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

46303 (Cedar Lake), at 19.7%, among 26 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 Lake County, IN

These are the 25 ZIP codes in Lake County with the fastest population growth, out of 26 with at least 1,000 residents. 46303 (Cedar Lake, 19.7%), 46373 (Saint John, 17.2%) and 46307 (Crown Point, 14.2%) lead the list. There is no single "best" ZIP code in Lake 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 Lake County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	46303	Cedar Lake	19.7%	17,680	6,385	8,131
2	46373	Saint John	17.2%	18,843	6,658	7,611
3	46307	Crown Point	14.2%	71,673	25,277	29,022
4	46405	Lake Station	12.2%	12,184	4,357	4,486
5	46356	Lowell	11.3%	19,721	7,078	8,122
6	46311	Dyer	7.8%	23,321	8,835	9,378
7	46320	Hammond	5.8%	14,353	5,480	5,542
8	46322	Highland	4.9%	23,680	10,440	10,386
9	46321	Munster	4.6%	23,733	9,471	9,475
10	46342	Hobart	4.4%	32,224	13,053	13,324
11	46410	Merrillville	3.8%	39,243	16,859	17,463
12	46323	Hammond	3.8%	23,047	8,374	8,557
13	46375	Schererville	2.5%	24,188	10,079	10,610
14	46319	Griffith	1.9%	17,847	7,615	7,764
15	46408	Gary	1.4%	15,747	6,099	6,266
16	46409	Gary	-0.3%	7,184	2,648	2,974
17	46406	Gary	-0.5%	9,001	3,487	3,608
18	46324	Hammond	-1.9%	21,409	8,767	8,673
19	46341	Hebron	-3.0%	10,048	3,964	4,111
20	46394	Whiting	-3.4%	11,894	4,858	4,655
21	46402	Gary	-7.3%	5,836	2,258	2,578
22	46327	Hammond	-7.6%	10,597	3,843	3,665
23	46312	East Chicago	-7.7%	26,022	9,943	9,179
24	46404	Gary	-13.8%	15,428	5,873	6,780
25	46403	Gary	-18.7%	10,929	4,950	5,631

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; 26 of 28 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 49,755 households, on 90 carrier routes with 57,372 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 46303 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 Lake County has the fastest population growth?: 46303 (Cedar Lake), at 19.7%, among 26 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.