Which ZIP code in Jefferson County has the lowest median age?

40208 (Louisville), at 23.3 (±1.4), among 33 ZIP codes with at least 1,000 residents.

Why are some ZIP codes missing?

ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.

Youngest ZIP codes in Jefferson County, KY

These are the 25 ZIP codes in Jefferson County with the lowest median age, out of 33 with at least 1,000 residents. 40208 (Louisville, 23.3), 40203 (Louisville, 32.8) and 40218 (Louisville, 33.2) lead the list. There is no single "best" ZIP code in Jefferson County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Youngest ZIP codes in Jefferson County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	40208	Louisville	23.3 ±1.4	15,605	5,813	5,502
2	40203	Louisville	32.8 ±2.2	17,742	8,911	9,395
3	40218	Louisville	33.2 ±1.2	33,736	13,474	14,126
4	40219	Louisville	35.1 ±1.9	39,909	16,186	17,521
5	40214	Louisville	35.4 ±1.6	45,405	18,443	19,980
6	40229	Louisville	36.2 ±1.5	41,299	15,630	17,185
7	40215	Louisville	37.1 ±2.7	20,532	8,207	9,265
8	40118	Fairdale	37.1 ±2.2	10,697	4,244	4,662
9	40210	Louisville	37.2 ±2.6	13,518	5,612	6,280
10	40217	Louisville	37.2 ±2.4	11,663	6,407	6,215
11	40242	Louisville	37.5 ±2.7	11,168	5,010	4,906
12	40272	Louisville	38.2 ±1.3	38,289	14,313	16,196
13	40206	Louisville	38.4 ±1.3	20,161	10,576	11,477
14	40216	Louisville	38.9 ±2.4	44,047	17,342	19,299
15	40213	Louisville	39.0 ±2.9	16,054	7,320	7,579
16	40204	Louisville	39.0 ±1.7	14,034	7,731	8,190
17	40291	Louisville	39.1 ±2.0	41,222	16,591	—
18	40211	Louisville	39.1 ±4.0	20,407	8,781	9,572
19	40220	Louisville	39.3 ±2.3	35,078	15,591	15,976
20	40222	Louisville	39.6 ±2.6	21,470	10,047	11,627
21	40299	Louisville	40.0 ±2.0	42,207	17,163	19,657
22	40212	Louisville	40.1 ±3.2	14,661	6,444	6,942
23	40228	Louisville	40.5 ±3.5	18,085	7,279	8,542
24	40258	Louisville	40.7 ±2.2	26,841	10,684	11,386
25	40245	Louisville	40.8 ±1.8	39,835	15,048	—

How we ranked them

Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 33 of 39 qualify.

Which of these to mail, and why

Younger ZIP codes skew toward renters, students and young families: fitness, quick-service food, apartments, entertainment and first-time-buyer offers.

The top five ZIP codes on this list hold 62,827 households, on 100 carrier routes with 66,524 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 40208 on the EDDM route map

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Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Jefferson County has the lowest median age?: 40208 (Louisville), at 23.3 (±1.4), among 33 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024).
Why are some ZIP codes missing?: ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.

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