USPS Glossary

First-Class Mail

USPS premium mail class with the fastest delivery and the highest rates.

Full definition

First-Class Mail is the standard premium tier: 1 to 5 business days delivery, return-to-sender if undeliverable, and free forwarding for moves within 12 months. Used for targeted-list direct mail when speed and accountability matter. Postage runs about $0.40 to $0.55 per piece in 2026 depending on weight and dimensions.

Related terms

Standard Mail (Marketing Mail) →
USPS bulk class for promotional mail; cheaper than first-class, slower delivery.

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