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Postal Encyclopedia

Saturation

Updated 2026-07-24

Route coverage level

Mail Classes & Rates

The deepest carrier-route price level, based on covering the great majority of a route's delivery addresses rather than on a flat piece count.

Definition reviewed 2026-07-24. Plavidian reference, written from the USPS Domestic Mail Manual. Final mail classification, postage, and preparation are confirmed after list processing and production review.

Related terms in Mail Classes & Rates

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