USPS Postage Help Center
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Priority Mail®
Learn more about the US Postal Service’s low cost shipping option that delivers packages within 2 – 3 days.
Learn more about Priority Mail.
USPS® Mail Classes and Services
Learn more about USPS Mail Classes and Special Services
USPS Mail Classes
- Critical Mail
- Priority Mail Express®
- Priority Mail Express Flat Rate
- First Class Mail®
- First Class Package Service
- Library Mail
- Media Mail
- Military Mail
- Parcel Select Ground
- Priority Mail®
- Priority Mail Flat Rate
- Regional Rate Boxes
- Standard Post®
USPS Mail Types
USPS Postage Rates
USPS Special Services
- Carrier Pickup
- Certified Mail™
- What is the Cheapest Way to Ship a Package
- What is the Difference Between Standard and Expedited Shipping
- Change of Address
- USPS International Shipping
- USPS International Shipping Rates
- USPS Holidays
- Click-N-Ship
- USPS Tracking™
- Forever Stamps
- Free USPS Shipping Supplies
- Intelligent Mail Barcode
- Package Intercept
- Registered Mail™
- Restricted Delivery
- Return Receipt
- Return Shipping labels
- SCAN Forms
- Signature Confirmation™
- USPS Package Insurance
How To Articles
International Mail
- Customs Forms
- First Class International
- Priority Mail International
- Priority Mail Express International
- International Mail
- International Package Insurance
- International Shipping Discounts
USPS Tools
USPS Pricing
USPS Delivery
Address Cleansing
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Address Cleansing
For Stamps.com customers, addresses are automatically cleansed to match USPS specifications. This can prevent returned mail and improve deliverability.
Address Cleansing Basics
USPS Postage Rates
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USPS Postage Rates
For Stamps.com customers, postage rates are automatically calculated using current rates.
Current Postage Rates
Free USPS Supplies
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Free USPS Supplies
The USPS offers free shipping supplies to send packages through certain classes of mail. Order your free Priority Mail Express or Priority Mail pre-printed boxes, stickers, or forms today.
Order Free USPS Supplies
Shipping Rate Comparison
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Shipping Rate Comparison
Lower your shipping costs. See why USPS shipping rates can be much lower than UPS or FedEx®. Start saving money today!
Compare Shipping Rates
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6 tips for Package Shipping to APOs/FPOs
Six tips for letters and packages being sent to an APO or FPO military base.
Learn more about shipping to APOs/FPOs
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8 Tips to Lower Your Mailing and Shipping Costs
Check out these eight great tips on how to make your mailing and shipping budget go the extra mile.
Great tips to help you save on shipping
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Use Media Mail
Media Mail allows you to send pounds of media for a fraction of the cost, which can save your small business money.
Use Media Mail to save on shipping