There was an open weight class for Greco-Roman wrestling at the initial Olympics in Athens in 1896. Greco-Roman regained its place at the Olympics with four weight classes at the 1908 London Games. Greco-Roman has been part of the Olympic program since then. There are now seven weight classes.
The United States has won 14 of the 546 Greco-Roman medals that have been awarded in the Olympics since 1908. Here's the list:
Flyweight: Brandon Paulson, silver, 1996 Atlanta.
Bantamweight: Dennis Hall, silver, 1996 Atlanta.
Lightweight: Bronze, James Martinez, 1984 Los Angeles*; Rodney Smith, 1992 Barcelona.
Welterweight: Silver, Matt Lindland, 2000 Sydney.
Heavyweight: Silver, Dennis Koslowski, 1992 Barcelona. Bronze, Koslowski, 1988 Seoul; Adam Wheeler, 2008 Beijing; Bronze, Garrett Lowney, 2000 Sydney.
Super heavyweight: Gold, Jeff Blatnik, 1984 Los Angeles*; Rulon Gardner, 2000 Sydney. Silver, Matt Ghaffari, 1996 Atlanta. Bronze, Gardner, 2004 Athens.
Light heavyweight: Gold, Steve Fraser, 1984 Los Angeles*.
* Los Angeles Games were boycotted by Soviet bloc nations, eliminating many of the best Greco-Roman competitors. ** Light heavyweight class no longer in Olympic program.