First Class Mail and Priority Mail serve different purposes at USPS. Here's a clear breakdown to help you choose the right service.
Service Comparison
| Feature | First Class Mail | Priority Mail |
|---|---|---|
| Best For | Letters, postcards, small envelopes | Packages, urgent deliveries |
| Weight Limit | 3.5 oz (letters), 13 oz (flats/parcels) | 70 lbs |
| Delivery Time | 2–5 business days | 1–3 business days |
| Starting Price | $0.73 (letters) | ~$8.00 |
| Tracking | Not for letters; yes for packages | Full tracking |
| Insurance | None for letters | Up to $100 included |
When to Use First Class Mail
First Class Mail is the standard for sending letters, postcards, greeting cards, and lightweight documents. It's the most affordable way to send mail within the US.
When to Use Priority Mail
Priority Mail is designed for packages and urgent documents. It's faster, includes tracking and insurance, and offers flat rate pricing that can save money on heavy items.