Which ZIP code in Middlesex County has the highest median household income?

06422 (Durham), at $158,857 (±$7,311), among 20 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.

Richest ZIP codes in Middlesex County, CT

These are the 20 ZIP codes in Middlesex County with the highest median household income, out of 20 with at least 1,000 residents. 06422 (Durham, $158,857), 06419 (Killingworth, $140,655) and 06413 (Clinton, $124,824) 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.

Richest ZIP codes in Middlesex County

Rank	ZIP	Mailing city	Median household income	Residents	Households	Residential mailboxes
1	06422	Durham	$158,857 ±$7,311	7,208	2,986	2,650
2	06419	Killingworth	$140,655 ±$16,359	6,240	2,516	2,607
3	06413	Clinton	$124,824 ±$13,697	13,377	5,509	5,974
4	06424	East Hampton	$123,680 ±$11,366	12,751	5,171	5,399
5	06415	Colchester	$123,256 ±$13,017	16,038	6,604	6,956
6	06438	Haddam	$121,429 ±$18,624	2,887	1,036	1,203
7	06480	Portland	$118,929 ±$15,490	9,434	3,762	4,042
8	06475	Old Saybrook	$114,333 ±$16,577	10,575	4,672	5,197
9	06441	Higganum	$111,250 ±$17,805	5,348	2,178	2,080
10	06416	Cromwell	$110,596 ±$9,921	14,334	5,763	6,385
11	06412	Chester	$109,191 ±$18,195	3,825	1,628	1,703
12	06423	East Haddam	$107,549 ±$18,943	5,182	2,137	2,066
13	06469	Moodus	$104,888 ±$16,355	3,311	1,263	1,301
14	06442	Ivoryton	$104,358 ±$11,012	2,826	1,149	1,062
15	06455	Middlefield	$104,180 ±$24,665	2,480	1,153	—
16	06426	Essex	$103,705 ±$27,518	3,267	1,517	1,722
17	06498	Westbrook	$91,202 ±$22,831	6,856	3,523	3,588
18	06417	Deep River	$90,253 ±$18,732	4,458	2,010	1,988
19	06481	Rockfall	$84,674 ±$80,951	1,763	686	535
20	06457	Middletown	$79,463 ±$5,516	46,720	20,385	—

How we ranked them

Ranked by median household income (ACS 5-year estimates, 2020–2024). The Census Bureau caps published medians at $250,000; ZIP codes at the cap are shown as $250,000+ and ordered by population. ZIP codes need at least 1,000 residents to be ranked; 20 of 24 qualify.

Which of these to mail, and why

Higher-income ZIP codes suit offers with a bigger ticket: remodeling, pools, roofing, financial planning, private schools, premium dining. A median describes the middle household, not every door, so the routes inside each ZIP still vary.

The top five ZIP codes on this list hold 22,786 households, on 43 carrier routes with 23,586 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 06422 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 highest median household income?: 06422 (Durham), at $158,857 (±$7,311), among 20 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median household income (ACS 5-year estimates, 2020–2024). The Census Bureau caps published medians at $250,000; ZIP codes at the cap are shown as $250,000+ and ordered by population.
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.