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/LARGEST-AREA

Largest ZIP Codes in South Dakota by Land Area

What this measures. Land area of the Census tabulation area, in square miles. Water is excluded. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 57717 Belle Fourche Butte 1,364.43 sq mi
2 57625 Eagle Butte Dewey 1,307.24 sq mi
3 57626 Faith Perkins 1,305.15 sq mi
4 57720 Buffalo Harding 1,296.16 sq mi
5 57532 Fort Pierre Stanley 1,292.05 sq mi
6 57580 Winner Tripp 1,028.45 sq mi
7 57638 Lemmon Perkins 1,012.37 sq mi
8 57760 Newell Butte 991.75 sq mi
9 57567 Philip Haakon 968.65 sq mi
10 57552 Midland Haakon 951.41 sq mi
11 57735 Edgemont Fall River 904.55 sq mi
12 57633 Isabel Corson 812.64 sq mi
13 57551 Martin Bennett 753.13 sq mi
14 57790 Wall Pennington 735.90 sq mi
15 57644 Meadow Perkins 703.83 sq mi
16 57642 Mc Laughlin Corson 693.27 sq mi
17 57345 Highmore Hyde 646.28 sq mi
18 57623 Dupree Ziebach 639.65 sq mi
19 57579 White River Mellette 629.96 sq mi
20 57787 Union Center Meade 627.24 sq mi
21 57758 Mud Butte Meade 609.19 sq mi
22 57442 Gettysburg Potter 593.40 sq mi
23 57785 Sturgis Meade 570.24 sq mi
24 57501 Pierre Hughes 564.14 sq mi
25 57722 Buffalo Gap Oglala Lakota 544.72 sq mi
26 57649 Prairie City Perkins 536.86 sq mi
27 57437 Eureka McPherson 532.86 sq mi
28 57730 Custer Custer 516.16 sq mi
29 57747 Hot Springs Fall River 508.28 sq mi
30 57772 Porcupine Oglala Lakota 502.56 sq mi
31 57641 Mc Intosh Corson 479.26 sq mi
32 57744 Hermosa Custer 478.58 sq mi
33 57362 Miller Hand 465.72 sq mi
34 57543 Kadoka Jackson 465.67 sq mi
35 57369 Platte Charles Mix 452.40 sq mi
36 57651 Reva Harding 443.79 sq mi
37 57761 New Underwood Meade 441.07 sq mi
38 57564 Onida Sully 439.18 sq mi
39 57382 Wessington Springs Jerauld 438.10 sq mi
40 57438 Faulkton Faulk 435.10 sq mi
41 57559 Murdo Jones 434.46 sq mi
42 57752 Kyle Oglala Lakota 430.44 sq mi
43 57451 Ipswich Edmunds 430.24 sq mi
44 57521 Belvidere Mellette 427.98 sq mi
45 57780 Scenic Pennington 424.61 sq mi
46 57601 Mobridge Dewey 422.39 sq mi
47 57536 Harrold Hughes 411.86 sq mi
48 57748 Howes Meade 399.67 sq mi
49 57656 Timber Lake Dewey 389.44 sq mi
50 57745 Hill City Pennington 385.04 sq mi

Showing the top 50 of 375 ZIP codes in South Dakota that have this figure and meet the threshold above. 57717 ranks 1st at 1,364.43 sq mi, against 385.04 sq mi in 50th place.

Other rankings for South Dakota

Cite this page

zipcodes.pro. “Largest ZIP Codes in South Dakota by Land Area.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/sd/largest-area

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