Contra Costa County only accepts online applications. When viewing a job posting for a currently open examination, you can select the option that says 'Apply'.This document is the official Employment Application for Contra Costa County. It includes required personal, educational, and employment information. You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553. Welcome to Contra Costa County's on-line application process! We can help you discover rewarding career paths, find a job, write your resume and cover letters and even get ready for interviews. An incomplete application packet may disqualify an applicant. The Contra Costa County Office of Education is now providing email notifications for upcoming employment opportunities with the CCCOE. Find out why the Contra Costa County Superior Court is your Employer of Choice!