THE POLK COUNTY LAND BRIEF
Land in the
Glacial Lake Agassiz Basin setting.
Polk County has 1,971 square miles of land in Minnesota. 4 mapped landscape regions meet across Polk County: Glacial Lake Agassiz Basin, Lake Agassiz Plains, Beach Ridges and Sand Deltas, among others.
The former bed of glacial Lake Agassiz forms an exceptionally flat plain in the Red River valley. Thick lake sediments overlie older glacial deposits across this historic prairie landscape.
Regional context: Lake Agassiz Plain ↗ · Regional mapping across the county footprint
Where the landscape changes
Polk County intersects 4 mapped regional units. The largest mapped shares are:
- Glacial Lake Agassiz Basin49.7%
- Lake Agassiz Plains28.6%
- Beach Ridges and Sand Deltas17.5%
- Alexandria Moraines and Detroit Lakes Outwash Plain4.1%
North Central Hardwood Forests in Polk County
This transition between northern forests and southern farming country includes lakes, wetlands and hardwood woodland. Glacial landforms support a mosaic of open land and wooded areas.
Read the regional source ↗Finding your parcel within Polk County
The atlas lists 73 cities, towns, townships, and Census communities associated with Polk County, including Grove Park-Tilden, Vineland, Hubbard. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Polk County by land and water
The Census records 26.8 square miles of water within Polk County, or 1.3% of its total area. That share is close to Polk County’s 1.3%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Polk County has 61.3 times the land area of nearby Gentilly township (32.2 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Clearwater County, Mahnomen County, Marshall County, Norman County, Pennington County, Red Lake County within Minnesota. A tract near one of these lines should be matched to the county identifier on its own records.

