SARAJEVO (Reuters) - Bosnians turned out in large numbers for parliamentary elections on Sunday to choose politicians who will lead the deeply-divided impoverished Balkan nation after international supervision ends next year.

The preliminary turnout figure was 43.9 percent, election organizers said. But more people went to the polls than in 2002, when the turnout was 55 percent, because the number of registered voters has risen by 400,000 to 2.75 million.

"The turnout figure should be much higher after we get data from 16 bigger municipalities," said election commission head Branko Petric.

Bosnians voted for Serb, Croat and Muslim members of the presidency and parliament as well as the president and two vice-presidents in the Serb Republic. They also cast ballots for the assemblies of the two regions and 10 federation cantons.

Preliminary results for the state presidency are expected late on Sunday. Others will not be known before Monday because of a complex process of counting the votes and allocating mandates for Bosnia's multi-layer government structure.