The following table indicates the party of elected officials in the United States insular area of the Northern Mariana Islands:
The table also indicates the historical party composition in the:
The parties are as follows: Covenant (C), Democratic (D), Independent (I), Republican/Territorial (R)/(T), Reform (Ref), Vacant (V), and a tie or coalition within a group of elected officials.
| Year | Executive offices | Commonwealth Legislature | U.S. House | |||
|---|---|---|---|---|---|---|
| Governor | Lieutenant Governor | Attorney General | Senate | House | ||
| 1978 | Carlos Camacho (D) | Francisco Ada (D) | appointed | 5T, [a] 4D | 8T, [a] 6D | Edward Pangelinan (D) |
| 1979 | ||||||
| 1980 | T [a] majority | D majority | ||||
| 1981 | ||||||
| 1982 | Pedro Tenorio (R) | Pedro Agulto Tenorio (R) | R majority | R majority | ||
| 1983 | Edward Pangelinan (R) | |||||
| 1984 | R majority | D majority | Froilan Tenorio (D) | |||
| 1985 | ||||||
| 1986 | [ ? ] | R majority | ||||
| 1987 | ||||||
| 1988 | R majority | D majority | ||||
| 1989 | ||||||
| 1990 | Lorenzo I. De Leon Guerrero (R) | Benjamin Manglona (R) | D majority | R majority | Juan Babauta (R) | |
| 1991 | ||||||
| 1992 | R majority | 10R, 6D, 2I [1] | ||||
| 1993 | ||||||
| 1994 | Froilan Tenorio (D) | Jesus Borja (D) | R majority | R majority | ||
| 1995 | ||||||
| 1996 | R majority | R majority | ||||
| 1997 | ||||||
| 1998 | Pedro Tenorio (R) | Jesus Sablan (R) | 8R, 1D | 13R, 5D | ||
| 1999 | ||||||
| 2000 | 6R, 2D, 1Ref | 11R, 6D, 1I | ||||
| 2001 | ||||||
| 2002 | Juan Babauta (R) | Diego Benavente (R) | 5R, 3D, 1C [b] | 16R, 1D, 1C | Pedro Agulto Tenorio (R) | |
| 2003 | ||||||
| 2004 | 3C, 2D, 2R, 2I | 9C, 7R, 1D, 1I | ||||
| 2005 | ||||||
| 2006 | Benigno Fitial (C) | Timothy Villagomez (C) [c] | 3C, 3R, 2D, 1I [d] | 7C, 7R, 2D, 2I | ||
| 2007 | ||||||
| 2008 | 12R, 4C, 3I, 1D | |||||
| 2009 | Eloy Inos (C) [e] | Gregorio Sablan (I) | ||||
| 2010 | 5R, 4I | 9R, 7C, 4I | ||||
| 2011 | Benigno Fitial (R) [f] [g] | |||||
| 2012 | ||||||
| 2013 | Eloy Inos (C) [h] | Jude Hofschneider (R) [e] | 5R, 4I | 12I, 4R, 4C | ||
| 2014 | Eloy Inos (R) [i] [j] | 5R, 3I, 1V [k] | ||||
| 2015 | Ralph Torres (R) | Edward Manibusan (NP) [l] | 7R, 2I | 13I, 7R | ||
| 2016 | Ralph Torres (R) [m] | Victor Hocog (R) | 6R, 3I | |||
| 2017 | 7R, 2I | 15R, 5I | ||||
| 2018 | ||||||
| 2019 | Arnold Palacios (R) | 6R, 3I | 13R, 7I | |||
| 2020 | ||||||
| 2021 | 5R, 3I, 1D | 9R, 8D, 2ID, 1IR [n] | ||||
| 2022 | Arnold Palacios (I) [o] | |||||
| 2023 | Arnold Palacios (I) | David M. Apatang (I) | 4R, 3I, 2D [p] | 13I, 4D, 3R [q] | Gregorio Sablan (D) [l] | |
| 2024 | ||||||
| 2025 | Arnold Palacios (R) [o] [j] | 16I, 2D, 2R [q] | Kimberlyn King-Hinds (R) [l] | |||
| David M. Apatang (I) [m] | Dennis C. Mendiola (R) [h] | |||||