Which ZIP code in Middlesex County has the fastest population growth?

06481 (Rockfall), at 35.2%, 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.

Fastest-growing ZIP codes in Middlesex County, CT

These are the 20 ZIP codes in Middlesex County with the fastest population growth, out of 20 with at least 1,000 residents. 06481 (Rockfall, 35.2%), 06442 (Ivoryton, 20.6%) and 06469 (Moodus, 18.2%) 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.

Fastest-growing ZIP codes in Middlesex County

Rank	ZIP	Mailing city	Population change	Residents	Households	Residential mailboxes
1	06481	Rockfall	35.2%	1,763	686	535
2	06442	Ivoryton	20.6%	2,826	1,149	1,062
3	06469	Moodus	18.2%	3,311	1,263	1,301
4	06441	Higganum	6.7%	5,348	2,178	2,080
5	06475	Old Saybrook	4.8%	10,575	4,672	5,197
6	06413	Clinton	3.5%	13,377	5,509	5,974
7	06416	Cromwell	3.0%	14,334	5,763	6,385
8	06480	Portland	1.2%	9,434	3,762	4,042
9	06457	Middletown	0.4%	46,720	20,385	—
10	06424	East Hampton	0.1%	12,751	5,171	5,399
11	06422	Durham	-0.2%	7,208	2,986	2,650
12	06417	Deep River	-0.5%	4,458	2,010	1,988
13	06438	Haddam	-0.7%	2,887	1,036	1,203
14	06498	Westbrook	-0.9%	6,856	3,523	3,588
15	06419	Killingworth	-2.4%	6,240	2,516	2,607
16	06415	Colchester	-3.4%	16,038	6,604	6,956
17	06423	East Haddam	-3.6%	5,182	2,137	2,066
18	06426	Essex	-3.9%	3,267	1,517	1,722
19	06412	Chester	-9.7%	3,825	1,628	1,703
20	06455	Middlefield	-19.4%	2,480	1,153	—

How we ranked them

Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have at least 1,000 residents. ZIP codes need at least 1,000 residents to be ranked; 20 of 24 qualify.

Which of these to mail, and why

Growing ZIP codes add households every year, which means new homes, new routes and customers without a go-to provider yet. Check the route map: new subdivisions can appear as new carrier routes.

The top five ZIP codes on this list hold 9,948 households, on 19 carrier routes with 10,175 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 06481 on the EDDM route map

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Frequently asked questions

Which ZIP code in Middlesex County has the fastest population growth?: 06481 (Rockfall), at 35.2%, among 20 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the change in ACS population estimates between the 2015–2019 and 2020–2024 releases. Both are 5-year averages, and ZIP code areas were redrawn for 2020, so a large change can partly reflect a boundary change. Both periods must have 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.

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.