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/ME/LARGEST-POPULATION

ZIP Codes With the Largest Population in Maine

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 04401 Bangor Penobscot 44,854
2 04240 Lewiston Androscoggin 38,324
3 04103 Portland Cumberland 32,024
4 04901 Waterville Kennebec 27,870
5 04106 South Portland Cumberland 27,019
6 04330 Augusta Kennebec 26,690
7 04005 Biddeford York 24,772
8 04210 Auburn Androscoggin 24,602
9 04074 Scarborough Cumberland 23,076
10 04011 Brunswick Cumberland 22,336
11 04072 Saco York 20,819
12 04092 Westbrook Cumberland 20,775
13 04062 Windham Cumberland 19,188
14 04101 Portland Cumberland 18,431
15 04038 Gorham Cumberland 18,300
16 04073 Sanford York 17,414
17 04102 Portland Cumberland 17,267
18 04605 Ellsworth Hancock 14,529
19 04105 Falmouth Cumberland 12,755
20 04345 Gardiner Kennebec 12,579
21 04043 Kennebunk York 11,820
22 04090 Wells York 11,713
23 04530 Bath Sagadahoc 11,275
24 03909 York York 10,943
25 04938 Farmington Franklin 10,542
26 04730 Houlton Aroostook 10,106
27 04976 Skowhegan Somerset 10,072
28 04086 Topsham Sagadahoc 9,706
29 04107 Cape Elizabeth Cumberland 9,656
30 04412 Brewer Penobscot 9,652
31 04444 Hampden Penobscot 9,371
32 04468 Old Town Penobscot 9,291
33 04915 Belfast Waldo 9,107
34 04096 Yarmouth Cumberland 9,053
35 04736 Caribou Aroostook 9,025
36 04032 Freeport Cumberland 8,802
37 04769 Presque Isle Aroostook 8,736
38 04064 Old Orchard Beach York 8,632
39 04093 Buxton York 8,512
40 03904 Kittery York 8,389
41 04473 Orono Penobscot 8,371
42 03901 Berwick York 8,175
43 04039 Gray Cumberland 8,102
44 04046 Kennebunkport York 8,102
45 04084 Standish Cumberland 7,900
46 04002 Alfred York 7,737
47 04963 Oakland Kennebec 7,524
48 03908 South Berwick York 7,431
49 03903 Eliot York 7,146
50 04280 Sabattus Androscoggin 7,040

Showing the top 50 of 426 ZIP codes in Maine that have this figure . 04401 ranks 1st at 44,854, against 7,040 in 50th place.

Other rankings for Maine

Cite this page

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

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