CIRRUS DESIGN CORP/CIRRUS AIRCRAFT · DULUTH, MNActiveFEDERAL PRISON CAMP · DULUTH, MNActiveHIREL SYSTEMS LLC · DULUTH, MNActiveNORTHWEST AIRLINES INC · DULUTH, MNActiveUS AIR FORCE DULUTH MN ANG · DULUTH, MNActive
Source: U.S. EPA Toxic Release Inventory. Registration does not by itself indicate a health hazard.