LOS ANGELES — A new study says nearly a quarter of the nation's illegal immigrants live in California.

A Pew Hispanic Center report released Wednesday also says illegal immigrants comprise 6.9 percent of California's population — the highest percentage in the country.

Overall, the number of illegal immigrants in the United States has dropped for the first time in 20 years, with California housing 23 percent of the country's 11.1 million immigrants.

The study also says 9.3 percent of California's workforce is illegal labor — second highest in the nation.

The study, based on 2009 statistics, did not include California comparisons to earlier years.