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 Louisville/Jefferson County metro government (balance), KY

These are the 22 ZIP codes in Louisville/Jefferson County metro government (balance), KY with the lowest median age, out of 22 with at least 1,000 residents. 40218 (Louisville, 33.2), 40219 (Louisville, 35.1) and 40214 (Louisville, 35.4) lead the list. There is no single "best" ZIP code in Louisville/Jefferson County metro government (balance); the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Youngest ZIP codes in Louisville/Jefferson County metro government (balance)

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	40218	Louisville	33.2 ±1.2	33,736	13,474	14,126
2	40219	Louisville	35.1 ±1.9	39,909	16,186	17,521
3	40214	Louisville	35.4 ±1.6	45,405	18,443	19,980
4	40229	Louisville	36.2 ±1.5	41,299	15,630	17,185
5	40118	Fairdale	37.1 ±2.2	10,697	4,244	4,662
6	40242	Louisville	37.5 ±2.7	11,168	5,010	4,906
7	40272	Louisville	38.2 ±1.3	38,289	14,313	16,196
8	40216	Louisville	38.9 ±2.4	44,047	17,342	19,299
9	40213	Louisville	39.0 ±2.9	16,054	7,320	7,579
10	40291	Louisville	39.1 ±2.0	41,222	16,591	—
11	40211	Louisville	39.1 ±4.0	20,407	8,781	9,572
12	40220	Louisville	39.3 ±2.3	35,078	15,591	15,976
13	40222	Louisville	39.6 ±2.6	21,470	10,047	11,627
14	40299	Louisville	40.0 ±2.0	42,207	17,163	19,657
15	40228	Louisville	40.5 ±3.5	18,085	7,279	8,542
16	40258	Louisville	40.7 ±2.2	26,841	10,684	11,386
17	40245	Louisville	40.8 ±1.8	39,835	15,048	—
18	40207	Louisville	41.2 ±1.3	28,903	13,759	14,842
19	40241	Louisville	42.1 ±1.8	30,696	13,288	14,672
20	40223	Louisville	43.1 ±2.2	22,798	9,971	11,261
21	40023	Fisherville	44.6 ±4.3	6,870	2,489	2,716
22	40059	Prospect	47.2 ±1.5	20,892	8,250	9,323

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; 22 of 23 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 67,977 households, on 110 carrier routes with 73,474 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 40218 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 Louisville/Jefferson County metro government (balance) has the lowest median age?: 40218 (Louisville), at 33.2 (±1.2), among 22 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.