Child Support in Colusa County, California

Colusa County runs court business in two buildings a few blocks apart in the city of Colusa. The main courthouse at 547 Market St handles Department 1. A separate annex at 532 Oak St houses Department 2 and the court executive office. The court's website does not say which building handles every family law filing, so call (530) 458-5149 before you choose where to park.

Child support enforcement in Colusa goes through a three-county office, the Colusa, Sutter, and Yolo Regional Child Support Agency. Its Colusa office is at 217 Ninth Street, Suite A. That is a different regional setup than the courthouse's own county. Keep that in mind if you expect all county services to come from one place.

California uses one child support formula statewide, Family Code section 4055. It looks at both parents' net income and how parenting time is divided. Colusa does not add a local rule to that calculation. Use the free calculator at childsupport.ca.gov/guideline-calculator to get a rough idea of where your case may land before you go to either courthouse building. Then file a Request for Order (FL-300) with an Income and Expense Declaration (FL-150) yourself, or ask the regional agency to open a case.

Colusa's online services page lists an e-file link. The vendor and any mandatory e-filing rule for family law have not been confirmed independently, so check with the clerk before you assume you can avoid a paper filing.

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 Colusa 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 Colusa County

Child support in Colusa County is handled through the Superior Court of California, County of Colusa, 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 Colusa County Superior Court (official California Courts finder)

Local notes for Colusa County

Because Colusa uses two courthouse buildings on different streets, the biggest local issue is not the paperwork. It is knowing which door to use. Confirm ahead of time whether your hearing or filing belongs in Department 1 on Market Street or Department 2 on Oak Street. The court does not explain this online for every case type.

The self-help resource at colusa.courts.ca.gov can direct self-represented parents to the right forms. It cannot advise you on how your case should be decided, and exact hours are not posted. The court also does not publish whether a commissioner or judge hears support matters here, so ask when you check in. If your case involves Sutter or Yolo County, the regional agency already covers all three. You likely do not need three separate contacts.

The court executive office is in the Department 2 annex on Oak Street, not the Market Street courthouse. If your question is administrative rather than about a specific filing, try that building first.

Official child support resources in Colusa County

Superior Court of California, County of Colusa (Main Courthouse, Department 1) handles child-support filings, located at 547 Market St, Colusa 95932. Phone: (530) 458-5149. Colusa Superior Court Annex (Department 2) at 532 Oak St. handles Department 2 matters and the court executive office.

E-filing is available. The court's online services page lists an E-File link; confirm the current vendor and any mandatory e-filing rule with the clerk.

Colusa County Self-Help Center / Family Law Facilitator (https://www.colusa.courts.ca.gov/) can help with procedure and paperwork. Helps self-represented parents with forms and procedure; cannot give legal advice for your situation.

• Superior Court of California, County of Colusa (Main Courthouse, Department 1)
• Colusa County Self-Help / Family Law Facilitator
• Colusa, Sutter, and Yolo Regional Child Support Agency
• California Guideline Child Support Calculator
• Form FL-300 Request for Order
• Form FW-001 Request to Waive Court Fees

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

Colusa County Child Support FAQs