The 2018 Maine House of Representatives elections took place as part of the biennial United States elections. Maine voters elected state representatives in all 151 of the state house's districts, as well as non-voting members from the Passamaquoddy Tribe and the Houlton Band of Maliseet Indians. State representatives serve two-year terms in the Maine State House.

A primary election on June 12, 2018, determined which candidates appeared on the November 6 general election ballot. Primary election results can be obtained from the Maine Secretary of State's website.

Following the 2016 state house elections, Democrats maintained effective control of the House with 77 members and two coalition Green representatives. Republicans held 72 seats following the 2016 elections. Following several vacancies and replacements between 2016 and 2018, on election day 2018, the Democrats had increased their majority to 74 Democrats, one Green, and six Independent representatives, while the Republicans had decreased from 72 to 70 seats.

The Maine Secretary of State provides both a detailed description of each house seat as well as maps for each district, including this statewide House map showing all 151 House districts.

The Democrats gained sixteen seats in the election, and the Republicans lost thirteen. The sole Green member — Ralph Chapman — was replaced by a Democrat, and the number of independents was reduced from six to five, with only two independent incumbents — Kent Ackley and Norman Higgins — being re-elected.

Summary of results by State House district Italics denote an open seat held by the incumbent party; bold text denotes a gain for a party.

