Text block Body Text block Body Text block Body Online:Submit your child support application electronically and a child support professional will contact you. The new online enrollment form makes it quick and easy. Online Enrollment Form Text block Body Text block Body By Mail: Click here to download the application. Mail completed application to: OC CSS P.O. Box 22099, Santa Ana, CA 92702 Links in this section relate to Body Text block Body Text block Body In Person: Click here to download the application. Submit your application in person at: OC CSS 1055 N Main St., Santa Ana, CA 92701 Links in this section relate to Body Text block Body Video URL Opening a Child Support Case Links in this section relate to Body