Sonoma County, the state's 17th largest county with 483,878 residents, long has been divided into three Assembly and two state Senate districts.
The 40 Senate districts are required to have 931,349 residents in the 2011 redistricting, with an allowed variance of up to 5 percent.
The 80 Assembly districts are to have 465,674 residents, with the same variance.
Senate District 2, with 897,433 residents, covers Humboldt, Mendocino, Lake and Napa counties and parts of Solano and Sonoma, excluding Rohnert Park and the south county.
Senate District 3, with 880,421 residents falls below the variance,and covers Marin, part of San Francisco and the balance of Sonoma County.
The three Assembly districts all fall below the target population but only the 6th District falls below the variance.
Assembly District 1, with 443,842 residents, includes Del Norte, Humboldt, Trinity, Mendocino and Lake counties and all of Sonoma County from Windsor north, including the west county and coast.
Assembly District 6, with 433,034 residents, covers Marin and southern Sonoma up to Rohnert Park.
Assembly District 7, with 453,345 residents, covers Napa County, a slice of Solano County including Vallejo, with a finger reaching into Sonoma County, including Santa Rosa.
One of the principles for redistricting this year is nesting, which means, if possible, that each Senate district would contain 2 Assembly districts. But other criteria, given a higher priority, require districts to be contiguous, compact and to respect city and county boundaries and "communities of interest."
The redistricting commission is not allowed to consider voter registration numbers or incumbents' residences.
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