Pieces mailed at card rates and pieces mailed at letter rates must meet separate 500-piece minimums. Carrier Route rates limited to 5-digit ZIP Codes identified in the City State File. Carrier route information updated using CASS-certified process within 90 days before mailing. For additional marking standards for carrier route pieces, see M014 . See below for tray label Line 2 information.
Additional standards apply to mailings of nonidentical-weight pieces.
See Quick Service Guide 900 . For Line 1, use L801 for destination facility. Use an optional endorsement line or carrier route information line. Card-size pieces must be banded. For Line 1, use city, state, and 5-digit ZIP Code on mail.