County GIS · State lines · October 20, 2026
Nebraska–South Dakota Border Counties and Their Parcel Maps
All 21 counties on the Nebraska–South Dakota line, with seats, populations and each official parcel map, plus what changes at the line.
Looking for the counties on the Nebraska–South Dakota border and their parcel maps? According to the Census Bureau's county adjacency file, 10 Nebraska counties touch 11 South Dakota counties along the line. Each one keeps its own property records and its own parcel viewer, so land near the line often means checking two counties in two states.
Below you will find every county on both sides of the line, who borders whom, and what changes when you cross from one records office to the other.
Nebraska–South Dakota border at a glance
- Counties on the line: 21 (10 in Nebraska, 11 in South Dakota)
- With a verified public parcel viewer in our directory: 21 of 21
- Residents, 2023 estimates: about 65,556 on the Nebraska side and 115,406 on the South Dakota side
- Most populous on each side: Dakota County, NE (21,268) and Yankton County, SD (23,517)
- Largest by land area: Cherry County, NE (5,960 sq mi) and Oglala Lakota County, SD (2,094 sq mi)
Nebraska counties on the line
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Boyd County | Butte | 540 | 1,725 | gWorks |
| Cedar County | Hartington | 740 | 8,262 | gWorks |
| Cherry County | Valentine | 5,960 | 5,492 | ArcGIS Experience Builder |
| Dakota County | Dakota City | 264 | 21,268 | gWorks |
| Dawes County | Chadron | 1,396 | 8,133 | gWorks |
| Dixon County | Ponca | 476 | 5,491 | Beacon (Schneider Geospatial) |
| Keya Paha County | Springview | 773 | 805 | gWorks |
| Knox County | Center | 1,108 | 8,298 | gWorks |
| Sheridan County | Rushville | 2,441 | 4,928 | gWorks |
| Sioux County | Harrison | 2,067 | 1,154 | gWorks |
South Dakota counties on the line
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Bennett County | Martin | 1,185 | 3,305 | planning-district WebGIS |
| Bon Homme County | Tyndall | 564 | 7,065 | planning-district WebGIS |
| Charles Mix County | Lake Andes | 1,097 | 9,240 | planning-district WebGIS |
| Clay County | Vermillion | 412 | 15,431 | Beacon (Schneider Geospatial) |
| Fall River County | Hot Springs | 1,740 | 7,393 | CAMAvision Maps |
| Gregory County | Burke | 1,015 | 4,018 | planning-district WebGIS |
| Oglala Lakota County | Hot Springs | 2,094 | 13,434 | CAMAvision Maps |
| Todd County | Winner | 1,389 | 9,199 | planning-district WebGIS |
| Tripp County | Winner | 1,612 | 5,621 | planning-district WebGIS |
| Union County | Elk Point | 461 | 17,183 | Beacon (Schneider Geospatial) |
| Yankton County | Yankton | 521 | 23,517 | Beacon (Schneider Geospatial) |
Which counties face each other
Here is who borders whom across the line, based on the Census Bureau adjacency file:
- Boyd County, NE borders Charles Mix County, SD, Gregory County, SD
- Cedar County, NE borders Clay County, SD, Yankton County, SD
- Cherry County, NE borders Bennett County, SD, Oglala Lakota County, SD, Todd County, SD, Tripp County, SD
- Dakota County, NE borders Union County, SD
- Dawes County, NE borders Fall River County, SD, Oglala Lakota County, SD
- Dixon County, NE borders Clay County, SD, Union County, SD
- Keya Paha County, NE borders Gregory County, SD, Todd County, SD, Tripp County, SD
- Knox County, NE borders Bon Homme County, SD, Charles Mix County, SD, Yankton County, SD
- Sheridan County, NE borders Oglala Lakota County, SD
- Sioux County, NE borders Fall River County, SD
What changes when you cross the line
- Different viewers. On the Nebraska side the official maps run on: gWorks (8); ArcGIS Experience Builder (1); Beacon (Schneider Geospatial) (1). On the South Dakota side: planning-district WebGIS (6); Beacon (Schneider Geospatial) (3); CAMAvision Maps (2). Search boxes, parcel ID formats and the details shown in pop-ups will differ.
- Different records offices. Deeds, plats and tax bills are kept by the county where the parcel sits.
- Different rules. Zoning, septic permits and property tax are set locally and by each state, so check with the county on the side where you plan to build or buy.
Researching a tract that crosses the line
- Find the parcel in both counties' viewers. Each side will show only its own piece, with its own parcel number.
- Pull the recorded deed from each county's register or recorder, since each county records only the land inside its own boundary.
- Expect two tax bills, one from each county, and check each state's rules for homestead or farm exemptions.
- For a sale, a fence or a building permit, hire a licensed surveyor familiar with the line; tax-map lines are drawings, not surveys.
A quick way to check which side a spot is on
Open the Platbookmapper Land Map, search the nearest county, and tap the spot. The land report shows which county it falls in, along with flood zone, elevation, soil and wetlands, and links to that county's parcel map.
Related guides
More: Nebraska counties · South Dakota counties
Sources
- U.S. Census Bureau county adjacency file, used for which counties share the line.
- U.S. Census Bureau Gazetteer files, 2020 county land area.
- U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2023 (July 1, 2023 estimates)
- Platbookmapper county GIS directory (live data file behind our county pages, pulled October 20, 2026) for each county's official parcel viewer.
- County seats: Wikidata (county seat property), cross-checked against Census place names.