Hamm competed as a member of the United States national soccer team in four FIFA Women's World Cup tournaments: the inaugural 1991 in China, 1995 in Sweden, as well as 1999 and 2003 in the United States. She competed at three Summer Olympic Games: 1996 in Atlanta, 2000 in Sydney, and 2004 in Athens. All together, she played in 38 matches and scored 13 goals at seven top international tournaments. With her teammates, Hamm finished third at two World Cup tournaments in 1995 and 2003, second at the 2000 Olympics, and first at the four other international tournaments.