The 6th Street Playhouse ensemble for 'August: Osage County': (from left ): Elizabeth Woodruff, Alan Kaplan, Craig A. Miller, Jill Zimmerman, Mollie Boice, Chris Schloemp and Ron Smith. (Photo by Eric Chazankin.)

The 6th Street Playhouse in Santa Rosa has won six awards from the San Francisco/Bay Area Theatre Critics Circle for 2012.

The Playhouse won for best ensemble performing in a theater with 100-300 seats for its production of “August: Osage County.”

The show also won awards in that division for Jill Zimmerman, as best principal female in a play; John Browning, best featured male in a play, and Marty Pistone “best specialty,” for his fight choreography.

For its Studio Theater production of “Souvenir,” the Playhouse won two awards in the size division for theaters with less than 100 seats: Mary Gannon Graham, for best principal female in a play, John Shillington, for best principal male in a play.

In addition to its winning entries, the Playhouse was nominated in a dozen other categories, for a total of 18. Included were nominations for the Playhouse productions of “The Marvelous Wonderettes” and “It’s a Wonderful Life.”

Two other Sonoma County theater companies also were nominated, with two for “110 in the Shade” at the Cinnabar Theater in Petaluma, and six for “Camelot,” staged by the New Spreckels Theatre Company in Rohnert Park.

The winners were announced earlier this month in Oakland.