Child Support in Oakland and Alameda County, California

Alameda County spans the East Bay from Oakland and Berkeley south through Hayward, San Leandro, and Fremont, making it one of the more densely populated and diverse counties in the state. Despite that geographic spread, the Superior Court of California, County of Alameda centralizes family law filings, including child support matters, at a single courthouse: the Hayward Hall of Justice at 24405 Amador Street in Hayward. Families can also work directly with the Alameda County Department of Child Support Services (ACDCSS), the county's local child support agency, which is based in Pleasanton.

Child support across California, including in Alameda County, is set using a single statewide guideline formula written into Family Code section 4055. The formula relies on both parents' net disposable incomes and the timeshare, meaning the proportion of time the child lives with or is cared for by each parent, and treats the resulting number as presumptively correct.

Getting to a support order in Alameda County works one of two ways. A parent already in a divorce, parentage, or custody case can file a Request for Order (Form FL-300) with an Income and Expense Declaration (Form FL-150) at the Hayward Hall of Justice, since that is where the Alameda County Superior Court's Family Law Division handles all family law case filings countywide, not at the Oakland or Fremont courthouses. Or the Alameda County Department of Child Support Services, part of the statewide network of local child support agencies overseen by the California Department of Child Support Services, can open its own case from its Pleasanton office to establish and collect support. Because the forms themselves are set at the state level, what's specific to Alameda County is simply which courthouse hears the matter and where the local agency's office sits.

If you want a sense of the number before filing, use our free California child support calculator. When both parents already agree on an amount, they can skip a contested hearing and submit a written stipulation for a judge to sign.

How child support is calculated in California

California sets child support with a statewide uniform guideline (Family Code section 4055) that applies the same way in Alameda County as everywhere else. The formula is based mainly on two things:

1. Both parents' net disposable incomes.
2. The percentage of time the child spends with each parent (the timeshare).

The guideline amount is presumed to be correct, and courts use a calculator to run the numbers. Because the result depends on accurate income, the Income and Expense Declaration (Form FL-150) you file is what drives your number.

Where child support cases are handled in Alameda County

Child support in Alameda County is handled through the Superior Court of California, County of Alameda, and the county's Local Child Support Agency, which is part of the California Department of Child Support Services. There are two common paths:

1. Either parent files a Request for Order (Form FL-300) with an Income and Expense Declaration (Form FL-150) inside a divorce, parentage, or custody case.
2. The Local Child Support Agency opens a case to establish, collect, and enforce support, often at no cost to the parents.

Because courthouse and local agency office details change over time, confirm current details using the official California Courts court finder:

Find the Alameda County Superior Court (official California Courts finder)

Local notes for Alameda County

Alameda County directs all family law filings, including child support matters, to the Hayward Hall of Justice at 24405 Amador Street in Hayward; confirm current filing procedures on the Alameda County Superior Court's Family Law Division page or the official California Courts court finder before you file. The court's Family Law Division also offers e-filing for family law case types (mandatory for attorneys, optional for self-represented parents) as an alternative to filing in person at Hayward. The Alameda County Department of Child Support Services (ACDCSS) operates its own office in Pleasanton, separate from the court; you can find current information through its website or the statewide California Department of Child Support Services site.

The court's Self-Help Center and Family Law Facilitator's Office, also located at the Hayward Hall of Justice, assists parents representing themselves with filling out Form FL-150 and other required paperwork and can explain the general court process, though staff cannot give legal advice tailored to your situation. Because the guideline result is driven almost entirely by the income figures reported, careful and honest completion of that form matters more than anything else you file.

Child support in Alameda County generally continues until the child turns 18, or 19 if the child is a full-time high school student still living at home and not self-supporting. Either parent can come back to court and ask for a modification if income or the parenting timeshare later changes.

Official child support resources in Alameda County

Alameda County Superior Court centralizes family law filings at one location: the Hayward Hall of Justice, 24405 Amador Street, Hayward, CA 94544. Every family law case type, including divorce, parentage, custody, and child support, is filed there rather than at the Oakland or Fremont courthouses, and the court's Family Law Division also offers e-filing for family law case types as an alternative to filing in person.

The Alameda County Department of Child Support Services (ACDCSS) is the county's local child support agency, part of the statewide network overseen by the California Department of Child Support Services. Its office is based in Pleasanton, and it can open a case on a parent's behalf to establish paternity, set a support order, and enforce an existing order, separately from anything filed at the court.

The court's Self-Help Center and Family Law Facilitator's Office sits at the same Hayward Hall of Justice location. Staff there help self-represented parents figure out which forms they need, including Form FL-150, and explain the general court process, and they can refer parents to ACDCSS for custody and support matters, though they cannot give legal advice tailored to an individual case.

• Alameda County Department of Child Support Services
• Alameda County Superior Court, Family Law Division
• Family Law Self-Help Center
• Family Law E-Filing

Local details reviewed July 2026. Offices and locations can change, so confirm with the official sites above before you file.

Alameda County Child Support FAQs