Fax Directory FaxNumber Needs Review

Contra Costa County Office Fax

Contra Costa County • Office • Martinez, Contra Costa County, California
Official Fax Number
(925) 335-3636
Send Fax Online
Agency
Contra Costa County
Section
Department of Child Support Services
Department
Department of Child Support Services
Office
Office
Location
Martinez, Contra Costa County, California
Last Checked
June 3, 2026

Verification & trust

Status Needs Review
Last verified June 3, 2026
Confidence 0.95

What this fax number is for

Office

Before you fax

  • Confirm the form number, case type, or filing purpose before sending.
  • Include any required notice number, claim number, or reference ID.
  • Review the source page for updated fax instructions before sending sensitive documents.
  • Do not send duplicate submissions unless instructed.

Need to send this fax now?

Upload your document and send it online without a fax machine.

Send Fax Online

Source and verification

Source Evidence
Added June 1, 2026

Fax ( 925) 335-3636

View Source Confidence: 0.95
Source Evidence
Added June 1, 2026

Fax ( 925) 335-3636

View Source Confidence: 0.93
Quick facts
Type FaxNumber
Agency Contra Costa County
Fax Number (925) 335-3636
About this listing
This listing is meant to help users confirm the correct fax destination before sending documents.
Needs Review Checked Jun 3, 2026