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Postal Encyclopedia

High Density Plus

HD Plus

Mail Classes & RatesUpdated 2026-07-24

A deeper carrier-route price level than High Density, requiring at least 300 pieces on a single carrier route.

Definition reviewed 2026-07-24. This is a plain-English Plavidian reference; for USPS terms, the Domestic Mail Manual is the authority. For your own job, the final mail class, postage, and preparation are confirmed after list processing and production review.

Related terms in Mail Classes & Rates

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