Minnesota: 87 counties covered
Of 87 rated Minnesota counties, 68 are in EPA's highest radon-potential zone (Zone 1) — but every county page links to testing guidance regardless of zone, because a county rating is a county-wide average, not a reading for any one house.
- Hennepin County
- Ramsey County
- Dakota County
- Anoka County
- Washington County
- St. Louis County
- Olmsted County
- Stearns County
- Scott County
- Wright County
- Carver County
- Sherburne County
- Blue Earth County
- Rice County
- Crow Wing County
- Clay County
- Otter Tail County
- Chisago County
- Winona County
- Goodhue County
- Beltrami County
- Itasca County
- Kandiyohi County
- Isanti County
- Benton County
- Mower County
- Douglas County
- Steele County
- McLeod County
- Carlton County
- Becker County
- Morrison County
- Nicollet County
- Cass County
- Polk County
- Pine County
- Freeborn County
- Le Sueur County
- Mille Lacs County
- Todd County
- Brown County
- Lyon County
- Meeker County
- Hubbard County
- Nobles County
- Wabasha County
- Fillmore County
- Dodge County
- Martin County
- Waseca County
- Houston County
- Kanabec County
- Aitkin County
- Roseau County
- Redwood County
- Sibley County
- Renville County
- Wadena County
- Faribault County
- Pennington County
- Chippewa County
- Koochiching County
- Pope County
- Cottonwood County
- Watonwan County
- Lake County
- Jackson County
- Stevens County
- Swift County
- Rock County
- Yellow Medicine County
- Pipestone County
- Marshall County
- Clearwater County
- Murray County
- Lac qui Parle County
- Norman County
- Wilkin County
- Grant County
- Cook County
- Lincoln County
- Mahnomen County
- Big Stone County
- Kittson County
- Red Lake County
- Lake of the Woods County
- Traverse County