The Maintenance Division is comprised of approximately 40,000 employees, covering all pay grades — from 1 to 11— and more than 50 different position descriptions. It covers a wide variety of duties, including general office work, cleaning, mechanical, electronic, carpenter, painter, electrician and plumber. Staffing is divided into five general areas: Building Services (custodial); Field Maintenance; Administrative; Building Equipment (physical building and environment); and Mechanized (all postal equipment).

There are fewer than 600 part-time regulars, with the remainder of the employees being full-time regulars.