Filing requirements. A close corporation is an attractive option for small business owners who dislike the traditional corporate formalities but cannot use an LLC.The Contra Costa Board of Education uses BoardDocs, an online meeting records system. The Contra Costa Board of Education uses BoardDocs, an online meeting records system. Contra Costa Community College District. Contra Costa County is a county located in the U.S. state of California, in the East Bay of the San Francisco Bay Area. 1 shall be included in the West Contra Costa.