Some county voters are confused because they have received an absentee mail ballot even though they didn't ask for one.
New voting precinct boundaries resulted in 70 new precincts, including 60 new permanent mail precincts.
Census redistricting moved the county supervisorial boundaries and county Registrar of Voters Dolores Provencio took the opportunity to redraw voting precincts.
"The changes allow us to work specifically with voters in a special district," Provencio said.
The changes save the county money on printing ballots, lessen confusion for polling place workers and make counting easier, she said.
For example, Provencio said, precinct 336A was in supervisors' District 3 and had five parts.
Part one voted for Imperial Valley College trustee District 1, the Holtville school board and Imperial Irrigation District Division 5.
Part two voted for Imperial Valley College trustee District 2, Meadows and Central Union High school boards and was in IID Division 3.