| 1st Barnstable Dem. 1st Barnstable (D) | Christopher FlanaganC. FlanaganFlanagan*incumbent | Uncontested | |
| 1st Berkshire Dem. 1st Berkshire (D) | John BarrettJ. BarrettBarrett*incumbent | Uncontested | |
| 1st Bristol Dem. 1st Bristol (D) | Kostas LoukosK. LoukosLoukos 52% | David MartinD. MartinMartin 37% | 78% |
| 1st Bristol Rep. 1st Bristol (R) | Michael ChaissonM. ChaissonChaisson | Uncontested | |
| 1st Essex Dem. 1st Essex (D) | Dawne ShandD. ShandShand*incumbent | Uncontested | |
| 1st Franklin Dem. 1st Franklin (D) | Natalie BlaisN. BlaisBlais*incumbent | Uncontested | |
| 1st Hampden Rep. 1st Hampden (R) | Todd SmolaT. SmolaSmola*incumbent | Uncontested | |
| 1st Hampshire Dem. 1st Hampshire (D) | Lindsay SabadosaL. SabadosaSabadosa*incumbent | Uncontested | |
| 1st Middlesex Dem. 1st Middlesex (D) | Margaret ScarsdaleM. ScarsdaleScarsdale*incumbent | Uncontested | |
| 1st Middlesex Rep. 1st Middlesex (R) | Lynne ArchambaultL. ArchambaultArchambault | Uncontested | |
| 1st Norfolk Dem. 1st Norfolk (D) | Bruce AyersB. AyersAyers*incumbent | Uncontested | |
| 1st Plymouth Dem. 1st Plymouth (D) | Michelle BadgerM. BadgerBadger | Arthur DeslogesA. DeslogesDesloges | |
| 1st Plymouth Rep. 1st Plymouth (R) | | Dee Wallace SpencerD. Wallace SpencerWallace Spencer | |
| 1st Suffolk Dem. 1st Suffolk (D) | Adrian MadaroA. MadaroMadaro*incumbent | Uncontested | |
| 1st Worcester Rep. 1st Worcester (R) | Kimberly FergusonK. FergusonFerguson*incumbent | Uncontested | |
| 2nd Barnstable Dem. 2nd Barnstable (D) | Kip DiggsK. DiggsDiggs*incumbent | Uncontested | |
| 2nd Barnstable Rep. 2nd Barnstable (R) | Susanne ConleyS. ConleyConley | Uncontested | |
| 2nd Berkshire Dem. 2nd Berkshire (D) | Tricia Farley-BouvierT. Farley-BouvierFarley-Bouvier*incumbent | Uncontested | |
| 2nd Bristol Dem. 2nd Bristol (D) | James HawkinsJ. HawkinsHawkins*incumbent | Uncontested | |
| 2nd Essex Dem. 2nd Essex (D) | Kristin KassnerK. KassnerKassner*incumbent | Uncontested | |
| 2nd Franklin Rep. 2nd Franklin (R) | Jeffrey RaymondJ. RaymondRaymond | Uncontested | |
| 2nd Hampden Dem. 2nd Hampden (D) | Brian AsheB. AsheAshe*incumbent | Uncontested | |
| 2nd Hampshire Dem. 2nd Hampshire (D) | | Uncontested | |
| 2nd Middlesex Dem. 2nd Middlesex (D) | James ArcieroJ. ArcieroArciero*incumbent | Uncontested | |
| 2nd Norfolk Dem. 2nd Norfolk (D) | Tackey ChanT. ChanChan*incumbent | Uncontested | |
| 2nd Norfolk Rep. 2nd Norfolk (R) | Sharon CintoloS. CintoloCintolo | Uncontested | |
| 2nd Plymouth Rep. 2nd Plymouth (R) | John GaskeyJ. GaskeyGaskey 59% | Susan Williams-GiffordS. Williams-GiffordWilliams-Gifford*incumbent 41% | >95% |
| 2nd Suffolk Dem. 2nd Suffolk (D) | Daniel RyanD. RyanRyan*incumbent | Uncontested | |
| 2nd Worcester Dem. 2nd Worcester (D) | Jonathan ZlotnikJ. ZlotnikZlotnik*incumbent | Uncontested | |
| 2nd Worcester Rep. 2nd Worcester (R) | Bruce ChesterB. ChesterChester | Uncontested | |
| 3rd Barnstable Dem. 3rd Barnstable (D) | Kathleen Fox AlfanoK. Fox AlfanoFox Alfano | Uncontested | |
