You may complete an on-line application at the Contra Costa Human Resources Department at 651 Pine St., 2nd Floor, Martinez, CA 94553. Contra Costa County is seeking talented and qualified individuals to fill clerical vacancies throughout the County!The Contra Costa County Office of Education is now providing email notifications for upcoming employment opportunities with the CCCOE. The first step to get help with paying your fees and tuition is to submit an application for financial assistance. Consider our FREE Externship Program, to learn about careers at Central San and in wastewater! Those interested in attending the Job Fair can fill out an interest form. Superior Court of California County of Contra Costa. Definition of annual income, how the housing authority verifies income – overview, information regarding verification of specific income type. Candidates are required to complete the PSSA through thier candidate account for this position. Salary.