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

83712 (Boise), at 46.9 (±3.1), among 17 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 Ada County, ID

These are the 17 ZIP codes in Ada County with the highest median age, out of 17 with at least 1,000 residents. 83712 (Boise, 46.9), 83616 (Eagle, 46.5) and 83714 (Garden City, 42.6) lead the list. There is no single "best" ZIP code in Ada 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 Ada County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	83712	Boise	46.9 ±3.1	9,071	4,432	4,418
2	83616	Eagle	46.5 ±2.7	35,413	13,556	15,970
3	83714	Garden City	42.6 ±2.5	27,564	11,725	13,441
4	83641	Melba	42.6 ±3.4	4,061	1,395	—
5	83703	Boise	42.3 ±2.0	17,583	7,871	—
6	83702	Boise	41.8 ±1.8	24,163	12,076	13,498
7	83716	Boise	41.8 ±1.7	21,402	8,502	10,148
8	83669	Star	40.9 ±3.8	16,827	5,879	—
9	83713	Boise	39.9 ±1.6	31,549	11,950	—
10	83704	Boise	38.6 ±1.4	42,719	17,495	18,137
11	83642	Meridian	37.9 ±1.5	62,279	23,827	29,628
12	83646	Meridian	37.4 ±1.0	76,023	26,956	29,482
13	83709	Boise	36.9 ±0.9	58,928	21,651	—
14	83705	Boise	36.4 ±1.9	26,830	12,540	—
15	83634	Kuna	34.6 ±1.1	36,286	10,535	13,193
16	83687	Nampa	33.8 ±1.0	43,135	14,967	—
17	83706	Boise	30.5 ±2.1	35,524	14,799	17,057

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; 17 of 19 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 38,979 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 83712 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 Ada County has the highest median age?: 83712 (Boise), at 46.9 (±3.1), among 17 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.