Over eight days of early voting in Maryland, about 4 percent of the state’s nearly 3.4 million eligible voters cast ballots for the June 24 primary. Nearly three-quarters of those voters were Democrats, who outnumber Republicans in registration in the state by more than 2-to-1.

A total of 141,590 Marylanders participated in early voting, which started on June 12 and ended Thursday, which was the busiest day with 29,960 voters. Some state leaders worry that voter turnout will be lower than usual at the polls on Tuesday, as this is the first time Maryland has held its primary in June instead of September to give election officials more time to prepare general election ballots for troops serving overseas.

The early voting total for this primary is more than the last gubernatorial primary in 2010, which was the first time that Maryland allowed it. Since then, the state has increased the number of early voting days and locations. But this month’s total is less than the number of people who voted early during November general elections in 2010 and 2012.

While numbers were highest in the state’s most populous areas — including Baltimore, Prince George’s and Montgomery counties — the rate of participation was highest in the Eastern Shore counties of Talbot, Kent and Queen Anne’s.