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🇺🇸 United States ZIP Code

STANDARD

40203

Louisville

ZIP Code 40203 is a standard zip code serving Louisville, Louisville, Kentucky (KY), in Jefferson County, United States. It has an estimated population of 19,694 with a median household income of $15,535. The area falls within the America/Kentucky/Louisville timezone.

Median Household Income vs. National Average

$0 National: $37,585 $150K+ $15,535

Location

Country
🇺🇸 United States
State / Province
Kentucky (KY)
County
Jefferson
City
Louisville
Timezone
America/Kentucky/Louisville

Coordinates

Latitude
38.249300
Longitude
-85.769400

Geographic Details

Land Area
2.94 mi²
Population Density
6696.0 people per mi² (95th percentile)
Bounding Box
38.277035°N, 38.228358°S, -85.739087°E, -85.791246°W

With 19,694 residents spread across 2.94 square miles, this area has a population density of 6696.0 people per square mile.

Demographics

19,694

Population

80th percentile

$15,535

Median Income

$84,600

Median Home Value

20th percentile

2.94 mi²

Land Area

The median household income in 40203 is $15,535, and the median home value is $84,600.

Housing

11,014

Total Units

9,173

Occupied Units

83.3%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Louisville, KY.

40201

Louisville

 40202

Louisville

 40204

Louisville

 40205

Louisville

 40206

Louisville

 40207

Louisville

 40208

Louisville

 40209

Louisville

 40210

Louisville

 40211

Louisville

Similar ZIP Codes in Kentucky

ZIP codes with similar median household income in Kentucky.

40202

Louisville

$16,069

 40210

Louisville

$20,069

 40312

Clay City

$19,464

 40507

Lexington

$19,636

 40508

Lexington

$20,412

 40734

Gray

$18,436

 41180

Webbville

$17,799

 41553

Phelps

$19,248

Frequently Asked Questions

What information is available for each ZIP code?
Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).
What are the different types of ZIP codes?
There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.
How often is ZIP code data updated?
ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.
What is population density and why does it matter?
Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.
How are ZIP code boundaries determined?
ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.
What does median household income tell me about a ZIP code?
Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.