The Customer Registration ID is a numeric identification number (up to 15 digits) which is used to uniquely identify a USPS customer at a location. Essentially it identifies the various physical locations of the same customers. For example, if a USPS customer has five different mailing facilities, they will be assigned five CRID’s, one for each physical location. The CRID’s are used in the electronic files and documents for IM, but are NOT included in the IM barcode.
MID’s and CRID’s may be applied for using the Business Customer Gateway. Mailers should allow for 2 to 5 days for this application process. There are some situations which may require that these applications be made manually using hard copy forms; if applicable this will be specified on the Business Customer Gateway.