Vendor Information


Welcome! On behalf of the City of Newark we look forward to serving you. Please review all sections of this page carefully. In order to conduct business with the City of Newark, you must click here to register as a vendor in our Vendor Self Service (VSS) system. If you are an existing vendor, click here to create a profile in our VSS system, which allows you to view key information and documents of your business transactions (purchase orders, invoices, and payments) with the City. 

Alternatively, you may email a W-9 and ACH information to to enroll in the vendor system. 

Below you will find important information regarding invoice processing and information regarding our ACH Policy.

Terms & Conditions

The terms and conditions for all City of Newark purchases can be found at Vendors are expected to understand the City’s terms and conditions prior to issuing quotations for good and/or services.

Invoice Processing Information


All invoices should be e-mailed to Please make sure your company’s name appears in the subject line of the email. The invoice attachment file name should be the purchase order number and invoice number; if you do not have a purchase order number then the file name should be the company’s name and invoice number. If you email us your invoice, please do not mail or fax us an additional hard copy.

 Vendors that are unable to email their invoices should mail them to the following billing address:

  •  City of Newark
  •  Attention: Purchasing
  •  220 South Main St.
  •  Newark, DE 19711

Required Information

Please reference our purchase order number on your invoice. The City of Newark’s purchase order numbers are 8 digits long and contain only numerical characters. Failure to reference our purchase order number may delay payment of your invoice.

Electronic Payments

The city is currently implementing payments by ACH and requires all vendors to be set up for electronic payments. Please fill out the ACH enrollment form on this page and return it by email. If you are unable to email the completed form, please mail it to the following address:

  • City of Newark
  • Attention: Purchasing
  • 220 South Main St.
  • Newark, DE 19711

Payment Terms

Invoices are paid based on the terms you select when completing the ACH enrollment form. Please note our default terms are Net 30.

Additional Information

Should you have any questions concerning our accounts payable process or any other payable related questions, please do not hesitate to contact accounting department at 302-366-7000. 

Should you have any questions concerning vendor information or purchasing related questions, please do not hesitate to contact our purchasing division at or 302-366-7000.