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

40243 (Louisville), at 48.0 (±3.2), 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.

Oldest ZIP codes in Jefferson County, KY

These are the 25 ZIP codes in Jefferson County with the highest median age, out of 33 with at least 1,000 residents. 40243 (Louisville, 48.0), 40059 (Prospect, 47.2) and 40023 (Fisherville, 44.6) 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.

Oldest ZIP codes in Jefferson County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	40243	Louisville	48.0 ±3.2	12,002	5,741	—
2	40059	Prospect	47.2 ±1.5	20,892	8,250	9,323
3	40023	Fisherville	44.6 ±4.3	6,870	2,489	2,716
4	40223	Louisville	43.1 ±2.2	22,798	9,971	11,261
5	40205	Louisville	42.7 ±1.3	24,664	10,476	10,794
6	40241	Louisville	42.1 ±1.8	30,696	13,288	14,672
7	40202	Louisville	41.9 ±3.4	7,261	3,363	4,031
8	40207	Louisville	41.2 ±1.3	28,903	13,759	14,842
9	40245	Louisville	40.8 ±1.8	39,835	15,048	—
10	40258	Louisville	40.7 ±2.2	26,841	10,684	11,386
11	40228	Louisville	40.5 ±3.5	18,085	7,279	8,542
12	40212	Louisville	40.1 ±3.2	14,661	6,444	6,942
13	40299	Louisville	40.0 ±2.0	42,207	17,163	19,657
14	40222	Louisville	39.6 ±2.6	21,470	10,047	11,627
15	40220	Louisville	39.3 ±2.3	35,078	15,591	15,976
16	40291	Louisville	39.1 ±2.0	41,222	16,591	—
17	40211	Louisville	39.1 ±4.0	20,407	8,781	9,572
18	40213	Louisville	39.0 ±2.9	16,054	7,320	7,579
19	40204	Louisville	39.0 ±1.7	14,034	7,731	8,190
20	40216	Louisville	38.9 ±2.4	44,047	17,342	19,299
21	40206	Louisville	38.4 ±1.3	20,161	10,576	11,477
22	40272	Louisville	38.2 ±1.3	38,289	14,313	16,196
23	40242	Louisville	37.5 ±2.7	11,168	5,010	4,906
24	40210	Louisville	37.2 ±2.6	13,518	5,612	6,280
25	40217	Louisville	37.2 ±2.4	11,663	6,407	6,215

How we ranked them

Ranked by median age of all residents, highest 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

Older ZIP codes respond to health care, hearing and vision, Medicare plans, home safety, estate planning and services that come to the door.

The top five ZIP codes on this list hold 36,927 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 40243 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

Map it and price it

EDDM guides

Frequently asked questions

Which ZIP code in Jefferson County has the highest median age?: 40243 (Louisville), at 48.0 (±3.2), among 33 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, highest 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.