CLEVELAND, Ohio - Hillary Clinton rolled to a convincing victory over Bernie Sanders in the Ohio Democratic primary Tuesday, claiming counties from Lake Erie to the Ohio River.

The 56 percent of the vote she picked up bettered her performance eight years ago, when she defeated Barack Obama in Ohio, 54 percent to 45 percent.

Based on nearly complete returns available at midnight, Clinton had won 68 counties to Sanders' nine counties.

The vote in 11 counties remained too close to call, with the margin in each of these under 50 votes. Late-arriving absentee ballots and provisional votes will be counted later.

Clinton's strongest showings were in three of the larger counties in the state. She picked up 64 percent of the vote in Cuyahoga County (Cleveland), 60 percent in Hamilton County (Cincinnati) and 59 percent in Montgomery County (Dayton).

Interestingly, despite winning Ohio in 2008, Clinton lost to Obama in all three of these counties.

Sanders ran strongest in Athens County, home to Ohio University. Sanders won 61 percent of the vote there.

Sanders also did well in four smaller northwest Ohio counties, including Wood County, home to Bowling Green State University. Sanders won 54 percent of the Wood County vote.

See the chart below for a county-by-county breakdown. The results will be updated Wednesday when complete unofficial tallies are available.

However, the official vote will not be released for a few weeks, until after the late-arriving absentee ballots and provisional ballots are counted.