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

60096 (Winthrop Harbor), at 53.3 (±5.6), among 30 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 Lake County, IL

These are the 25 ZIP codes in Lake County with the highest median age, out of 30 with at least 1,000 residents. 60096 (Winthrop Harbor, 53.3), 60069 (Lincolnshire, 50.6) and 60045 (Lake Forest, 45.9) 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.

Oldest ZIP codes in Lake County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	60096	Winthrop Harbor	53.3 ±5.6	6,527	2,854	2,689
2	60069	Lincolnshire	50.6 ±3.1	8,502	3,424	3,665
3	60045	Lake Forest	45.9 ±2.2	21,074	7,470	8,247
4	60010	Barrington	45.7 ±1.3	45,747	16,529	18,098
5	60035	Highland Park	45.0 ±2.4	30,398	11,787	12,443
6	60020	Fox Lake	44.8 ±5.8	10,970	5,120	5,643
7	60015	Deerfield	44.6 ±1.5	28,096	10,346	10,487
8	60044	Lake Bluff	44.6 ±2.6	10,312	4,159	4,282
9	60051	Mchenry	44.5 ±1.7	24,621	10,054	10,708
10	60083	Wadsworth	43.9 ±4.6	9,981	3,662	3,582
11	60081	Spring Grove	42.9 ±7.4	9,088	3,335	3,615
12	60047	Lake Zurich	42.6 ±0.9	44,240	15,581	15,687
13	60048	Libertyville	42.3 ±1.8	29,124	10,493	11,377
14	60089	Buffalo Grove	42.0 ±1.0	42,872	16,206	16,995
15	60061	Vernon Hills	41.9 ±1.6	27,974	11,343	11,714
16	60030	Grayslake	41.8 ±1.6	35,792	14,391	15,030
17	60002	Antioch	41.0 ±1.9	24,232	9,319	10,506
18	60040	Highwood	41.0 ±6.0	5,301	2,025	1,873
19	60031	Gurnee	40.4 ±1.6	37,107	14,307	15,133
20	60084	Wauconda	39.8 ±3.3	17,192	6,361	6,685
21	60041	Ingleside	39.8 ±3.0	9,024	3,706	3,887
22	60042	Island Lake	39.4 ±2.3	8,347	3,088	3,432
23	60060	Mundelein	39.3 ±1.4	37,344	13,542	14,463
24	60046	Lake Villa	38.4 ±1.4	34,613	12,064	13,251
25	60087	Waukegan	37.6 ±2.6	27,293	10,192	10,127

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; 30 of 31 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 42,064 households, on 125 carrier routes with 45,142 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 60096 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Lake County has the highest median age?: 60096 (Winthrop Harbor), at 53.3 (±5.6), among 30 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.