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/OLDEST

ZIP Codes With the Oldest Population in California

What this measures. Median age of residents, ACS 5-year estimate. Source: Census American Community Survey, data release 2026-10-12.

# ZIP City County Median age
1 96040 Hat Creek Shasta 78.3
2 96111 Floriston Nevada 76.6
3 95974 Richvale Butte 76.1
4 95934 Crescent Mills Plumas 75.5
5 95375 Strawberry Tuolumne 75.3
6 94573 Rutherford Napa 75.2
7 92637 Laguna Woods Orange 74.9
8 95429 Dos Rios Mendocino 74.7
9 95698 Zamora Yolo 73.0
10 91046 Verdugo City Los Angeles 72.5
11 95569 Redcrest Humboldt 72.4
12 96125 Sierra City Sierra 72.4
13 90822 Long Beach Los Angeles 72.3
14 96115 Lake City Modoc 71.9
15 94956 Point Reyes Station Marin 71.5
16 94970 Stinson Beach Marin 71.1
17 96015 Canby Modoc 70.9
18 95497 The Sea Ranch Sonoma 70.3
19 95699 Drytown Amador 70.2
20 96123 Ravendale Lassen 70.2
21 96110 Eagleville Modoc 69.8
22 93226 Glennville Kern 69.2
23 93921 Carmel By The Sea Monterey 69.2
24 94595 Walnut Creek Contra Costa 69.2
25 93962 Spreckels Monterey 68.8
26 90073 Los Angeles Los Angeles 68.7
27 95984 Twain Plumas 68.6
28 93664 Shaver Lake Fresno 68.5
29 95230 Farmington Stanislaus 68.4
30 96132 Termo Lassen 68.3
31 96017 Castella Shasta 68.2
32 95717 Gold Run Placer 68.0
33 92210 Indian Wells Riverside 67.9
34 96031 Forks Of Salmon Siskiyou 67.9
35 94569 Port Costa Contra Costa 67.3
36 96103 Blairsden Graeagle Plumas 67.1
37 96016 Cassel Shasta 66.8
38 96136 Wendel Lassen 66.7
39 95460 Mendocino Mendocino 66.6
40 93522 Darwin Inyo 66.3
41 93529 June Lake Mono 66.3
42 96063 Mineral Tehama 66.3
43 95257 Wilseyville Calaveras 66.2
44 95914 Bangor Butte 66.2
45 92270 Rancho Mirage Riverside 66.1
46 95937 Dunnigan Yolo 66.0
47 93603 Badger Tulare 65.7
48 94599 Yountville Napa 65.6
49 95345 Midpines Mariposa 65.6
50 95922 Camptonville Yuba 65.6

Showing the top 50 of 1,741 ZIP codes in California that have this figure . 96040 ranks 1st at 78.3, against 65.6 in 50th place.

Other rankings for California

Cite this page

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

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