What city is 40204 in?

40204 is a Louisville, KY mailing address. By land area, 100% lies inside Louisville.

What is the population of 40204?

About 14,034 people (±1,009), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 14,600.

What is the median household income in 40204?

$71,116 (±$6,745), compared with $63,726 for Kentucky as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 40204?

16 USPS carrier routes with 8,190 residential and 720 business mailboxes (8,910 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 40204?

The closest, measured center to center: 40206 (1.6 mi, Louisville), 40217 (1.8 mi, Louisville), 40202 (1.9 mi, Louisville), 40280 (2 mi, Louisville), 40205 (2.4 mi, Louisville) and 40203 (2.5 mi, Louisville).

40204 ZIP Code, Louisville, KY

40204 is a ZIP code in Louisville, Kentucky in Jefferson County. It covers 3.2 square miles of land. The closest ZIP codes are 40206, 40217 and 40202. 14,034 people live here in 7,731 households. At about 4,422 people per square mile it is built up to city-neighborhood density, and owners and renters are mixed (49% own). Median household income is $71,116, above the Kentucky median of $63,726; 22% of residents moved in during the past year.

Quick facts

Mailing city: Louisville, KY
County: Jefferson County
Land area: 3.2 sq mi
Population: 14,034
Median household income: $71,116
Carrier routes: 16 (8,190 homes)

Key figures

Measure	Value
Residents	14,034
Households	7,731
Median household income	$71,116
Income per person	$64,676
Median age	39
Homeowners	49.4%
Median home value	$329,000
Median rent	$1,287
Bachelor's degree or higher	61.3%
Average commute (minutes)	17.7
Households with kids under 18	13.5%
Moved in the past year	21.6%
Below the poverty line	11.3%
Broadband internet	95.3%
Speak a non-English language at home	5.0%

Household income

% of households	Value
<$10K	3.9%
$10–15K	2.6%
$15–25K	5.3%
$25–35K	5.8%
$35–50K	13.3%
$50–75K	21.9%
$75–100K	10.0%
$100–150K	17.6%
$150–200K	6.7%
$200K+	12.9%

Age

% of all residents	Value
<10	6.3%
10–19	6.1%
20–24	8.3%
25–34	22.5%
35–44	14.8%
45–54	14.1%
55–64	10.5%
65–74	10.7%
75+	6.6%

Tenure

% of housing units	Value
Owned, with mortgage	28.2%
Owned outright	15.9%
Rented	43.8%
Vacant	12.2%

Type of building

% of housing units	Value
Detached house	49.9%
Townhome	0.7%
2–4 units	19.8%
5–19 units	17.5%
20+ units	12.0%
Mobile / other	0.0%

Businesses in 40204

543 business establishments with 7,104 employees (ZIP Codes Business Patterns 2023).

Accommodation and Food Services: 98
Professional, Scientific, and Technical Services: 82
Retail Trade: 68
Health Care and Social Assistance: 65
Other Services (except Public Administration): 55
Real Estate and Rental and Leasing: 34
Wholesale Trade: 26
Manufacturing: 24

EDDM carrier routes

40204 has 16 USPS carrier routes with 8,190 residential and 720 business mailboxes. Open the EDDM route map.

Carrier routes in 40204

40204 has 16 USPS carrier routes (16 city (C)) with 8,190 residential and 720 business mailboxes. Routes range from 294 homes (C046) to 703 homes (C038); the median route has 498 homes. The Census counted 7,731 households in 40204 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	8
500–749	8
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 40204 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route C022 — USPS business mailboxes 106, 490 homes
Route C025 — USPS business mailboxes 90, 503 homes
Route C027 — USPS business mailboxes 88, 484 homes
Route C013 — USPS business mailboxes 81, 664 homes
Route C033 — USPS business mailboxes 78, 418 homes

Select these 5 routes on the route map

Every carrier route in 40204

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	530	73	$37,017	—	—	—
C004	City	492	2	$104,811	—	—	—
C013	City	664	81	$44,478	—	—	—
C022	City	490	106	$64,808	—	—	—
C025	City	503	90	$100,093	—	—	—
C026	City	531	64	$14,281	—	—	—
C027	City	484	88	$37,492	—	—	—
C030	City	461	8	$104,811	—	—	—
C032	City	313	3	$67,740	—	—	—
C033	City	418	78	$107,932	—	—	—
C035	City	639	27	$56,808	—	—	—
C036	City	580	9	$72,798	—	—	—
C038	City	703	60	$78,557	—	—	—
C044	City	655	22	$54,055	—	—	—
C045	City	433	3	$98,569	—	—	—
C046	City	294	6	$54,924	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 40204 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

40206 — Louisville city, KY (1.6 mi)
40217 — Louisville city, KY (1.8 mi)
40202 — Louisville city, KY (1.9 mi)
40280 — Louisville city, KY (2 mi)
40205 — Louisville city, KY (2.4 mi)
40203 — Louisville city, KY (2.5 mi)
40208 — Louisville city, KY (2.8 mi)
40041 — Louisville city, KY (3.3 mi)

Areas that include 40204

Louisville, KY ZIP codes — 35 ZIP codes
Jefferson County ZIP codes — 39 ZIP codes
Kentucky ZIP code data

Where it ranks

Mail every home in 40204

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

Louisville EDDM mailing

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 40204, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 40204 in?: 40204 is a Louisville, KY mailing address. By land area, 100% lies inside Louisville.
What county is 40204 in?: 40204 is in Jefferson County.
What is the population of 40204?: About 14,034 people (±1,009), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 14,600.
What is the median household income in 40204?: $71,116 (±$6,745), compared with $63,726 for Kentucky as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 40204?: 16 USPS carrier routes with 8,190 residential and 720 business mailboxes (8,910 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 40204?: The closest, measured center to center: 40206 (1.6 mi, Louisville), 40217 (1.8 mi, Louisville), 40202 (1.9 mi, Louisville), 40280 (2 mi, Louisville), 40205 (2.4 mi, Louisville) and 40203 (2.5 mi, Louisville).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.