More information from O*NET OnLine:

Postal Service Mail Carriers - 43-5052.00

O*NET-SOC Description

Sort and deliver mail for the United States Postal Service (USPS). Deliver mail on established route by vehicle or on foot. Includes postal service mail carriers employed by USPS contractors.

Sample of Reported Job Titles

City Carrier
City Carrier Assistant (CCA)
City Letter Carrier
City Mail Carrier
Letter Carrier

Mail Carrier
Rural Carrier
Rural Carrier Associate (RCA)
Rural Mail Carrier
Rural Route Carrier

SOC Occupation Groups

43-0000	Office and Administrative Support Occupations
43-5000	Material Recording, Scheduling, Dispatching, and Distributing Workers
43-5050	Postal Service Workers
43-5052.00	Postal Service Mail Carriers

Related Occupations

11-9131.00	Postmasters and Mail Superintendents
43-5011.00	Cargo and Freight Agents Bright Outlook
43-5011.01	Freight Forwarders
43-5021.00	Couriers and Messengers
43-5032.00	Dispatchers, Except Police, Fire, and Ambulance
43-5051.00	Postal Service Clerks
43-5053.00	Postal Service Mail Sorters, Processors, and Processing Machine Operators
43-5071.00	Shipping, Receiving, and Inventory Clerks
43-9051.00	Mail Clerks and Mail Machine Operators, Except Postal Service
53-3033.00	Light Truck Drivers

Tasks

Answer customers' questions about postal services and regulations.
Bundle mail in preparation for delivery or transportation to relay boxes.
Complete forms that notify publishers of address changes.
Deliver mail to residences and business establishments along specified routes by walking or driving, using a combination of satchels, carts, cars, and small trucks.
Hold mail for customers who are away from delivery locations.
Leave notices telling patrons where to collect mail that could not be delivered.
Maintain accurate records of deliveries.
Meet schedules for the collection and return of mail.
Obtain signed receipts for registered, certified, and insured mail, collect associated charges, and complete any necessary paperwork.
Provide customers with change of address cards and other forms.
Record address changes and redirect mail for those addresses.
Register, certify, and insure parcels and letters.
Report any unusual circumstances concerning mail delivery, including the condition of street letter boxes.
Return incorrectly addressed mail to senders.
Return to the post office with mail collected from homes, businesses, and public mailboxes.
Scan labels on letters or parcels to confirm receipt.
Sell stamps and money orders.
Sign for cash-on-delivery and registered mail before leaving the post office.
Sort mail for delivery, arranging it in delivery sequence.
Travel to post offices to pick up the mail for routes or pick up mail from postal relay boxes.
Turn in money and receipts collected along mail routes.