| 3rd Barnstable Rep. 3rd Barnstable (R) | David VieiraD. VieiraVieira*incumbent | Uncontested | |
| 3rd Berkshire Dem. 3rd Berkshire (D) | Leigh DavisL. DavisDavis 56% | Patrick WhiteP. WhiteWhite 38% | >95% |
| 3rd Bristol Dem. 3rd Bristol (D) | Carol DohertyC. DohertyDoherty*incumbent | Uncontested | |
| 3rd Essex Dem. 3rd Essex (D) | Andres VargasA. VargasVargas*incumbent | Uncontested | |
| 3rd Hampden Rep. 3rd Hampden (R) | Nicholas BoldygaN. BoldygaBoldyga*incumbent | Uncontested | |
| 3rd Hampshire Dem. 3rd Hampshire (D) | Mindy DombM. DombDomb*incumbent | Uncontested | |
| 3rd Middlesex Dem. 3rd Middlesex (D) | Kate HoganK. HoganHogan*incumbent | Uncontested | |
| 3rd Norfolk Dem. 3rd Norfolk (D) | Ronald MarianoR. MarianoMariano*incumbent | Uncontested | |
| 3rd Plymouth Dem. 3rd Plymouth (D) | Joan MeschinoJ. MeschinoMeschino*incumbent | Uncontested | |
| 3rd Suffolk Dem. 3rd Suffolk (D) | Aaron MichlewitzA. MichlewitzMichlewitz*incumbent | Uncontested | |
| 3rd Worcester Dem. 3rd Worcester (D) | Michael KushmerekM. KushmerekKushmerek*incumbent | Uncontested | |
| 4th Barnstable Dem. 4th Barnstable (D) | Hadley LuddyH. LuddyLuddy | Uncontested | |
| 4th Bristol Rep. 4th Bristol (R) | Steven HowittS. HowittHowitt*incumbent | Uncontested | |
| 4th Essex Dem. 4th Essex (D) | Estela ReyesE. ReyesReyes*incumbent | Uncontested | |
| 4th Hampden Dem. 4th Hampden (D) | Bridget Matthews-KaneB. Matthews-KaneMatthews-Kane | Uncontested | |
| 4th Hampden Rep. 4th Hampden (R) | Kelly PeaseK. PeasePease*incumbent | Uncontested | |
| 4th Middlesex Dem. 4th Middlesex (D) | Danielle GregoireD. GregoireGregoire*incumbent | Uncontested | |
| 4th Norfolk Dem. 4th Norfolk (D) | James MurphyJ. MurphyMurphy*incumbent | Uncontested | |
| 4th Plymouth Dem. 4th Plymouth (D) | Patrick KearneyP. KearneyKearney*incumbent | Uncontested | |
| 4th Suffolk Dem. 4th Suffolk (D) | David BieleD. BieleBiele*incumbent | Uncontested | |
| 4th Worcester Dem. 4th Worcester (D) | Natalie HigginsN. HigginsHiggins*incumbent | Uncontested | |
| 4th Worcester Rep. 4th Worcester (R) | Salvatore PerlaS. PerlaPerla | Uncontested | |
| 5th Barnstable Dem. 5th Barnstable (D) | Owen FletcherO. FletcherFletcher | Uncontested | |
| 5th Barnstable Rep. 5th Barnstable (R) | Steven XiarhosS. XiarhosXiarhos*incumbent | Uncontested | |
| 5th Bristol Dem. 5th Bristol (D) | Patricia HaddadP. HaddadHaddad*incumbent | Uncontested | |
| 5th Bristol Rep. 5th Bristol (R) | Justin ThurberJ. ThurberThurber | Uncontested | |
| 5th Essex Dem. 5th Essex (D) | Ann-Margaret FerranteA. FerranteFerrante*incumbent | Uncontested | |
| 5th Hampden Dem. 5th Hampden (D) | Patricia DuffyP. DuffyDuffy*incumbent | Uncontested | |
| 5th Middlesex Dem. 5th Middlesex (D) | David LinskyD. LinskyLinsky*incumbent 73% | Jaymin PatelJ. PatelPatel 27% | 86% |
| 5th Norfolk Dem. 5th Norfolk (D) | Mark CusackM. CusackCusack*incumbent | Uncontested | |
| 5th Plymouth Rep. 5th Plymouth (R) | David DeCosteD. DeCosteDeCoste*incumbent | Uncontested | |
| 5th Suffolk Dem. 5th Suffolk (D) | Christopher WorrellC. WorrellWorrell*incumbent | Uncontested | |
