Which ZIP code in Jefferson County has the fastest population growth?

40023 (Fisherville), at 27.9%, 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.

Fastest-growing ZIP codes in Jefferson County, KY

These are the 25 ZIP codes in Jefferson County with the fastest population growth, out of 33 with at least 1,000 residents. 40023 (Fisherville, 27.9%), 40245 (Louisville, 15.4%) and 40118 (Fairdale, 14.9%) 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.

Fastest-growing ZIP codes in Jefferson County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	40023	Fisherville	27.9%	6,870	2,489	2,716
2	40245	Louisville	15.4%	39,835	15,048	—
3	40118	Fairdale	14.9%	10,697	4,244	4,662
4	40243	Louisville	14.5%	12,002	5,741	—
5	40228	Louisville	13.5%	18,085	7,279	8,542
6	40291	Louisville	9.0%	41,222	16,591	—
7	40229	Louisville	5.1%	41,299	15,630	17,185
8	40059	Prospect	5.1%	20,892	8,250	9,323
9	40216	Louisville	4.8%	44,047	17,342	19,299
10	40220	Louisville	3.1%	35,078	15,591	15,976
11	40206	Louisville	2.4%	20,161	10,576	11,477
12	40241	Louisville	2.1%	30,696	13,288	14,672
13	40299	Louisville	1.8%	42,207	17,163	19,657
14	40242	Louisville	0.9%	11,168	5,010	4,906
15	40202	Louisville	0.9%	7,261	3,363	4,031
16	40205	Louisville	0.8%	24,664	10,476	10,794
17	40258	Louisville	0.6%	26,841	10,684	11,386
18	40272	Louisville	0.5%	38,289	14,313	16,196
19	40218	Louisville	0.2%	33,736	13,474	14,126
20	40203	Louisville	-0.4%	17,742	8,911	9,395
21	40219	Louisville	-0.5%	39,909	16,186	17,521
22	40214	Louisville	-1.0%	45,405	18,443	19,980
23	40215	Louisville	-1.1%	20,532	8,207	9,265
24	40213	Louisville	-1.5%	16,054	7,320	7,579
25	40223	Louisville	-2.4%	22,798	9,971	11,261

How we ranked them

Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have at least 1,000 residents. ZIP codes need at least 1,000 residents to be ranked; 33 of 39 qualify.

Which of these to mail, and why

Growing ZIP codes add households every year, which means new homes, new routes and customers without a go-to provider yet. Check the route map: new subdivisions can appear as new carrier routes.

The top five ZIP codes on this list hold 34,801 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 40023 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 fastest population growth?: 40023 (Fisherville), at 27.9%, among 33 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have 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.

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