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/YOUNGEST

ZIP Codes With the Youngest Population in California

What this measures. Median age of residents, lowest first. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Median age
1 96116 Likely Modoc 4.1
2 95978 Stirling City Butte 6.6
3 95443 Glenhaven Lake 6.8
4 96010 Big Bar Trinity 9.5
5 95248 Rail Road Flat Calaveras 11.8
6 96117 Litchfield Lassen 14.1
7 95697 Yolo Yolo 15.5
8 91963 Potrero San Diego 16.6
9 95930 Clipper Mills Butte 17.6
10 93627 Helm Fresno 17.7
11 95387 Westley Stanislaus 19.0
12 93407 San Luis Obispo San Luis Obispo 19.1
13 93410 San Luis Obispo San Luis Obispo 19.2
14 90089 Los Angeles Los Angeles 19.5
15 92093 La Jolla San Diego 19.5
16 95064 Santa Cruz Santa Cruz 19.6
17 95053 Santa Clara Santa Clara 19.7
18 93740 Fresno Fresno 19.8
19 90263 Malibu Los Angeles 19.9
20 94720 Berkeley Alameda 19.9
21 94613 Oakland Alameda 20.0
22 95211 Stockton San Joaquin 20.0
23 94575 Moraga Contra Costa 20.1
24 90639 La Mirada Los Angeles 20.3
25 91330 Northridge Los Angeles 20.3
26 93645 O Neals Madera 20.3
27 96078 Proberta Tehama 20.3
28 92140 San Diego San Diego 20.5
29 92092 La Jolla San Diego 20.7
30 92617 Irvine Orange 20.7
31 93106 Santa Barbara Santa Barbara 20.7
32 92278 Twentynine Palms San Bernardino 21.1
33 92055 Camp Pendleton San Diego 21.2
34 92135 San Diego San Diego 21.2
35 92145 San Diego San Diego 21.6
36 93524 Edwards Kern 21.6
37 91125 Pasadena Los Angeles 21.7
38 95639 Hood Sacramento 21.7
39 93042 Point Mugu Nawc Ventura 21.8
40 94305 Stanford Santa Clara 21.9
41 94704 Berkeley Alameda 21.9
42 92350 Loma Linda San Bernardino 22.0
43 92134 San Diego San Diego 22.2
44 92147 San Diego San Diego 22.2
45 93043 Port Hueneme Cbc Base Ventura 22.2
46 93944 Monterey Monterey 22.3
47 93405 San Luis Obispo San Luis Obispo 22.6
48 95253 Victor San Joaquin 22.6
49 90024 Los Angeles Los Angeles 22.7
50 93246 Lemoore Kings 22.7

Showing the top 50 of 1,741 ZIP codes in California that have this figure . 96116 ranks 1st at 4.1, against 22.7 in 50th place.

Other rankings for California

Cite this page

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

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