Are all letters first class mail

No, not all letters are considered First-Class Mail. In the United States, the United States Postal Service (USPS) has different classes of mail with varying levels of service and pricing. Here's a breakdown:

  1. First-Class Mail: This is the most common and widely used class of mail. It includes letters, postcards, and lightweight packages weighing up to 13 ounces. First-Class Mail is typically delivered within 1-3 business days, and the cost is based on the weight and size of the item.
  2. Priority Mail: This class of mail is faster than First-Class Mail, with delivery typically within 1-2 business days. Priority Mail is ideal for packages that need to arrive quickly, such as gifts or important documents. The cost is higher than First-Class Mail, but the service is faster.
  3. Priority Mail Express: This is the fastest class of mail, with overnight delivery guaranteed. Priority Mail Express is ideal for time-sensitive items, such as urgent documents or packages that need to arrive the next day. The cost is the highest of the three classes.
  4. Standard Mail: This class of mail is used for bulk mailings, such as catalogs, newsletters, and advertisements. Standard Mail is typically delivered within 3-10 business days, and the cost is lower than First-Class Mail.
  5. Periodicals: This class of mail is used for publications, such as newspapers, magazines, and journals. Periodicals are typically delivered within 3-10 business days, and the cost is lower than First-Class Mail.

In summary, not all letters are First-Class Mail. While First-Class Mail is the most common class of mail, there are other classes of mail with varying levels of service and pricing.