Contra Costa County in California requires applicants to submit proof of residency when applying for a driver's license. Proof of residency helps verify that applicants are residents of Contra Costa County and are eligible for a California driver's license. There are different types of documents that can be used as proof of residency in Contra Costa County: 1. Utility Bill: A utility bill, such as gas, water, electricity, or cable bill, is often accepted as proof of residency. It must display the applicant's name and residential address in Contra Costa County. 2. Rental/Lease Agreement: A current rental or lease agreement, indicating the applicant's name and residential address in Contra Costa County, can be used as proof of residency. 3. Mortgage Document: A mortgage statement or any official document from a financial institution indicating homeownership in Contra Costa County may serve as proof of residency. 4. Voter Registration Card: A valid and current Contra Costa County voter registration card is considered proof of residency. 5. Property Tax Statement: A property tax statement that identifies the applicant's name and address in Contra Costa County can be used as proof of residency. 6. School Enrollment Documents: If the applicant is a student, documents such as a letter of acceptance or enrollment verification from a school in Contra Costa County can be used as proof of residency. 7. Employment Records: Pay stubs, employment contracts, or a letter from an employer verifying the applicant's employment at a Contra Costa County-based company can be used as proof of residency. It is important to note that these are just a few examples of acceptable documents that can be used as proof of residency in Contra Costa County. The county may have additional requirements or acceptable documents, and it is crucial to check with the local Department of Motor Vehicles (DMV) office for the most up-to-date information.