The top front-page story in the Orange County Register published March 9th, 2011, and updated March 11th, 2011, carried this headline:

GROWTH CHANGES FACE OF O.C.

This story is also posted online. Here are a few excerpts:

O.C. lost whites, gained Hispanics and Asians, census shows By RONALD CAMPBELL, DOUG IRVING and PEGGY LOWE THE ORANGE COUNTY REGISTER
www.ocregister.com/articles/county-291335-census-population.html?pic=1

California's population would have dropped over the past two decades were it not for a huge increase in Hispanics and Asians, 2010 census figures released Tuesday show.

The trend is the same in Orange County as it is for the state: Whites have been decreasing in large numbers since 1990, while Hispanics and Asians increased. The shifting demographics have helped Anaheim pass Santa Ana as the county's biggest city, with Irvine now a distant third.

The census, completed last year, bears the scars of the national recession - from the number of homes found vacant here to the explosive growth of the less-expensive Inland Empire. It shows that Orange County grew by about 6 percent in the past decade and is now the third most populous county in California, after Los Angeles and San Diego, with a little more than 3 million people.

A graphic included with this March 9th Orange County Register story reported Garden Grove is the fifth most populous city in Orange County. Garden Grove's population in 2010 was 170,883 people. Only Anaheim, Santa Ana, Irvine and Huntington Beach had more people in 2010 than Garden Grove.

See this graphic below. For the full graphic, click on the Orange County Register link:
www.ocregister.com/articles/county-291335-census-population.html?pic=1

The total population Orange County was 3.0 million in 2010 compared to 2.8 million in 2000 and 2.4 million in 1990. The March 9th Orange County Register article also contains a nice graphic portraying this change.

All of these data are from the U.S. Census Bureau.