Some of Arizona’s post offices will be closed. One includes the last mule-train post in Supai at the bottom of the Grand Canyon said the Arizona Daily Sun.

Nationwide, the financially troubled Postal Service announced that it will study 3,653 local offices, branches and stations for possible closure. The post office operates 31,871 retail outlets across the country, down from 38,000 a decade ago.

Including such sites and automated postal kiosks, postal services are available at nearly 100,000 locations nationwide, the agency says.

The post office announced in January it was reviewing 1,400 offices for possible closure. So far, 280 have been closed and 200 have finished the review process and will remain open.