The Housing Authority of the County of Contra Costa accepts pre-applications online when we anticipate housing becoming available within a few months. Home seekers must be at least 18 years of age; live, work, or go to school in Contra Costa County; complete a background check; and meet income requirements.1-866-403-2683 or fill out an application for help directly on their website. Navigating resources can be hard, and we can help you figure out your options. View Housing Authority of the County of Contra Costa in Martinez, CA. View photos, get pricing, and see if you qualify for public housing and section 8. We may be able to provide one-time assistance with move-in costs, deposits, locating housing, or short-term rental payments. We help gather and fill out all necessary forms, a seemingly simple task that can often be a barrier to obtaining needed assistance. Application Deadlines. These are designed for those who struggle with high rental costs in the county. Apply for rental assistance immediately.