The mission of the Maryland State Partnership Program with Harju County, Estonia is to advance the friendship of Maryland and Estonia by providing opportunities for partnerships that enhance cultural exchanges, and establishes economic, educational, medical, political and security links.  Governor Martin O’Malley of Maryland and Governor Verner Lootsman of Harju County, Estonia signed a Sister State Agreement on 18 May 2009 to further this partnership.

As part of this agreement Maryland and Harju County, Estonia each has established a chairperson and a committee of volunteers whose aim is to help and foster mutually beneficial agreements between Maryland and Harju County, Estonia in the areas mentioned above.