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/CA/LARGEST-POPULATION

ZIP Codes With the Largest Population in California

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 92336 Fontana San Bernardino 105,517
2 94565 Pittsburg Contra Costa 100,488
3 90011 Los Angeles Los Angeles 100,113
4 90650 Norwalk Los Angeles 99,900
5 91331 Pacoima Los Angeles 97,608
6 92335 Fontana San Bernardino 97,511
7 90044 Los Angeles Los Angeles 94,830
8 90250 Hawthorne Los Angeles 93,826
9 91342 Sylmar Los Angeles 93,301
10 90201 Bell Gardens Los Angeles 92,763
11 90805 Long Beach Los Angeles 92,402
12 90280 South Gate Los Angeles 91,365
13 92683 Westminster Orange 89,833
14 92345 Hesperia San Bernardino 88,706
15 92503 Riverside Riverside 88,395
16 93722 Fresno Fresno 86,110
17 93307 Bakersfield Kern 85,945
18 91911 Chula Vista San Diego 85,542
19 92376 Rialto San Bernardino 84,394
20 93727 Fresno Fresno 84,107
21 95747 Roseville Placer 83,902
22 95823 Sacramento Sacramento 83,607
23 92804 Anaheim Orange 83,537
24 95076 Watsonville Santa Cruz 82,806
25 92704 Santa Ana Orange 82,120
26 92509 Riverside Riverside 81,182
27 93550 Palmdale Los Angeles 80,645
28 93257 Porterville Tulare 80,467
29 92154 San Diego San Diego 80,445
30 92563 Murrieta Riverside 80,379
31 92592 Temecula Riverside 80,035
32 93274 Tulare Tulare 80,026
33 95630 Folsom Sacramento 79,484
34 93535 Lancaster Los Angeles 79,409
35 94112 San Francisco San Francisco 79,277
36 95035 Milpitas Santa Clara 78,810
37 94533 Fairfield Solano 78,805
38 91710 Chino San Bernardino 78,754
39 93033 Oxnard Ventura 78,737
40 91709 Chino Hills San Bernardino 78,006
41 91910 Chula Vista San Diego 77,123
42 94544 Hayward Alameda 76,947
43 91744 La Puente Los Angeles 76,942
44 90706 Bellflower Los Angeles 76,819
45 92126 San Diego San Diego 76,059
46 92880 Corona Riverside 75,043
47 92805 Anaheim Orange 74,661
48 92553 Moreno Valley Riverside 74,640
49 91335 Reseda Los Angeles 74,526
50 93306 Bakersfield Kern 74,116

Showing the top 50 of 1,802 ZIP codes in California that have this figure . 92336 ranks 1st at 105,517, against 74,116 in 50th place.

Other rankings for California

Cite this page

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

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