General Information. Once zoning and planning approval is secured, you may complete the online Business License application and attach the approval notice.Please Download PDF BOE-571-S REV. Contra Costa County - Business License Online Application ; Select your business type ; Will your business operate inside the unincorporated areas of the county? Total of 103 forms are available for Contra Costa County for 2024. All land within a C-B community business district may be used for any of the following uses, under the following regulations set forth in this chapter. (Ord. Customer: I am a tenant in Contra Costa County, California. The success of the Housing Choice Voucher (Section 8) program depends on the participation of nonprofit and private property owners.