Williams was signed by the Houston Texans as an undrafted free agent on May 2, 2006 but was released in the final preseason roster reduction.
Green Bay Packers
Williams was signed by the Green Bay Packers on November 29, 2006. In 2007, Tramon earned a roster spot with a solid preseason and went on to play in every contest, as well as both playoff games, with one start, rotating as a nickel and dime back, while posting 11 tackles, 1 interception, and 4 passes defensed. He also had a team-leading 30 kickoff returns for a 22.8 average, with 6 punt returns for a 19.7 average, a touchdown, with 7 special teams tackles. In 2008, he played in every contest for the second straight season, including 9 starts. He was third in the NFC with five interceptions and 52 tackles (45 solo). He was third on the team with 14 passes defensed, 5 special teams tackles, and 2 forced fumbles. In 2009, he played in every contest as well (third straight season), including a career-high 10 starts while Al Harris was injured. He had 4 interceptions, and a career high 55 tackles, with 15 passes defensed and 1 sack.