State House districtIncumbent PartyElected representative Party1st1st Deane Rykerson Dem Deane Rykerson Dem2nd2nd Mark W. Lawrence Dem Michele Meyer Dem3rd3rd Lydia Blume Dem Lydia Blume Dem4th4th Patricia Hymanson Dem Patricia Hymanson Dem5th5th Beth O'Connor Rep Beth O'Connor Rep6th6th Jennifer Parker Dem Tiffany Roberts-Lovell Dem7th7th Robert A. Foley Rep Daniel Hobbs Dem8th8th Christopher Babbidge Dem Christopher Babbidge Dem9th9th H. Stedman Seavey Rep Diane Denk Dem10th10th Wayne Parry Rep Henry Ingwersen Dem11th11th Ryan Fecteau Dem Ryan Fecteau Dem12th12th Martin J. Grohman Ind Victoria Foley Dem13th13th George W. Hogan Dem Lori Gramlich Dem14th14th Donna Bailey Dem Donna Bailey Dem15th15th Margaret M. O'Neil Dem Margaret M. O'Neil Dem16th16th Donald G. Marean Rep Donald G. Marean Rep17th17th Dwayne W. Prescott Rep Dwayne W. Prescott Rep18th18th Anne-Marie Mastraccio Dem Anne-Marie Mastraccio Dem19th19th Matthew Harrington Rep Matthew Harrington Rep20th20th Karen Gerrish Rep Theodore Kryzak Rep21st21st Heidi H. Sampson Rep Heidi H. Sampson Rep22nd22nd Jonathan L. Kinney Rep Mark Blier Rep23rd23rd Lester Ordway Rep Lester Ordway Rep24th24th Mark Bryant Dem Mark Bryant Dem25th25th Patrick Corey Rep Patrick Corey Rep26th26th Maureen Fitzgerald Terry Dem Maureen Fitzgerald Terry Dem27th27th Andrew McLean Dem Andrew McLean Dem28th28th Heather Sirocki Rep Christopher Caiazzo Dem29th29th Karen Vachon Rep Shawn Babine Dem30th30th Kimberly J. Monaghan Dem Anne Carney Dem31st31st Lois Galgay Reckitt Dem Lois Galgay Reckitt Dem32nd32nd Scott Hamann Dem Christopher Kessler Dem33rd33rd Kevin Battle Ind Victoria Morales Dem34th34th Andrew Gattine Dem Andrew Gattine Dem35th35th Dillon Bates Dem Ann Peoples Dem36th36th Denise Harlow Ind Michael Brennan Dem37th37th Richard Farnsworth Dem Richard Farnsworth Dem38th38th Matthew Moonen Dem Matthew Moonen Dem39th39th Michael A. Sylvester Dem Michael A. Sylvester Dem40th40th Rachel Talbot Ross Dem Rachel Talbot Ross Dem41st41st Erik Jorgensen Dem Erik Jorgensen Dem42nd42nd Benjamin Collings Dem Benjamin Collings Dem43rd43rd Heather B. Sanborn Dem W. Edward Crockett Dem44th44th Teresa Pierce Dem Teresa Pierce Dem45th45th Dale J. Denno Dem Dale J. Denno Dem46th46th Paul Chace Rep Braden Sharpe Dem47th47th Janice Cooper Dem Janice Cooper Dem48th48th Sara Gideon Dem Sara Gideon Dem49th49th Mattie Daughtry Dem Mattie Daughtry Dem50th50th Ralph Tucker Dem Ralph Tucker Dem51st51st Joyce McCreight Dem Joyce McCreight Dem52nd52nd Jennifer DeChant Dem Jennifer DeChant Dem53rd53rd Jeffrey Pierce Rep Allison Hepler Dem54th54th Denise Tepler Dem Denise Tepler Dem55th55th Seth Berry Dem Seth Berry Dem56th56th Rick Mason Rep Rick Mason Rep57th57th Stephen Wood Rep Thomas Martin Rep58th58th James R. Handy Dem James R. Handy Dem59th59th Roger Fuller Dem Margaret Craven Dem60th60th Jared Golden Dem Kristen Cloutier Dem61st61st Heidi Brooks Dem Heidi Brooks Dem62nd62nd Gina Melaragno Dem Gina Melaragno Dem63rd63rd Bruce Bickford Rep Bruce Bickford Rep64th64th Bettyann Sheats Dem Bettyann Sheats Dem65th65th Eleanor Espling Rep Amy Arata Rep66th66th Jessica Fay Dem Jessica Fay Dem67th67th Susan Austin Rep Susan Austin Rep68th68th Richard Cebra Rep Richard Cebra Rep69th69th Phyllis Ginzler Rep Walter Riseman Ind70th70th Nathan Wadsworth Rep Nathan Wadsworth Rep71st71st Tom Winsor Rep H. Sawin Millett Rep72nd72nd Kathleen Dillingham Rep Kathleen Dillingham Rep73rd73rd Lloyd Herrick Rep John Andrews Rep74th74th Christina Riley Dem Christina Riley Dem75th75th Jeff Timberlake Rep Joshua Morris Rep76th76th Gary Hilliard Rep Dennis Keschl Rep77th77th Michael D. Perkins Rep Michael D. Perkins Rep78th78th Catherine Nadeau Dem Catherine Nadeau Dem79th79th Timothy Theriault Rep Timothy Theriault Rep80th80th Richard T. Bradstreet Rep Richard T. Bradstreet Rep81st81st Craig Hickman Dem Craig Hickman Dem82nd82nd Kent Ackley Ind Kent Ackley Ind83rd83rd Gay Grant Dem Thomas Harnett Dem84th84th Charlotte Warren Dem Charlotte Warren Dem85th85th Donna Doore Dem Donna Doore Dem86th86th Matthew Pouliot Rep Justin Fecteau Rep87th87th Jeffery Hanley Rep Jeffery Hanley Rep88th88th Deborah Sanderson