In October of 1999, the search for Roselle's Sister City began and a Sister City Commission was formed. The Roselle Village Board approved a plan to form a Sister City Relaionship with Bochnia, Poland in July, 2000. Upon an invitation from Mayor Cholewa, a Roselle delegation visited Bochnia, Poland in April, 2001. Mayor Cholewa and Town Council President, Jan Olszewski came to Roselle in August 2003 and an Signing Ceremony took place on August 3, 2003. Mayor Gayle Smolinski and Sister City delegates went to Bochnia, Poland in June 2004 for an additional Offical Signing Ceremony.
The mission of the Roselle Sister City Commission is "Promoting World Peace and Cultural Understanding".