Conrad received his first cap for the United States national team on July 7, 2005, in a Gold Cup match against Cuba. Less than one year later, Conrad made the U.S. roster for the 2006 FIFA World Cup. In Germany, Conrad came in as a substitute against Italy in the team's 1–1 draw with the eventual champions, and played all ninety minutes against Ghana. On January 20, 2007, Conrad captained the national team for the second time, where the United States hosted an international friendly with Denmark. The U.S. won that match 3–1. On February 7, 2007, in an international friendly with Mexico, Conrad was named the Man of the Match. He scored his first-ever goal for the U.S. in the fifty-second minute of that match. On June 25, 2009, after not having played with the national team in previous qualifying, Conrad was named to the U.S. squad for the upcoming CONCACAF Gold Cup.