Rep Chloe Maxmin Dem89th89th Stephanie Hawke Rep Holly Stover Dem90th90th Michael Devin Dem Michael Devin Dem91st91st Abden Simmons Rep Jeffrey Evangelos Ind92nd92nd John Alden Spear Dem Ann Matlack Dem93rd93rd Anne Beebe-Center Dem Anne Beebe-Center Dem94th94th Owen Casas Ind Victoria Doudera Dem95th95th Paula G. Sutton Rep William Pluecker Ind96th96th Stanley Zeigler Dem Stanley Zeigler Dem97th97th Erin Herbig Dem Janice Dodge Dem98th98th James S. Gillway Rep Scott Cuddy Dem99th99th MaryAnne Kinney Rep MaryAnne Kinney Rep100th100th Kenneth Fredette Rep Danny Costain Rep101st101st David G. Haggan Rep David G. Haggan Rep102nd102nd Stacey Guerin Rep Abigail Griffin Rep103rd103rd Roger E. Reed Rep Roger E. Reed Rep104th104th Raymond Wallace Rep Steven Foster Rep105th105th Joel Stetkis Rep Joel Stetkis Rep106th106th Scott Walter Strom Rep Scott Walter Strom Rep107th107th Betty Austin Dem Betty Austin Dem108th108th John Picchiotti Rep Shelley Rudnicki Rep109th109th Thomas Longstaff Dem Bruce White Dem110th110th Colleen Madigan Dem Colleen Madigan Dem111th111th Brad Farrin Rep Philip Curtis Rep112th112th Thomas Skolfield Rep Thomas Skolfield Rep113th113th Lance Evans Harvell Rep H. Scott Landry Dem114th114th Russell Black Rep Randall Hall Rep115th115th John E. Madigan, Jr. Dem Josanne Dolloff Rep116th116th Richard Pickett Rep Richard Pickett Rep117th117th Frances Head Rep Frances Head Rep118th118th Chad Wayne Grignon Rep Chad Wayne Grignon Rep119th119th Paul Stearns Rep Paul Stearns Rep120th120th Norman Higgins Ind Norman Higgins Ind121st121st Robert Duchesne Dem Gary Drinkwater Rep122nd122nd Michelle Dunphy Dem Michelle Dunphy Dem123rd123rd Ryan Tipping Dem Ryan Tipping Dem124th124th Aaron Frey Dem Aaron Frey Dem125th125th Victoria Kornfield Dem Victoria Kornfield Dem126th126th John Schneck Dem John Schneck Dem127th127th Barbara A. Cardone Dem Barbara A. Cardone Dem128th128th Garrel Robert Craig Rep Arthur Verow Dem129th129th Peter Lyford Rep Peter Lyford Rep130th130th Richard Campbell Rep Richard Campbell Rep131st131st Karleton Ward Rep Sherman Hutchins Rep132nd132nd Louis Luchini Dem Nicole Grohoski Dem133rd133rd Ralph Chapman Green Sarah Pebworth Dem134th134th Walter Kumiega Dem Genevieve McDonald Dem135th135th Brian Hubbell Dem Brian Hubbell Dem136th136th Richard Malaby Rep William Faulkingham Rep137th137th Lawrence Lockman Rep Lawrence Lockman Rep138th138th Robert Alley Dem Robert Alley Dem139th139th William Tuell Rep William Tuell Rep140th140th Anne C. Perry Dem Anne C. Perry Dem141st141st Beth P. Turner Rep Kathy Javner Rep142nd142nd Sheldon Hanington Rep Sheldon Hanington Rep143rd143rd Stephen Stanley Dem Stephen Stanley Dem144th144th Roger Sherman Rep Gregory Swallow Rep145th145th Chris Johansen Rep Chris Johansen Rep146th146th Dustin White Rep Dustin White Rep147th147th Harold L. Stewart III Rep Harold L. Stewart III Rep148th148th David Harold McCrea Dem David Harold McCrea Dem149th149th Carol McElwee Rep John DeVeau Rep150th150th Roland Martin Dem Roland Martin Dem151st151st John L. Martin Dem John L. Martin DemNon-Voting Members Passamaquoddy Tribe Matthew Dana II Dem Rena Newell Dem Houlton Band of Maliseet Indians Henry John Bear Green N/A Source:

Predictions SourceRankingAs of Governing | October 8, 2018

Term-limited incumbents 21 incumbents (5 Democrats, 14 Republicans, one independent and one Green) were ineligible to run for a 5th consecutive term due to term limits.

Wayne Parry (R), District 10 Heather Sirocki (R), District 28 Kimberly Monaghan (D), District 30 Denise Harlow (I), District 36 Stephen Wood (R), District 57 Eleanor Espling (R), District 65 Tom Winsor (R), District 71 Jeff Timberlake (R), District 75 Deborah Sanderson (R), District 88 Erin Herbig (D), District 97 James Gillway (R), District 98 Kenneth Fredette (R), District 100 Stacey Guerin (R), District 102 Raymond Wallace (R), District 104 Thomas Longstaff (D), District 109 Russell Black (R), District 114 Louis Luchini (D), District 132 Ralph Chapman (G), District 133 Walter Kumiega (D), District 134 Richard Malaby (R), District 136 Beth Turner (R), District 141

Detailed results by State House district