ZIP Codes of Jefferson County, KY

Population & People
Population & People
Total Population
809,701
Household Income
Household Income
Median Income
$80,224
Housing
Housing
Total Housing Units
369,401
Business & Economy
Business & Economy
Total Businesses
20,588
Employment
Employment
Employment Rate
61.84%
Education
Education
Bachelor's Degree+
36.96%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 73 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:73 ZIP Codes (36 Standard, 25 PO Box, 12 Unique) [See All]
Area Code:502
Timezone:Eastern (GMT -05:00)
Local Time:2:12:19 PM
Population:809,701 [See All]
FIPS:21111
CBSA:Louisville/Jefferson County, KY-IN
Land Area:442 sq mi
Water Area:5 sq mi
Coordinates:38.2085, -85.6953
Quick Link:
https://www.zip-codes.com/county/ky-jefferson.asp
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Kentucky's largest county
809,701 residents — the most of 120 counties in Kentucky.
Kentucky's densest county
1,830 people per square mile.
Sharp income gradient
Wealthiest ZIP earns 5.0× the poorest — $152,727 vs $30,794.
Extreme geographic sprawl
The largest ZIP spans 436× the smallest by area — 54.5 sq mi down to 0.13.
Extreme education divide
Bachelor's share ranges 8.4% to 70.1% across ZIPs — a 62-point gap.

Standout ZIPs in this County


Most Populous
Louisville · 45,405 people
5.6% of county total
Highest Income
Prospect · $152,727 median
1.9× county average
Largest Land Area
Louisville · 54.5 sq mi
Spans the most ground
Fastest Growth
Fisherville · 49.4% (10-yr)
4,598 → 6,870 residents
Most Educated
Prospect · 70.1% bachelor's+
10,354 of 14,765 adults 25+

Things worth knowing about Jefferson County


809,701 residents live across 73 ZIPs covering 442 sq mi, served by 8 distinct USPS-recognized cities.

Population moved from 778,479 to 809,701 from 2014 to 2024 — a +4.0% change. 24 ZIPs gained residents, 13 lost (and 1 held flat).

The county's wealthiest ZIP 40059 (Prospect, $152,727 median) and poorest ZIP 40203 (Louisville, $30,794) are 13.6 miles apart — a 5.0× income gap across local geography.

Median home values vary 6.4× across this county — from $87,600 in 40212 (Louisville) to $559,300 in 40059 (Prospect).

Density varies 23× across the county — from 281 people/sq mi in 40023 (Fisherville) to 6,459 in 40208 (Louisville).

Educational attainment ranges from 8.4% bachelor's+ in 40210 (Louisville) to 70.1% in 40059 (Prospect) — the breadth of educational profiles across the area.

Within Kentucky, this is the #1 most populous of 120 counties and ranks #9 for median household income .

On the national stage, Jefferson County is the #80 most populous US county .

Hosts 4 single-entity Unique ZIPs: 40292Univ Of Louisville ; 40280So Baptist Theo Sem ; 40282Pleasure Ridge Park ; and 40297Louisville .

Weighted by population, the typical household earns about $74,793 across the county — reflecting what a typical resident sees, not a simple ZIP average.

37.0% of adults age 25+ hold a bachelor's degree or higher (207,795 of 562,146 reporting). The most-educated ZIPs cluster around Louisville.

36 Standard delivery, 25 PO Box only, 12 single-entity Unique ZIPs serve this county.

Stories about Jefferson County


Higher-education hub

4 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.

Prospect
70.1%
20,892 residents
Louisville
68.2%
28,903 residents
Louisville
66.7%
24,664 residents
Louisville
61.3%
14,034 residents

Single-entity addresses

12 ZIP codes in this county serve a single facility — typically theme parks, universities, large corporations, airports, or government complexes.

So Baptist Theo Sem
182 residents
Pleasure Ridge Park
non-residential
Louisville
non-residential
Louisville
non-residential
National City Bank
non-residential
Pleasure Ridge Park
non-residential
Ky Lottery Corp
non-residential
Univ Of Louisville
non-residential
Louisville
non-residential
Pleasure Ridge Park
non-residential
Rr Donnelly
non-residential
General Electric Co
non-residential

Two counties in one

Median household income spans 5.0× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.

