391 Winchester Clark 15,890
30 40207 Louisville Jefferson 15,330
31 41051 Independence Kenton 15,200
32 40065 Shelbyville Shelby 15,060
33 40004 Bardstown Nelson 15,020
34 40218 Louisville Jefferson 14,530
35 42001 Paducah McCracken 14,100
36 41018 Erlanger Kenton 13,840
37 42141 Glasgow Barren 13,360
38 40503 Lexington Fayette 13,000
39 40258 Louisville Jefferson 12,890
40 40502 Lexington Fayette 12,670
41 40223 Louisville Jefferson 12,190
42 42003 Paducah McCracken 12,170
43 42071 Murray Calloway 12,120
44 41091 Union Boone 12,090
45 41011 Covington Kenton 12,000
46 41005 Burlington Boone 11,860
47 40701 Corbin Whitley 11,850
48 40383 Versailles Woodford 11,770
49 40047 Mount Washington Bullitt 11,720
50 40222 Louisville Jefferson 11,530

Showing the top 50 of 647 ZIP codes in Kentucky that have this figure . 40475 ranks 1st at 27,150, against 11,530 in 50th place.

Other rankings for Kentucky

Cite this page

zipcodes.pro. “ZIP Codes With the Most Tax Returns Filed in Kentucky.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/ky/most-tax-returns

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