Following his successful 2012 MLS season, Morrow was called up to the national team for the first time. He started in a draw against Canada in a January 2013 friendly. He was an unused sub in two 2014 World Cup qualifiers against Costa Rica and Mexico in March 2013. Morrow would return to the national team in 2017, being named to the 2017 CONCACAF Gold Cup roster. He would earn his second cap with the squad, starting and playing the full 90 minutes, in the U.S.'s second match of the tournament versus Martinique, which ended in a 3–2 win.