Marcinkowski has played for the United States' men's national team at multiple levels, earning 24 caps between the U14 and U18 levels. In 2017, he played for the U20 squad, at the 2017 CONCACAF U-20 Championship and the 2017 FIFA U-20 World Cup. Marcinkowski was named to the final 20-player United States under-23 roster for the 2020 CONCACAF Men's Olympic Qualifying Championship in March 2021.