| 5th Worcester Rep. 5th Worcester (R) | Donald BerthiaumeD. BerthiaumeBerthiaume*incumbent | Uncontested | |
| 6th Bristol Dem. 6th Bristol (D) | Carole FiolaC. FiolaFiola*incumbent | Uncontested | |
| 6th Essex Dem. 6th Essex (D) | Jerald ParisellaJ. ParisellaParisella*incumbent | Uncontested | |
| 6th Essex Rep. 6th Essex (R) | | Uncontested | |
| 6th Hampden Dem. 6th Hampden (D) | Michael FinnM. FinnFinn*incumbent | Uncontested | |
| 6th Middlesex Dem. 6th Middlesex (D) | Priscila SousaP. SousaSousa*incumbent | Uncontested | |
| 6th Norfolk Dem. 6th Norfolk (D) | William C. GalvinW. GalvinGalvin*incumbent | Uncontested | |
| 6th Plymouth Dem. 6th Plymouth (D) | Rebecca ColettaR. ColettaColetta | Uncontested | |
| 6th Plymouth Rep. 6th Plymouth (R) | Kenneth SweezeyK. SweezeySweezey 53% | Jane CournanJ. CournanCournan 47% | >95% |
| 6th Suffolk Dem. 6th Suffolk (D) | Russell HolmesR. HolmesHolmes*incumbent | Haris HardawayH. HardawayHardaway | |
| 6th Worcester Dem. 6th Worcester (D) | Jeanne CostelloJ. CostelloCostello | Uncontested | |
| 6th Worcester Rep. 6th Worcester (R) | John MarsiJ. MarsiMarsi*incumbent | Uncontested | |
| 7th Bristol Dem. 7th Bristol (D) | Alan SilviaA. SilviaSilvia*incumbent | Uncontested | |
| 7th Essex Dem. 7th Essex (D) | Manny CruzM. CruzCruz*incumbent | Uncontested | |
| 7th Hampden Dem. 7th Hampden (D) | Aaron SaundersA. SaundersSaunders*incumbent | Uncontested | |
| 7th Middlesex Dem. 7th Middlesex (D) | Jack LewisJ. LewisLewis*incumbent 83% | Carlton PhelpsC. PhelpsPhelps 17% | >95% |
| 7th Norfolk Dem. 7th Norfolk (D) | Richard WellsR. WellsWells 36% | Christos AlexopoulosC. AlexopoulosAlexopoulos 32% | >95% |
| 7th Plymouth Rep. 7th Plymouth (R) | Alyson Sullivan-AlmeidaA. Sullivan-AlmeidaSullivan-Almeida*incumbent | Uncontested | |
| 7th Suffolk Dem. 7th Suffolk (D) | Chynah TylerC. TylerTyler*incumbent | Uncontested | |
| 7th Worcester Rep. 7th Worcester (R) | Paul FrostP. FrostFrost*incumbent 82% | Michelle FrigonM. FrigonFrigon 18% | 95% |
| 8th Bristol Dem. 8th Bristol (D) | Steven OuelletteS. OuelletteOuellette | Uncontested | |
| 8th Essex Dem. 8th Essex (D) | Jennifer ArminiJ. ArminiArmini*incumbent | Uncontested | |
| 8th Hampden Dem. 8th Hampden (D) | Shirley ArriagaS. ArriagaArriaga*incumbent | Uncontested | |
| 8th Middlesex Dem. 8th Middlesex (D) | James Arena-DeRosaJ. Arena-DeRosaArena-DeRosa*incumbent | Uncontested | |
| 8th Norfolk Dem. 8th Norfolk (D) | Ted PhilipsT. PhilipsPhilips*incumbent | Uncontested | |
| 8th Plymouth Dem. 8th Plymouth (D) | Dennis GallagherD. GallagherGallagher | Uncontested | |
| 8th Plymouth Rep. 8th Plymouth (R) | Sandra WrightS. WrightWright | Uncontested | |
| 8th Suffolk Dem. 8th Suffolk (D) | Jay LivingstoneJ. LivingstoneLivingstone*incumbent 83% | | >95% |
| 8th Worcester Rep. 8th Worcester (R) | Michael SoterM. SoterSoter*incumbent | Uncontested | |
| 9th Bristol Dem. 9th Bristol (D) | Christopher MarkeyC. MarkeyMarkey*incumbent | Uncontested | |
| 9th Essex Rep. 9th Essex (R) | Donald WongD. WongWong*incumbent | Uncontested | |
