Where do l find my UPS Shipper number? ExtensionWorks September 07, 2015 17:00 Updated Follow Log into UPS. Go to: My UPS / Account Summary You will find your shipper number there: Number Related articles UPS Account Information and Negotiated Rates Where do I find my UPS license key or Access Key? USPS Customer User ID Where do l request a Fastway API key? Published vr's Negotiated rates Comments 0 comments Article is closed for comments.