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

60416 (Coal City), at 42.2 (±3.2), among 9 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 Grundy County, IL

These are the 9 ZIP codes in Grundy County with the highest median age, out of 9 with at least 1,000 residents. 60416 (Coal City, 42.2), 60450 (Morris, 40.7) and 60420 (Dwight, 39.3) lead the list. There is no single "best" ZIP code in Grundy 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 Grundy County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	60416	Coal City	42.2 ±3.2	9,550	3,824	3,928
2	60450	Morris	40.7 ±1.8	20,783	8,741	8,883
3	60420	Dwight	39.3 ±5.9	4,682	1,901	2,134
4	60407	Braceville	39.2 ±6.6	1,812	649	574
5	61360	Seneca	37.9 ±10.2	3,610	1,363	1,032
6	60424	Gardner	37.5 ±4.9	2,153	812	864
7	60444	Mazon	37.2 ±5.0	1,901	703	406
8	60410	Channahon	37.1 ±3.6	14,239	4,679	5,219
9	60447	Minooka	33.6 ±2.0	16,102	5,321	5,129

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; 9 of 12 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 16,478 households, on 33 carrier routes with 16,551 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 60416 on the EDDM route map

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Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Grundy County has the highest median age?: 60416 (Coal City), at 42.2 (±3.2), among 9 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.