| 9th Hampden Dem. 9th Hampden (D) | Orlando RamosO. RamosRamos*incumbent | Uncontested | |
| 9th Middlesex Dem. 9th Middlesex (D) | Thomas StanleyT. StanleyStanley*incumbent 58% | | >95% |
| 9th Middlesex Rep. 9th Middlesex (R) | | Uncontested | |
| 9th Norfolk Dem. 9th Norfolk (D) | Kevin KalkutK. KalkutKalkut | Uncontested | |
| 9th Norfolk Rep. 9th Norfolk (R) | Marcus VaughnM. VaughnVaughn*incumbent | Uncontested | |
| 9th Plymouth Dem. 9th Plymouth (D) | Bridget PlouffeB. PlouffePlouffe | Uncontested | |
| 9th Plymouth Rep. 9th Plymouth (R) | Lawrence NovakL. NovakNovak | Uncontested | |
| 9th Suffolk Dem. 9th Suffolk (D) | John MoranJ. MoranMoran*incumbent | Uncontested | |
| 9th Suffolk Rep. 9th Suffolk (R) | | Uncontested | |
| 9th Worcester Rep. 9th Worcester (R) | David MuradianD. MuradianMuradian*incumbent | Uncontested | |
| 10th Bristol Dem. 10th Bristol (D) | Mark SylviaM. SylviaSylvia | Uncontested | |
| 10th Bristol Rep. 10th Bristol (R) | Joseph PiresJ. PiresPires 63% | Robert McConnellR. McConnellMcConnell 37% | 72% |
| 10th Essex Dem. 10th Essex (D) | Daniel CahillD. CahillCahill*incumbent | Uncontested | |
| 10th Hampden Dem. 10th Hampden (D) | Carlos GonzalezC. GonzalezGonzalez*incumbent | Uncontested | |
| 10th Middlesex Dem. 10th Middlesex (D) | John LawnJ. LawnLawn*incumbent | Uncontested | |
| 10th Norfolk Dem. 10th Norfolk (D) | Jeffrey RoyJ. RoyRoy*incumbent | Uncontested | |
| 10th Norfolk Rep. 10th Norfolk (R) | Charles BaileyC. BaileyBailey | Uncontested | |
| 10th Plymouth Dem. 10th Plymouth (D) | Michelle DuBoisM. DuBoisDuBois*incumbent | Uncontested | |
| 10th Suffolk Dem. 10th Suffolk (D) | William MacGregorW. MacGregorMacGregor*incumbent | Uncontested | |
| 10th Worcester Dem. 10th Worcester (D) | Brian MurrayB. MurrayMurray*incumbent | Uncontested | |
| 11th Bristol Dem. 11th Bristol (D) | Christopher HendricksC. HendricksHendricks*incumbent | Uncontested | |
| 11th Essex Dem. 11th Essex (D) | | | >95% |
| 11th Hampden Dem. 11th Hampden (D) | Bud WilliamsB. WilliamsWilliams*incumbent 54% | Johnnie McKnightJ. McKnightMcKnight 46% | >95% |
| 11th Middlesex Dem. 11th Middlesex (D) | Amy Mah SangioloA. Mah SangioloMah Sangiolo 83% | Alexander JablonA. JablonJablon 17% | >95% |
| 11th Middlesex Rep. 11th Middlesex (R) | Vladislav YanovskyV. YanovskyYanovsky | Uncontested | |
| 11th Norfolk Dem. 11th Norfolk (D) | Paul McMurtryP. McMurtryMcMurtry*incumbent | Uncontested | |
| 11th Plymouth Dem. 11th Plymouth (D) | Rita MendesR. MendesMendes*incumbent 78% | Fred FontaineF. FontaineFontaine 22% | 85% |
| 11th Suffolk Dem. 11th Suffolk (D) | Judith GarciaJ. GarciaGarcia*incumbent | Uncontested | |
| 11th Worcester Rep. 11th Worcester (R) | Hannah KaneH. KaneKane*incumbent | Uncontested | |
| 12th Bristol Rep. 12th Bristol (R) | Norman OrrallN. OrrallOrrall*incumbent | Uncontested | |
| 12th Essex Dem. 12th Essex (D) | Thomas WalshT. WalshWalsh*incumbent | Uncontested | |
| 12th Hampden Dem. 12th Hampden (D) | Angelo PuppoloA. PuppoloPuppolo*incumbent | Uncontested | |
