<Li> "likely" or "favored": significant but surmountable advantage </Li> <Li> "safe" or "solid": near - certain chance of victory . </Li> <P> Of the 435 seats available, 121 seats are considered competitive (not "safe" or "solid") by at least one of the six groups making ratings . These seats are listed below . </P> <P> For a majority, Republicans need 75 of the seats on this list while Democrats need 47, assuming none of the "safe" seats flip to the other party . </P>

How many house representatives are up for reelection in 2018