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

04864 (Warren), at 42.2 (±2.2), among 14 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 Knox County, ME

These are the 14 ZIP codes in Knox County with the lowest median age, out of 14 with at least 1,000 residents. 04864 (Warren, 42.2), 04862 (Union, 43.2) and 04847 (Hope, 44.6) lead the list. There is no single "best" ZIP code in Knox 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 Knox County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	04864	Warren	42.2 ±2.2	4,932	1,645	1,636
2	04862	Union	43.2 ±4.5	4,023	1,725	1,425
3	04847	Hope	44.6 ±3.1	1,748	695	219
4	04574	Washington	48.2 ±6.7	1,624	684	689
5	04856	Rockport	48.7 ±3.7	3,675	1,498	1,574
6	04563	Cushing	48.8 ±7.7	1,460	686	513
7	04841	Rockland	49.3 ±6.0	7,035	3,565	3,613
8	04843	Camden	52.2 ±6.5	5,242	2,474	2,703
9	04854	Owls Head	52.6 ±6.6	1,482	669	766
10	04860	Tenants Harbor	53.1 ±3.3	1,543	816	635
11	04858	South Thomaston	54.1 ±11.2	1,378	608	562
12	04547	Friendship	55.5 ±6.9	1,213	553	447
13	04861	Thomaston	58.1 ±6.6	2,769	1,420	1,245
14	04863	Vinalhaven	65.1 ±3.9	1,216	628	423

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; 14 of 19 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 6,247 households, on 13 carrier routes with 5,543 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 04864 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 Knox County has the lowest median age?: 04864 (Warren), at 42.2 (±2.2), among 14 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.