The San Diego County Board of Supervisors tentatively passed a redistricting ordinance on Tuesday.
The measure was unanimously approved on first reading and is scheduled for a final vote in two weeks.
"All in all, we have a map that is certainly in compliance with the Voting Rights Act of 1965,'' said Supervisor Greg Cox. "It's one that reaches, I think, a good balance for each of the supervisorial districts.''
The map has five districts with total populations ranging from 608,340 to 627,639 and creates one district, Cox's, that is one-third white in its voting-age population.
The ordinance, once approved, will authorize the Registrar of Voters to prepare maps and election files for the June 5, 2012, primary and notify registered voters whose districts have changed.
Legislative districts are redrawn every 10 years in accordance with updated census data, and have to satisfy a number of legal requirements.
City News Service contributed to this report.