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/AZ/HIGHEST-DENSITY

Most Densely Populated ZIP Codes in Arizona

What this measures. People per square mile of land area. Source: Census American Community Survey and Gazetteer, data release 2026-10-12.

# ZIP City County People per sq mi
1 86011 Flagstaff Coconino 31,646
2 85035 Phoenix Maricopa 9,547
3 85033 Phoenix Maricopa 9,413
4 85017 Phoenix Maricopa 8,765
5 85015 Phoenix Maricopa 8,459
6 85031 Phoenix Maricopa 7,679
7 85019 Phoenix Maricopa 7,352
8 85301 Glendale Maricopa 7,322
9 85051 Phoenix Maricopa 7,201
10 85329 Cashion Maricopa 6,994
11 85302 Glendale Maricopa 6,756
12 85037 Phoenix Maricopa 6,678
13 85204 Mesa Maricopa 6,576
14 85719 Tucson Pima 6,508
15 85014 Phoenix Maricopa 6,414
16 85202 Mesa Maricopa 6,214
17 85013 Phoenix Maricopa 6,103
18 85004 Phoenix Maricopa 6,047
19 85003 Phoenix Maricopa 5,847
20 85008 Phoenix Maricopa 5,840
21 85210 Mesa Maricopa 5,839
22 85053 Phoenix Maricopa 5,762
23 85021 Phoenix Maricopa 5,736
24 85032 Phoenix Maricopa 5,730
25 85022 Phoenix Maricopa 5,724
26 85225 Chandler Maricopa 5,696
27 85251 Scottsdale Maricopa 5,645
28 85006 Phoenix Maricopa 5,522
29 85281 Tempe Maricopa 5,468
30 85304 Glendale Maricopa 5,465
31 85201 Mesa Maricopa 5,437
32 85283 Tempe Maricopa 5,377
33 85029 Phoenix Maricopa 5,310
34 85224 Chandler Maricopa 5,088
35 85303 Glendale Maricopa 4,982
36 85711 Tucson Pima 4,939
37 85282 Tempe Maricopa 4,832
38 85345 Peoria Maricopa 4,801
39 85379 Surprise Maricopa 4,751
40 85023 Phoenix Maricopa 4,726
41 85295 Gilbert Maricopa 4,706
42 85710 Tucson Pima 4,692
43 85712 Tucson Pima 4,611
44 85363 Youngtown Maricopa 4,594
45 85716 Tucson Pima 4,581
46 85208 Mesa Maricopa 4,572
47 85296 Gilbert Maricopa 4,549
48 85016 Phoenix Maricopa 4,523
49 85205 Mesa Maricopa 4,454
50 85382 Peoria Maricopa 4,410

Showing the top 50 of 417 ZIP codes in Arizona that have this figure . 86011 ranks 1st at 31,646, against 4,410 in 50th place.

Other rankings for Arizona

Cite this page

zipcodes.pro. “Most Densely Populated ZIP Codes in Arizona.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/az/highest-density

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