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US ZIP Code Profile

ZIP Code 40203
Louisville, Kentucky

ZIP code 40203 is in Louisville, located in Jefferson County, Kentucky, within the Louisville/Jefferson County metro area. Its 2020 Census population was 16,801. The estimated median adjusted gross income per tax return is $25,967, and about 1% of filers report $200,000 or more.

2020 Population
16,801
Census ZCTA
County
Jefferson
FIPS 21111
Median income (est.)
$25,967
IRS SOI 2022
Land Area
2.941 mi²
+ 0 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityLouisville, KY
CountyJefferson County (FIPS 21111)
StateKentucky (FIPS 21)
Metro Area (MSA)Louisville/Jefferson County, KY-IN Metro Area (31140)
Census Region / DivisionSouth Region · East South Central Division
Coordinates38.252697, -85.76517
Land / Water Area2.941 mi² land · 0 mi² water

02Income & Economics

Distribution of the 5,880 individual tax returns filed in 40203 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
48.8%
$25K–$50K
30.8%
$50K–$75K
11.2%
$75K–$100K
4.2%
$100K–$200K
3.9%
$200K+
1.0%
The $200,000+ bracket accounts for 10% of 40203's total adjusted gross income, from 1% of returns — a concentration that drives the gap between the median ($25,967) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 40203's IRS income metrics, 2020–2022.

Median income (2021→2022)
$25,967
▲ 10.8%
Filers earning $200K+
1.0%
▲ 0.0 pt
Total filers
5,880
▼ 1.7%
GET /zipc/v2/zipcodes/40203/soi?year=… $22K 2020 $23K 2021 $26K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 40203 ZCTA.

2000
20,837
 
2010
19,694
▼ -5.5%
2020
16,801
▼ -14.7%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 40203. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 40203

Louisville and its immediate neighbors, sorted by distance.

3 mi
GET /zipc/v2/distance

Distance from 40203 to any ZIP

Enter a 5-digit ZIP to calculate the distance.

06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number204788
City AliasesLouisville

07Frequently Asked Questions

What county is ZIP code 40203 in?

ZIP code 40203 is in Jefferson County, Kentucky (county FIPS code 21111).

What city is ZIP code 40203?

The primary USPS city for 40203 is Louisville, KY.

What metro area (MSA) is 40203 in?

40203 is part of the Louisville/Jefferson County, KY-IN Metro Area (MSA code 31140).

What is the population of ZIP code 40203?

The 2020 Census population of 40203 was 16,801 residents.

What is the median income in ZIP code 40203?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 40203 is about $25,967, with around 1% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.