[2] Senator Bernie Sanders won the Democratic caucus, held on March 14, which would be his last win in the 2020 primary season.

[3] The Republican caucus, held on March 15 during the party's commonwealth convention, unanimously voted for incumbent President Donald Trump.

The caucus was held at the Saipan World Resort and was organized by the Northern Mariana Islands Democratic Party.

[5] When the Northern Mariana Islands Democratic Party had published its draft delegate selection plan in July 2019, it specified a March 14 date for the 2020 caucus.

[7] Several, if not all major candidates participating in the Democratic primaries had been planned for the caucus ballot in Northern Mariana, but with candidates successively withdrawing nationally, the official field for the caucus had been reduced to Joe Biden and Bernie Sanders by March 5 (ignoring the continued candidacy of representative Tulsi Gabbard, which played no role in national polls), with no write-in votes being allowed and an uncommitted option as the sole alternative.