You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553. To assist Contra Costa County in its commitment to Equal Employment Opportunity, applicants are asked to voluntarily provide the following information.This Employment Application Form must be filled out completely for job consideration. It includes personal, educational, and employment history sections. Click on the job title, and then Apply, to complete the application. You can use Remove if you want to delete an application without completing it. For questions, contact June at x123. What is the Close Date on a job posting? How do I complete an online application?