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/SD/OLDEST

ZIP Codes With the Oldest Population in South Dakota

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 57426 Barnard Brown 82.2
2 57792 White Owl Meade 73.8
3 57344 Harrison Douglas 72.8
4 57323 Carthage Miner 70.1
5 57117 Sioux Falls Minnehaha 69.8
6 57584 Witten Tripp 68.5
7 57446 Hecla Brown 66.1
8 57738 Fairburn Custer 65.5
9 57630 Glencross Dewey 64.2
10 57759 Nemo Lawrence 63.8
11 57224 Claire City Roberts 63.5
12 57437 Eureka McPherson 63.3
13 57239 Grenville Day 63.2
14 57534 Hamill Tripp 63.2
15 57457 Long Lake McPherson 63.1
16 57716 Batesland Oglala Lakota 62.9
17 57247 Lake City Marshall 62.3
18 57529 Dallas Tripp 62.3
19 57732 Deadwood Lawrence 61.5
20 57631 Glenham Walworth 60.7
21 57741 Fort Meade Meade 60.5
22 57051 Oldham Kingsbury 60.1
23 57747 Hot Springs Fall River 60.1
24 57217 Bradley Clark 59.5
25 57452 Java Walworth 59.0
26 57766 Oral Fall River 58.8
27 57238 Goodwin Deuel 58.5
28 57448 Hosmer McPherson 58.4
29 57725 Caputa Pennington 58.3
30 57730 Custer Custer 57.9
31 57780 Scenic Pennington 57.8
32 57342 Geddes Charles Mix 57.5
33 57722 Buffalo Gap Oglala Lakota 57.5
34 57455 Lebanon Potter 57.4
35 57574 Tuthill Bennett 57.2
36 57075 Wentworth Lake 56.8
37 57237 Gary Deuel 56.7
38 57436 Doland Spink 56.7
39 57571 Saint Charles Gregory 56.5
40 57040 Lesterville Yankton 56.4
41 57279 Wilmot Roberts 56.3
42 57027 Fairview Lincoln 56.1
43 57791 Wasta Meade 56.0
44 57345 Highmore Hyde 55.7
45 57367 Pickstown Charles Mix 55.6
46 57382 Wessington Springs Jerauld 55.6
47 57552 Midland Haakon 55.3
48 57568 Presho Lyman 55.3
49 57243 Henry Codington 55.1
50 57640 Lodgepole Perkins 55.1

Showing the top 50 of 369 ZIP codes in South Dakota that have this figure . 57426 ranks 1st at 82.2, against 55.1 in 50th place.

Other rankings for South Dakota

Cite this page

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

Underlying data is public domain or openly licensed — sources, vintages and licences.