If you wish to be a vendor with the City of Union City, please complete a W-9 (Request for Taxpayer Identification Number and Certification) [PDF] and return to the City by mail or fax to the following:
34009 Alvarado-Niles Road
Union City, California 94587
Telephone (510) 675-5431
Fax (510) 487-9361
If you should have any questions about any other issues, please also feel free to contact the number above.