Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — RANKINGS/CT/LARGEST-POPULATION

ZIP Codes With the Largest Population in Connecticut

What this measures. Population of the Census tabulation area, ACS 5-year estimate. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Population
1 06902 Stamford Fairfield 73,392
2 06010 Bristol Hartford 61,684
3 06810 Danbury Fairfield 55,833
4 06516 West Haven New Haven 55,351
5 06511 New Haven New Haven 54,730
6 06606 Bridgeport Fairfield 49,308
7 06457 Middletown Middlesex 46,720
8 06492 Wallingford New Haven 44,498
9 06484 Shelton Fairfield 41,889
10 06082 Enfield Hartford 41,090
11 06513 New Haven New Haven 38,888
12 06460 Milford New Haven 37,649
13 06611 Trumbull Fairfield 37,281
14 06360 Norwich New London 37,216
15 06053 New Britain Hartford 36,774
16 06824 Fairfield Fairfield 36,716
17 06106 Hartford Hartford 36,322
18 06040 Manchester Hartford 35,813
19 06450 Meriden New Haven 35,694
20 06614 Stratford Fairfield 35,654
21 06790 Torrington Litchfield 35,566
22 06489 Southington Hartford 32,706
23 06854 Norwalk Fairfield 32,118
24 06770 Naugatuck New Haven 31,823
25 06604 Bridgeport Fairfield 31,771
26 06704 Waterbury New Haven 31,713
27 06811 Danbury Fairfield 31,228
28 06111 Newington Hartford 30,896
29 06066 Vernon Rockville Tolland 30,577
30 06033 Glastonbury Hartford 29,921
31 06340 Groton New London 29,863
32 06095 Windsor Hartford 29,670
33 06708 Waterbury New Haven 29,594
34 06051 New Britain Hartford 29,548
35 06410 Cheshire New Haven 28,904
36 06512 New Haven New Haven 28,830
37 06405 Branford New Haven 28,217
38 06851 Norwalk Fairfield 27,865
39 06320 New London New London 27,703
40 06880 Westport Fairfield 27,583
41 06118 East Hartford Hartford 27,419
42 06109 Wethersfield Hartford 27,250
43 06776 New Milford Litchfield 27,010
44 06074 South Windsor Hartford 26,907
45 06514 Hamden New Haven 26,803
46 06114 Hartford Hartford 26,458
47 06605 Bridgeport Fairfield 25,929
48 06705 Waterbury New Haven 25,266
49 06877 Ridgefield Fairfield 25,110
50 06830 Greenwich Fairfield 24,880

Showing the top 50 of 288 ZIP codes in Connecticut that have this figure . 06902 ranks 1st at 73,392, against 24,880 in 50th place.

Other rankings for Connecticut

Cite this page

zipcodes.pro. “ZIP Codes With the Largest Population in Connecticut.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/ct/largest-population

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