Brandywine School District voters overwhelmingly approved a referendum on the second try.
Unofficial results showed the final tally at 9,612 in favor and 5,780 against.
In a much smaller turnout in March, the referendum was narrowly defeated by a 3,729 to 3,892 margin.
The increase in property taxes will help fund the operating budget as well as a building project.
The referendum marked another victory for Gov. Jack Markell, who urged a yes vote. A similar endorsement had come before Christina School District voters approved a referendum after other failed attempts.
Opponents had focused on what they viewed as a top-heavy district administrative staff as well as overspending in other areas.
The district serves students in the north Wilmington area with a small section of the district in the City of Wilmington.
