Send envelopes and lightweight packages in 1-3 business days.
https://www.usps.com/ship/first-class-mail.htm
Shipping Providers
Get access to data on 49,786 websites that are USPS First Class Customers. We know of 19,893 live websites using USPS First Class and an additional 29,893 sites that used USPS First Class historically and 18,129 websites in the United States.
Get a list of 49,786 websites using USPS First Class which includes location information, hosting data, contact details, 19,893 currently live websites and an additional 26,165 domains that redirect to sites in this list. 29,893 sites that used this technology previouslyand 18,129 websites in the United States currently using USPS First Class.
Countries
Financial
Group
Region