Blog · October 14, 2026 · South Dakota
Sully County Township Map in South Dakota
Civil and survey townships in Sully County, with the free map, starting near Agar.
Main page: Sully County, SD GIS & Parcel Viewer (official map link, Sully County facts and neighboring maps).
Platbookmapper is an Amazon Associate. If you buy through an Amazon link on this page, we earn a commission. The link is a product, not the county map.
A Sully County township map answers two different questions around Cow Creek: which local township a property sits in, and where it falls on the survey grid. This guide covers the free Sully County, SD options and how to read them.
How to use the Sully County township map
The named townships on a county map are civil townships, and a parcel near Cow Creek belongs to exactly one of them. The survey township cited in deeds near Cow Creek follows the federal survey grid, where a boundary survey township is about 6 miles square; each holds 36 sections, so a farm near Cow Creek may span two.
Opening the Sully County parcel viewer
Sully County publishes its parcels on the District III regional GIS map, which runs on the District III planning district web GIS, free to use for a lot in Onida or a property near Cow Creek. Use the search box for an address in Onida or a parcel number, or simply zoom in and click a property near Cow Creek. If the official address for the Sully County, SD map ever changes, our directory page carries the current link for Onida and the rest of the county.
Seeing township lines on the Sully County map
The District III regional GIS map is the quickest Sully County township map for most people: switch on boundaries and click a parcel near Cow Creek. Copy the section-township-range from the Sully County parcel record to match it with a deed or an older atlas.
Sections, quarters and roads in Sully County
Near Onida, numbering starts with section 1 in the northeast corner, with the count snaking back and forth to 36 in the southeast. Calls like 'NE 1/4 of the SW 1/4' near Onida make sense in reverse: the final quarter listed is the largest piece. Water, old surveys and corrections can leave odd-sized lots along section edges in Sully County.
Township records near Agar
If a county deed near Cow Creek cites a township that no longer appears on the map, the county recorder can typically explain the change. Election maps, school districts and fire districts in Sully County don't always follow township lines near Onida, so check each one separately.
The Sully County economy in brief
Sully County's 2022 business count was 69 establishments, with accommodation and food services, retail trade, and construction the largest groups. Agriculture and forestry support services and accommodation (hotels, motels, RV parks and camps) make up an above-average share of Sully County businesses, a clue to how land around Onida gets used.
Getting oriented in Sully County, SD
Onida is the county seat, and Agar are among the other towns on the county map. Smaller places such as Cow Creek appear on the county map as little clusters of lots. Census Bureau estimates put Sully County at about 1,494 residents in 2023 on about 1,007 square miles of land. Beyond the town lots in Onida, expect big rural parcels across the county. Landforms such as the Mountain Time Zone shape where roads and homesites fall in Sully County.
Tracts that cross the Sully County line
Near the edge of the county, check the next map over: Dewey County, Hughes County, Hyde County, Potter County, and Stanley County all border it. Our South Dakota page links each map neighboring Sully County.
Why the township matters
For a parcel near Cow Creek, township lines decide which local office you deal with, and the county record is the better guide than an address. When you compare tax bills for land near Cow Creek, check whether the parcels sit in the same township; levies can differ across the line.
Sully County, SD: common questions
Does a Sully County mailing town match the township?
Postal service areas around Cow Creek cross township lines, so the two commonly differ.
How do I locate what township a property in Sully County is in?
Click the parcel on the District III regional GIS map; the Sully County record typically names the township.
What is a boundary survey township in Sully County?
They locate land near Cow Creek on the federal survey grid; each survey township holds 36 sections of about 640 acres.
How big is a quarter section near Agar?
Roughly 640 acres per section in Sully County; real sections vary a bit as of survey corrections.
Does the Sully County GIS map show township lines?
Usually; turn on boundary layers in the county viewer and zoom toward Agar.
Open the official Sully County, SD parcel map Sully County in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.