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

04421 (Castine), at 21.2 (±0.7), among 18 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 Hancock County, ME

These are the 18 ZIP codes in Hancock County with the lowest median age, out of 18 with at least 1,000 residents. 04421 (Castine, 21.2), 04605 (Ellsworth, 44.0) and 04429 (Holden, 45.3) lead the list. There is no single "best" ZIP code in Hancock 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 Hancock County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	04421	Castine	21.2 ±0.7	1,362	352	110
2	04605	Ellsworth	44.0 ±1.9	14,529	6,414	7,111
3	04429	Holden	45.3 ±2.5	5,008	2,235	2,010
4	04416	Bucksport	46.1 ±10.6	5,497	2,589	2,062
5	04664	Sullivan	47.1 ±15.0	1,246	532	536
6	04614	Blue Hill	48.6 ±8.2	2,813	1,308	1,024
7	04679	Southwest Harbor	48.9 ±9.3	1,553	731	456
8	04609	Bar Harbor	49.2 ±5.9	5,244	2,479	2,870
9	04634	Franklin	49.9 ±5.5	2,374	1,055	886
10	04472	Orland	51.2 ±3.5	1,852	890	883
11	04676	Sedgwick	52.1 ±4.0	1,130	532	511
12	04684	Surry	52.4 ±5.6	1,836	841	737
13	04660	Mount Desert	52.4 ±8.6	1,072	517	526
14	04476	Penobscot	53.4 ±5.7	1,154	531	569
15	04627	Deer Isle	53.9 ±4.7	2,137	909	768
16	04640	Hancock	54.8 ±7.5	2,450	1,117	1,115
17	04607	Gouldsboro	56.5 ±6.0	1,142	564	565
18	04622	Cherryfield	57.3 ±3.3	1,050	505	571

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; 18 of 41 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 12,122 households, on 22 carrier routes with 11,829 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 04421 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 Hancock County has the lowest median age?: 04421 (Castine), at 21.2 (±0.7), among 18 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.