What the USPS Post Office does

The United States Postal Service (USPS) is a federal agency that delivers mail and packages to every address in the country, including rural areas where private carriers often do not go. It operates about 31,000 post offices nationwide, each one a physical location where you can buy stamps, mail packages, and access certain services. USPS is not a private company — it is run by the federal government and does not receive tax dollars for day-to-day operations, instead funding itself through postage sales and service fees.

A post office is where mail gets sorted, weighed, and sent on its way. When you drop a letter in a mailbox or hand it to a clerk, it enters the USPS network. From there it moves through regional sorting facilities and delivery routes until it reaches the recipient's mailbox. The same building also sells postage products, accepts packages for shipping, and offers services like notarization or passport photo processing at some locations.

Key Takeaways

  • USPS operates as a federal agency and delivers to every U.S. address, including places private carriers skip.
  • You can buy stamps, mail packages, and use services like certified mail or money orders at any post office.
  • Mail delivery speed depends on the service you choose: First-Class Mail takes 1–3 business days, Priority Mail Express is overnight, and standard mail can take 3–10 days.
  • Post office hours and services vary by location; smaller offices may close on weekends or offer fewer services than larger branches.
  • You can track packages, buy postage online, and schedule pickups without visiting a post office.

How to find your local post office and its hours

The USPS website has a post office locator tool where you enter your ZIP code and see all nearby locations, their hours, and which services each one offers. Not every post office is identical — a small rural office may only sell stamps and accept packages, while a larger branch in a city offers notarization, passport photos, and money orders. Hours vary widely: some close at 5 p.m. on weekdays and noon on Saturday, while others stay open later or close on Sunday entirely.

You can also call your local post office directly to confirm hours before you go, especially if you need a specific service. Many post offices are inside grocery stores or pharmacies rather than in standalone buildings, so the locator tool will show you the exact address and whether it is a full-service branch or a smaller contract location.

Mailing letters and packages through USPS

USPS offers several ways to send mail, each with different speeds and costs. First-Class Mail is the standard option for letters and small packages under 13 ounces; it typically arrives in 1–3 business days and costs less than faster services. Priority Mail is faster (1–3 business days for most destinations) and includes tracking at no extra charge. Priority Mail Express is the fastest option, guaranteeing overnight or 2-day delivery depending on destination, and also includes tracking.

For heavier packages or items going far, Ground Advantage (formerly Parcel Select) is slower but cheaper, typically taking 2–8 business days. You can drop off packages at any post office, or schedule a free pickup from your home if you have a package ready. You do not have to go to the post office to buy postage — you can print labels at home using USPS.com or third-party services, then drop the package in a mailbox or at the post office.

Special mailing services and what they cost

Beyond standard mail, USPS offers services that add protection or proof of delivery. Certified Mail provides a receipt showing when your letter was delivered and to whom; it costs extra but is commonly used for important documents. Registered Mail offers even more security with tracking at each step and insurance against loss or damage, though it is more expensive and slower. Return Receipt lets you request a signed confirmation that the recipient got your mail.

Insurance is available on packages up to a certain value; USPS covers loss or damage if you purchase it at the time of mailing. Costs depend on the declared value of the package. Money orders can be purchased at any post office for a small fee and are a way to send money safely through the mail. Notary services and passport photo services are available at many (but not all) post offices; call ahead to confirm your location offers them.

How USPS mail delivery works at your address

Mail is delivered to your address by a postal carrier who follows a set route each day. If you have a mailbox at your home, the carrier puts mail directly in it. If you live in an apartment building, mail may go to a cluster mailbox in the lobby or to individual boxes. In some cases, mail is held at the post office for you to pick up if delivery is not possible.

Delivery typically happens once per day, six days a week (Monday through Saturday); Sunday delivery is available in some areas for Priority Mail Express only. If you are away, you can request that mail be held at the post office until you return, or you can have a trusted person collect it. You can also use USPS Informed Delivery, a free service that shows you images of incoming mail and packages before they arrive, and lets you manage delivery for specific pieces.

Tracking packages and managing deliveries

Most USPS services include tracking at no extra cost. When you mail a package, you receive a tracking number that you can enter on USPS.com to see where it is in the delivery network. Tracking updates show when the package leaves a facility, arrives at the next one, and is out for delivery. You can also sign up for text or email alerts when a package is on its way.

If a package arrives while you are not home, the carrier leaves a notice in your mailbox. You can then pick it up at the post office, request redelivery, or authorize the carrier to leave it in a safe place. Through Informed Delivery, you can tell USPS in advance whether you want a package left at your door or held for pickup, and you can reschedule delivery dates if needed.

What you cannot do at a post office

USPS handles mail and packages, but there are services it does not provide. You cannot open a bank account, cash checks, or get a loan at a post office. You cannot purchase shipping insurance from other carriers (like UPS or FedEx) there, though some post offices do accept packages for those carriers. You cannot renew a driver's license or vehicle registration, though some post offices do offer passport services.

If you need to ship something internationally, USPS does offer that service, but there are restrictions on what can be mailed to certain countries and what forms you must complete. Hazardous materials, live animals, and certain other items cannot be shipped through USPS at all. The post office staff can tell you whether your item is shippable and what paperwork is required.

Frequently Asked Questions

How much does it cost to mail a letter?

As of 2024, a First-Class Mail stamp for a standard letter costs 68 cents. Prices change periodically, so check USPS.com or ask at your post office for the current rate. You can buy individual stamps, books of stamps, or postage online.

What happens if I put the wrong address on a package?

If the address is incomplete or incorrect, the post office will try to deliver it anyway. If delivery fails, the package is returned to the sender. If you catch the mistake before it ships, you can go to the post office and correct the label. After it ships, you can contact USPS to request a mail forwarding correction, though this does not always work.

Can I get my mail forwarded if I move?

Yes. You can file a change of address form at your local post office or online at USPS.com. The service typically costs a small fee and lasts for a set period (usually 12 months). Mail sent to your old address will be forwarded to your new one during that time.

What is the difference between Priority Mail and Priority Mail Express?

Priority Mail typically takes 1–3 business days and costs less. Priority Mail Express guarantees overnight or 2-day delivery depending on destination and costs more. Both include tracking. Choose Priority Mail for regular shipments and Express for time-sensitive items.

Can I schedule a package pickup from my home?

Yes, USPS offers free package pickup if you have a package ready to ship. You can request a pickup online at USPS.com or by calling your local post office. The carrier will collect it during their regular delivery route the next business day.