Wealthiest ZIP
Prospect
Median income: $152,727
Population: 20,892
Bachelor's+: 70.1%
vs
Poorest ZIP (pop >= 500)
Louisville
Median income: $30,794
Population: 17,742
Bachelor's+: 22.5%
For every $1 of household income in 40203, the typical household in 40059 earns $4.96.

All ZIP Codes in Jefferson County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
40214LouisvilleStandard45,405$54,93115.0-0.8%
40216LouisvilleStandard44,047$56,44117.67.8%
40299LouisvilleStandard42,207$89,44054.58.4%
40229LouisvilleStandard41,299$79,93617.913.0%
40291LouisvilleStandard41,222$81,26723.317.4%
40219LouisvilleStandard39,909$55,72014.50.7%
40245LouisvilleStandard39,835$122,94833.624.7%
40272LouisvilleStandard38,289$69,94035.9-1.2%
40220LouisvilleStandard35,078$78,4347.63.3%
40218LouisvilleStandard33,736$58,8119.111.7%
40241LouisvilleStandard30,696$94,07813.62.6%
40207LouisvilleStandard28,903$101,89812.5-4.4%
40258LouisvilleStandard26,841$68,16213.1-1.4%
40205LouisvilleStandard24,664$99,9667.22.5%
40223LouisvilleStandard22,798$96,60712.46.1%
40222LouisvilleStandard21,470$82,51111.81.2%
40059ProspectStandard20,892$152,72732.717.5%
40215LouisvilleStandard20,532$43,7253.5-8.1%
40211LouisvilleStandard20,407$31,7496.9-13.6%
40206LouisvilleStandard20,161$75,7987.04.6%
40228LouisvilleStandard18,085$79,4048.613.0%
40203LouisvilleStandard17,742$30,7943.2-3.3%
40213LouisvilleStandard16,054$55,89710.41.4%
40208LouisvilleStandard15,605$39,5602.40.8%
40212LouisvilleStandard14,661$35,7536.2-15.3%
40204LouisvilleStandard14,034$71,1162.9-1.4%
40210LouisvilleStandard13,518$35,3473.2-11.4%
40243LouisvilleStandard12,002$77,5873.913.6%
40217LouisvilleStandard11,663$69,1142.5-10.8%
40242LouisvilleStandard11,168$75,4172.7-1.5%
40118FairdaleStandard10,697$59,31615.19.5%
40202LouisvilleStandard7,261$35,5842.512.3%
40023FishervilleStandard6,870$144,63524.449.4%
40209LouisvilleStandard6394.231.8%
40025GlenviewPO Box565$250,0010.2874.1%
40041Masonic HomeStandard564$153,2140.1103.6%
40280LouisvilleUnique1820.0-66.0%
40231LouisvillePO Box00.1
40221LouisvillePO Box00.0
40293LouisvilleStandard0.0
40259LouisvillePO Box0.0
40282LouisvilleUnique0.0
40268LouisvillePO Box0.0
40297LouisvilleUnique0.0
40294LouisvilleUnique0.0
40285LouisvillePO Box0.0
40289LouisvilleUnique0.0
40283LouisvilleUnique0.0
40257LouisvillePO Box0.0
40287LouisvilleUnique0.0
40269LouisvillePO Box0.0
40224LouisvillePO Box0.0
40290LouisvillePO Box0.0
40292LouisvilleUnique0.2
40232LouisvillePO Box0.0
40252LouisvillePO Box0.0
40296LouisvilleUnique0.0
40298LouisvillePO Box0.0
40295LouisvillePO Box0.0
40027Harrods CreekPO Box0.0
40255LouisvillePO Box0.0
40201LouisvillePO Box0.0
40261LouisvillePO Box0.0
40281LouisvilleUnique0.0
40256LouisvillePO Box0.0
40250LouisvillePO Box0.0
40018EastwoodPO Box0.0
40266LouisvilleUnique0.0
40251LouisvillePO Box0.0
40253LouisvillePO Box0.0
40270LouisvillePO Box0.0
40225LouisvilleUnique0.0
40233LouisvillePO Box0.0

Adjacent & Nearby Counties