| 12th Middlesex Dem. 12th Middlesex (D) | Greg SchwartzG. SchwartzSchwartz 40% | Bill HumphreyB. HumphreyHumphrey 30% | >95% |
| 12th Norfolk Dem. 12th Norfolk (D) | John RogersJ. RogersRogers*incumbent | Uncontested | |
| 12th Plymouth Dem. 12th Plymouth (D) | Kathleen LaNatraK. LaNatraLaNatra*incumbent | Uncontested | |
| 12th Plymouth Rep. 12th Plymouth (R) | Eric MeschinoE. MeschinoMeschino | Uncontested | |
| 12th Suffolk Dem. 12th Suffolk (D) | Brandy Fluker OakleyB. Fluker OakleyFluker Oakley*incumbent | Uncontested | |
| 12th Worcester Dem. 12th Worcester (D) | Meghan KilcoyneM. KilcoyneKilcoyne*incumbent | Uncontested | |
| 13th Bristol Dem. 13th Bristol (D) | Antonio CabralA. CabralCabral*incumbent | Uncontested | |
| 13th Essex Dem. 13th Essex (D) | Sally KeransS. KeransKerans*incumbent | Uncontested | |
| 13th Middlesex Dem. 13th Middlesex (D) | Carmine GentileC. GentileGentile*incumbent | Uncontested | |
| 13th Norfolk Dem. 13th Norfolk (D) | Joshua TarskyJ. TarskyTarsky 61% | Patrick GattoP. GattoGatto 32% | 19% |
| 13th Suffolk Dem. 13th Suffolk (D) | Daniel HuntD. HuntHunt*incumbent | Uncontested | |
| 13th Worcester Dem. 13th Worcester (D) | John MahoneyJ. MahoneyMahoney*incumbent | Uncontested | |
| 14th Bristol Dem. 14th Bristol (D) | Adam ScanlonA. ScanlonScanlon*incumbent | Uncontested | |
| 14th Bristol Rep. 14th Bristol (R) | David CannataD. CannataCannata | Uncontested | |
| 14th Essex Dem. 14th Essex (D) | Adrianne RamosA. RamosRamos*incumbent | Uncontested | |
| 14th Middlesex Dem. 14th Middlesex (D) | Simon CataldoS. CataldoCataldo*incumbent | Uncontested | |
| 14th Norfolk Dem. 14th Norfolk (D) | Alice PeischA. PeischPeisch*incumbent | Uncontested | |
| 14th Suffolk Dem. 14th Suffolk (D) | Rob ConsalvoR. ConsalvoConsalvo*incumbent | Uncontested | |
| 14th Worcester Dem. 14th Worcester (D) | James O’DayJ. O’DayO’Day*incumbent | Uncontested | |
| 15th Essex Dem. 15th Essex (D) | Ryan HamiltonR. HamiltonHamilton*incumbent | Uncontested | |
| 15th Middlesex Dem. 15th Middlesex (D) | Michelle CiccoloM. CiccoloCiccolo*incumbent | Uncontested | |
| 15th Norfolk Dem. 15th Norfolk (D) | Tommy VitoloT. VitoloVitolo*incumbent | Uncontested | |
| 15th Suffolk Dem. 15th Suffolk (D) | Samantha MontanoS. MontanoMontano*incumbent | Uncontested | |
| 15th Worcester Dem. 15th Worcester (D) | Mary KeefeM. KeefeKeefe*incumbent | Uncontested | |
| 16th Essex Dem. 16th Essex (D) | Francisco PaulinoF. PaulinoPaulino*incumbent | Marcos DeversM. DeversDevers | |
| 16th Middlesex Dem. 16th Middlesex (D) | Rodney ElliottR. ElliottElliott*incumbent | Uncontested | |
| 16th Suffolk Dem. 16th Suffolk (D) | Jessica Ann GianninoJ. GianninoGiannino*incumbent | Uncontested | |
| 16th Worcester Dem. 16th Worcester (D) | Daniel DonahueD. DonahueDonahue*incumbent | Uncontested | |
| 17th Essex Dem. 17th Essex (D) | Frank MoranF. MoranMoran*incumbent | Uncontested | |
| 17th Middlesex Dem. 17th Middlesex (D) | Vanna HowardV. HowardHoward*incumbent | Uncontested | |
