A Schengen visa is required for persons of certain nationalities who wish to visit the Schengen countries. A Schengen visa can be issued for a maximum of 90 days. U.S citizens do not need a visa to visit Sweden if the visit is 90 days or less. Visa applications for travel to Sweden can be submitted to one of the VFS Global Visa Application Centers in the USA.
Link to: Visa information
Link to: Residence Permit information