Parke, 28, was selected by Seattle in the 2009 MLS Expansion Draft however, he opted to sign with the Vancouver Whitecaps, then a member of the United Soccer Leagues First Division, for the 2009 season. In one season for Vancouver, he made 11 appearances.
"We're excited to have Jeff Parke finally join the Sounders," said Sigi Schmid. "He is a very tough, hard-nosed defender who should help our team's defensive efforts."
Parke was drafted out of Drexel University by New York Red Bulls in the 2004 MLS SuperDraft. From 2004 to 2008 Parke was a fixture of the New York Red Bulls backline, playing 132 matches for the club.
In 2006 Parke started a career-high 31 games and was named New York Red Bulls Ironman of the Year, logging in a team-high 2,771 minutes.
Parke will begin training with Seattle on Tuesday, May 18.