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/NH/MOST-TAX-RETURNS

ZIP Codes With the Most Tax Returns Filed in New Hampshire

What this measures. Number of individual income tax returns filed. A rough proxy for how many households a ZIP code contains, available where census figures are not. Source: IRS Statistics of Income, ZIP code data, data release 2026-10-12.

# ZIP City County Returns filed
1 03103 Manchester Hillsborough 18,850
2 03038 Derry Rockingham 17,940
3 03820 Dover Strafford 17,640
4 03104 Manchester Hillsborough 17,440
5 03079 Salem Rockingham 16,700
6 03102 Manchester Hillsborough 16,660
7 03301 Concord Merrimack 16,430
8 03062 Nashua Hillsborough 15,550
9 03054 Merrimack Hillsborough 15,300
10 03060 Nashua Hillsborough 15,240
11 03051 Hudson Hillsborough 14,000
12 03053 Londonderry Rockingham 13,940
13 03801 Portsmouth Rockingham 13,120
14 03833 Exeter Rockingham 12,190
15 03431 Keene Cheshire 12,010
16 03867 Rochester Strafford 11,430
17 03110 Bedford Hillsborough 11,410
18 03842 Hampton Rockingham 9,380
19 03063 Nashua Hillsborough 9,020
20 03055 Milford Hillsborough 8,660
21 03246 Laconia Belknap 8,620
22 03303 Concord Merrimack 8,280
23 03064 Nashua Hillsborough 8,080
24 03087 Windham Rockingham 7,830
25 03106 Hooksett Merrimack 7,810
26 03076 Pelham Hillsborough 7,730
27 03045 Goffstown Hillsborough 7,160
28 03878 Somersworth Strafford 6,670
29 03743 Claremont Sullivan 6,600
30 03275 Suncook Merrimack 6,450
31 03109 Manchester Hillsborough 6,120
32 03031 Amherst Hillsborough 6,030
33 03077 Raymond Rockingham 5,830
34 03766 Lebanon Grafton 5,590
35 03857 Newmarket Rockingham 5,230
36 03874 Seabrook Rockingham 5,110
37 03825 Barrington Strafford 5,070
38 03281 Weare Hillsborough 4,680
39 03052 Litchfield Hillsborough 4,610
40 03276 Tilton Merrimack 4,460
41 03049 Hollis Hillsborough 4,400
42 03865 Plaistow Rockingham 4,360
43 03235 Franklin Merrimack 4,330
44 03885 Stratham Rockingham 4,220
45 03244 Hillsborough Hillsborough 4,210
46 03811 Atkinson Rockingham 4,190
47 03304 Bow Merrimack 4,080
48 03042 Epping Rockingham 3,960
49 03773 Newport Sullivan 3,960
50 03249 Gilford Belknap 3,950

Showing the top 50 of 229 ZIP codes in New Hampshire that have this figure . 03103 ranks 1st at 18,850, against 3,950 in 50th place.

Other rankings for New Hampshire

Cite this page

zipcodes.pro. “ZIP Codes With the Most Tax Returns Filed in New Hampshire.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/nh/most-tax-returns

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