The 2004 GFS Marketplace 400 was the 23rd stock car race of the 2004 NASCAR Nextel Cup Series season and the 35th iteration of the event. The race was held on Sunday, August 22, 2004, before a crowd of 160,000 in Brooklyn, Michigan at Michigan International Speedway, a two-mile (3.2 km) permanent moderate-banked D-shaped speedway. The race took the scheduled 200 laps to complete. At race's end, Greg Biffle of Roush Racing would run away with the race, passing teammate Mark Martin to win his second career NASCAR Nextel Cup Series win and his first of the season. To fill out the podium, Dale Jarrett of Robert Yates Racing would finish third.