| 17th Suffolk Dem. 17th Suffolk (D) | Kevin HonanK. HonanHonan*incumbent | Uncontested | |
| 17th Worcester Dem. 17th Worcester (D) | David LeBoeufD. LeBoeufLeBoeuf*incumbent | Uncontested | |
| 18th Essex Dem. 18th Essex (D) | Tram NguyenT. NguyenNguyen*incumbent | Uncontested | |
| 18th Middlesex Dem. 18th Middlesex (D) | | Rady MomR. MomMom*incumbent 40% | >95% |
| 18th Suffolk Dem. 18th Suffolk (D) | Michael MoranM. MoranMoran*incumbent | Uncontested | |
| 18th Worcester Rep. 18th Worcester (R) | Joseph McKennaJ. McKennaMcKenna*incumbent | Uncontested | |
| 19th Middlesex Dem. 19th Middlesex (D) | David RobertsonD. RobertsonRobertson*incumbent | Uncontested | |
| 19th Middlesex Rep. 19th Middlesex (R) | Paul SarnowskiP. SarnowskiSarnowski | Uncontested | |
| 19th Suffolk Dem. 19th Suffolk (D) | Jeffrey TurcoJ. TurcoTurco*incumbent | Uncontested | |
| 19th Worcester Dem. 19th Worcester (D) | Kate DonaghueK. DonaghueDonaghue*incumbent | Uncontested | |
| 20th Middlesex Rep. 20th Middlesex (R) | Bradley JonesB. JonesJones*incumbent | Uncontested | |
| 21st Middlesex Dem. 21st Middlesex (D) | Kenneth GordonK. GordonGordon*incumbent | Uncontested | |
| 22nd Middlesex Rep. 22nd Middlesex (R) | Marc LombardoM. LombardoLombardo*incumbent | Uncontested | |
| 23rd Middlesex Dem. 23rd Middlesex (D) | Sean GarballeyS. GarballeyGarballey*incumbent | Uncontested | |
| 24th Middlesex Dem. 24th Middlesex (D) | David RogersD. RogersRogers*incumbent | Uncontested | |
| 25th Middlesex Dem. 25th Middlesex (D) | Marjorie DeckerM. DeckerDecker*incumbent | Evan MacKayE. MacKayMacKay | |
| 26th Middlesex Dem. 26th Middlesex (D) | Mike ConnollyM. ConnollyConnolly*incumbent | Uncontested | |
| 27th Middlesex Dem. 27th Middlesex (D) | Erika UyterhoevenE. UyterhoevenUyterhoeven*incumbent 69% | Kathleen HornbyK. HornbyHornby 31% | >95% |
| 28th Middlesex Dem. 28th Middlesex (D) | Joseph McGonagleJ. McGonagleMcGonagle*incumbent 68% | Michael MarcheseM. MarcheseMarchese 32% | >95% |
| 29th Middlesex Dem. 29th Middlesex (D) | Steven OwensS. OwensOwens*incumbent | Uncontested | |
| 30th Middlesex Dem. 30th Middlesex (D) | Richard HaggertyR. HaggertyHaggerty*incumbent | Uncontested | |
| 31st Middlesex Dem. 31st Middlesex (D) | Michael DayM. DayDay*incumbent | Uncontested | |
| 32nd Middlesex Dem. 32nd Middlesex (D) | Kate Lipper-GarabedianK. Lipper-GarabedianLipper-Garabedian*incumbent | Uncontested | |
| 33rd Middlesex Dem. 33rd Middlesex (D) | Steven UltrinoS. UltrinoUltrino*incumbent | Uncontested | |
| 34th Middlesex Dem. 34th Middlesex (D) | Christine BarberC. BarberBarber*incumbent | Uncontested | |
| 35th Middlesex Dem. 35th Middlesex (D) | Paul DonatoP. DonatoDonato*incumbent 55% | Nichole MossalamN. MossalamMossalam 35% | >95% |
| 36th Middlesex Dem. 36th Middlesex (D) | Colleen GarryC. GarryGarry*incumbent | Uncontested | |
| 37th Middlesex Dem. 37th Middlesex (D) | Danillo SenaD. SenaSena*incumbent | Uncontested | |
| Barnstable, Dukes & Nantucket Dem. Barnstable, Dukes & Nantucket (D) | Thomas MoakleyT. MoakleyMoakley 57% | Arielle FariaA. FariaFaria 43% | >95% |
