CERTIFIED MAIL · July 2, 2026Can You Send Certified Mail to a PO Box?Yes—USPS delivers Certified Mail to PO boxes. Learn how pickup and signatures work, which records to keep, and what to do if the letter is unclaimed.
FIRST-CLASS MAIL · December 14, 2025Can You Track First-Class Mail? Know Your OptionsA regular First-Class letter has no tracking number. Here's how to get one with Certified Mail or Priority Mail, how to add a signature, and what each costs.
FIRST-CLASS MAIL · December 8, 2025First-Class Mail Delivery Time: How Long a Letter TakesUSPS delivers First-Class Mail in 1–5 days. Get the expected delivery day for your two ZIP codes, learn how USPS counts the days, and plan a letter that has a deadline.
