Elections in Central America
Via the BBC: El Salvador votes for new president
The main rivals are current Vice-President Salvador Sanchez Ceren of the left-wing FMLN party and Norman Quijano of the conservative Arena alliance.
Neither is expected to win outright because a third candidate standing for a new independent party is likely to make a strong showing.
Mr Sanchez Ceren. 69, was a rebel commander when the Farabundo Marti National Liberation Front (FMLN) was a guerrilla group during the 1980-1992 civil war.
If a second round is needed, it will take place on March 9.
And, also, via the BBC: Costa Rica holds presidential elections
The governing party’s Johnny Araya, a former mayor of San Jose, is expected to face strong opposition from left-wing candidate Jose Maria Villalta.
Centre-left politician Luis Guillermo Solis is also seen as a contender.
With many voters undecided, pollsters are predicting a tight race. If no candidate wins outright, there will be a run-off on 6 April.