Mercer Post Offices

Here you will find Mercer, Illinois Post Offices by county. Please select your county of residence and meet the U.S. Postal Service locations in that territory.

In case you need to contact your local post office for help with your mail, you can do so over the phone or in person. By choosing an office from the list below, you will get its phone number, address, GPS location and retail hours, lobby hours, last collection times and bulk mail acceptance hours.

You will also find the services provided by your local post office that you can get assistance with, as well as the answers to the most frequently asked questions from the users of the U.S. Postal Service.

Choose an office from the list below to get the phone number, address, working hours and more.