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

01731 (Hanscom Afb), at 25.0 (±5.3), among 82 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 Middlesex County, MA

These are the 25 ZIP codes in Middlesex County with the lowest median age, out of 82 with at least 1,000 residents. 01731 (Hanscom Afb, 25.0), 02467 (Chestnut Hill, 26.5) and 02138 (Cambridge, 28.3) lead the list. There is no single "best" ZIP code in Middlesex 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 Middlesex County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	01731	Hanscom Afb	25.0 ±5.3	2,110	680	729
2	02467	Chestnut Hill	26.5 ±2.9	23,001	6,852	7,378
3	02138	Cambridge	28.3 ±0.8	38,509	14,169	16,017
4	02139	Cambridge	30.0 ±0.6	40,033	16,012	15,488
5	02142	Cambridge	30.9 ±1.3	4,737	2,153	3,296
6	02141	Cambridge	31.2 ±1.0	14,517	7,270	8,115
7	02452	Waltham	31.6 ±3.0	15,808	5,362	5,358
8	02144	Somerville	31.8 ±0.9	25,448	11,357	10,806
9	02143	Somerville	32.1 ±1.0	25,513	12,283	12,595
10	02453	Waltham	32.7 ±1.2	31,591	12,610	12,835
11	01854	Lowell	32.8 ±1.4	30,081	10,602	10,323
12	02145	Somerville	33.3 ±1.0	27,495	11,940	12,071
13	01850	Lowell	33.4 ±2.2	17,740	6,089	5,825
14	02140	Cambridge	33.9 ±1.4	21,204	9,944	10,608
15	01702	Framingham	34.8 ±1.2	39,789	14,289	15,746
16	02155	Medford	34.9 ±0.7	61,730	24,370	25,052
17	02149	Everett	35.2 ±1.5	50,045	17,466	19,531
18	02148	Malden	35.8 ±1.0	65,906	26,042	26,642
19	01851	Lowell	36.4 ±1.1	33,403	11,421	11,087
20	02466	Auburndale	36.6 ±3.1	8,679	3,043	3,139
21	01752	Marlborough	37.5 ±1.3	41,647	16,665	18,512
22	01852	Lowell	38.2 ±1.1	37,144	15,071	15,339
23	01469	Townsend	38.7 ±3.9	6,820	2,583	2,665
24	02474	Arlington	38.9 ±1.4	28,642	12,182	12,394
25	01432	Ayer	39.0 ±2.7	8,521	3,567	3,768

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; 82 of 83 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 39,866 households, on 84 carrier routes with 42,908 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 01731 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 Middlesex County has the lowest median age?: 01731 (Hanscom Afb), at 25.0 (±5.3), among 82 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.