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/HIGHEST-DENSITY

Most Densely Populated ZIP Codes in South Dakota

What this measures. People per square mile of land area. Source: Census American Community Survey and Gazetteer, data release 2026-10-12.

# ZIP City County People per sq mi
1 57007 Brookings Brookings 7,160
2 57197 Sioux Falls Minnehaha 4,619
3 57103 Sioux Falls Minnehaha 3,759
4 57105 Sioux Falls Minnehaha 3,097
5 57799 Spearfish Lawrence 3,021
6 57106 Sioux Falls Minnehaha 1,715
7 57108 Sioux Falls Lincoln 1,117
8 57110 Sioux Falls Minnehaha 1,116
9 57104 Sioux Falls Minnehaha 887
10 57701 Rapid City Pennington 877
11 57741 Fort Meade Meade 860
12 57245 Kranzburg Codington 609
13 57061 Sinai Brookings 584
14 57117 Sioux Falls Minnehaha 564
15 57049 North Sioux City Union 562
16 57706 Ellsworth Afb Meade 454
17 57064 Tea Lincoln 314
18 57718 Black Hawk Meade 299
19 57107 Sioux Falls Minnehaha 270
20 57005 Brandon Minnehaha 251
21 57032 Harrisburg Lincoln 214
22 57078 Yankton Yankton 183
23 57006 Brookings Brookings 159
24 57639 Little Eagle Corson 147
25 57703 Rapid City Pennington 139
26 57702 Rapid City Pennington 125
27 57401 Aberdeen Brown 115
28 57361 Marty Charles Mix 112
29 57621 Bullhead Corson 96
30 57020 Crooks Minnehaha 91
31 57201 Watertown Codington 84
32 57055 Renner Minnehaha 83
33 57783 Spearfish Lawrence 81
34 57301 Mitchell Davison 80
35 57069 Vermillion Clay 77
36 57354 Kaylor Hutchinson 73
37 57719 Box Elder Meade 73
38 57367 Pickstown Charles Mix 61
39 57350 Huron Beadle 55
40 57346 Stephan Hyde 47
41 57033 Hartford Minnehaha 46
42 57003 Baltic Minnehaha 45
43 57570 Rosebud Todd 44
44 57041 Lyons Minnehaha 42
45 57042 Madison Lake 40
46 57039 Lennox Lincoln 39
47 57022 Dell Rapids Minnehaha 38
48 57038 Jefferson Union 36
49 57068 Valley Springs Minnehaha 35
50 57773 Pringle Custer 34

Showing the top 50 of 375 ZIP codes in South Dakota that have this figure . 57007 ranks 1st at 7,160, against 34 in 50th place.

Other rankings for South Dakota

Cite this page

zipcodes.pro. “Most Densely Populated ZIP Codes in South Dakota.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/sd/highest-density

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