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/HIGHEST-AVERAGE-INCOME

ZIP Codes With the Highest Average Income in Connecticut

What this measures. Total adjusted gross income divided by the number of tax returns filed. This is income per RETURN, not per person or per household — a return can be a single filer or a married couple. Source: IRS Statistics of Income, ZIP code data, data release 2026-10-12.

# ZIP City County Average AGI per return
1 06870 Old Greenwich Fairfield $816,883
2 06830 Greenwich Fairfield $796,130
3 06831 Greenwich Fairfield $794,111
4 06878 Riverside Fairfield $791,227
5 06820 Darien Fairfield $709,736
6 06840 New Canaan Fairfield $695,618
7 06880 Westport Fairfield $547,218
8 06853 Norwalk Fairfield $538,546
9 06883 Weston Fairfield $401,467
10 06890 Southport Fairfield $399,372
11 06897 Wilton Fairfield $346,773
12 06807 Cos Cob Fairfield $336,960
13 06073 South Glastonbury Hartford $303,899
14 06877 Ridgefield Fairfield $293,359
15 06824 Fairfield Fairfield $293,134
16 06785 South Kent Litchfield $273,362
17 06903 Stamford Fairfield $266,272
18 06783 Roxbury Litchfield $248,986
19 06612 Easton Fairfield $240,980
20 06443 Madison New Haven $237,792
21 06752 Bridgewater Litchfield $236,318
22 06793 Washington Litchfield $233,392
23 06525 New Haven New Haven $232,948
24 06896 Redding Fairfield $226,045
25 06117 West Hartford Hartford $224,962
26 06426 Essex Middlesex $224,668
27 06092 West Simsbury Hartford $222,792
28 06069 Sharon Litchfield $222,789
29 06090 West Granby Hartford $213,139
30 06001 Avon Hartford $212,302
31 06068 Salisbury Litchfield $210,093
32 06107 West Hartford Hartford $206,715
33 06777 New Preston Marble Dale Litchfield $198,617
34 06371 Old Lyme New London $184,866
35 06475 Old Saybrook Middlesex $181,364
36 06794 Washington Depot Litchfield $180,123
37 06039 Lakeville Litchfield $176,191
38 06378 Stonington New London $173,226
39 06470 Newtown Fairfield $172,847
40 06032 Farmington Hartford $171,419
41 06437 Guilford New Haven $168,078
42 06784 Sherman Fairfield $166,910
43 06033 Glastonbury Hartford $164,190
44 06070 Simsbury Hartford $163,319
45 06762 Middlebury New Haven $162,882
46 06060 North Granby Hartford $162,060
47 06757 Kent Litchfield $161,039
48 06901 Stamford Fairfield $160,703
49 06756 Goshen Litchfield $157,351
50 06089 Weatogue Hartford $150,011

Showing the top 50 of 259 ZIP codes in Connecticut that have this figure and meet the threshold above. 06870 ranks 1st at $816,883, against $150,011 in 50th place.

Other rankings for Connecticut

Cite this page

zipcodes.pro. “ZIP Codes With the Highest Average Income in Connecticut.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/ct/highest-average-income

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