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

46320 (Hammond), at 32.6 (±1.7), 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.

Youngest ZIP codes in Lake County, IN

These are the 25 ZIP codes in Lake County with the lowest median age, out of 26 with at least 1,000 residents. 46320 (Hammond, 32.6), 46406 (Gary, 33.4) and 46402 (Gary, 33.5) 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.

Youngest ZIP codes in Lake County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	46320	Hammond	32.6 ±1.7	14,353	5,480	5,542
2	46406	Gary	33.4 ±5.2	9,001	3,487	3,608
3	46402	Gary	33.5 ±2.5	5,836	2,258	2,578
4	46409	Gary	34.7 ±4.5	7,184	2,648	2,974
5	46405	Lake Station	35.3 ±4.4	12,184	4,357	4,486
6	46327	Hammond	35.3 ±2.9	10,597	3,843	3,665
7	46323	Hammond	35.4 ±1.6	23,047	8,374	8,557
8	46312	East Chicago	36.5 ±1.6	26,022	9,943	9,179
9	46408	Gary	36.8 ±3.3	15,747	6,099	6,266
10	46407	Gary	36.9 ±2.6	8,577	3,778	4,540
11	46324	Hammond	37.8 ±2.3	21,409	8,767	8,673
12	46319	Griffith	37.8 ±1.6	17,847	7,615	7,764
13	46342	Hobart	39.4 ±1.9	32,224	13,053	13,324
14	46404	Gary	39.4 ±6.0	15,428	5,873	6,780
15	46303	Cedar Lake	40.1 ±2.0	17,680	6,385	8,131
16	46307	Crown Point	40.3 ±1.1	71,673	25,277	29,022
17	46394	Whiting	40.3 ±2.3	11,894	4,858	4,655
18	46403	Gary	40.4 ±5.2	10,929	4,950	5,631
19	46356	Lowell	41.1 ±2.9	19,721	7,078	8,122
20	46410	Merrillville	42.1 ±2.0	39,243	16,859	17,463
21	46311	Dyer	43.7 ±1.9	23,321	8,835	9,378
22	46373	Saint John	44.4 ±3.3	18,843	6,658	7,611
23	46341	Hebron	44.4 ±2.8	10,048	3,964	4,111
24	46322	Highland	44.6 ±1.9	23,680	10,440	10,386
25	46321	Munster	45.0 ±1.6	23,733	9,471	9,475

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; 26 of 28 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 18,230 households, on 33 carrier routes with 19,188 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 46320 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 lowest median age?: 46320 (Hammond), at 32.6 (±1.7), among 26 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.