States/Provinces using SIS in North America:

Alberta, Canada

Colorado

Georgia
Press release 

Louisiana
Press release
State link

Maryland

Missouri

New Hampshire

North Carolina

Oklahoma

Ontario 

Oregon

Pennsylvania

Rhode Island

Utah
Press release 
State website

Virginia

Washington
Press release
State website

West Virginia

International users

Australia

Belgium

Canada

Catalonia

Croatia

Czech Republic

Greece
Iceland

Ireland

Israel
Italy
Japan

Korea
Netherlands

Portugal
Spain
Taiwan