The USPS (United States Postal Service) has an online locator tool that tells you where the nearest post office is. To use the tool, you need to provide an address or a zip code, and you need to select a mileage radius.
The USPS locator tool searches for post offices, approved postal providers, self-service kiosks, collection boxes, and other postal services like passport services. You can look for facilities that are within a 1-mile to 100-mile radius of any location. If you cannot access the online tool, simply ask your postal carrier where to find the local branch — these professionals roam the streets six days a week.