Perform any combination of tasks in a post office, such as receive letters and parcels; sell postage and revenue stamps, postal cards, and stamped envelopes; fill out and sell money orders; place mail in pigeon holes of mail rack or in bags according to State, address, or other scheme; and examine mail for correct postage.

Other names for Postal Service Clerks: Accountable Clerk, Assistant, Bulk Mail Clerk, Bulk Mail Entry Unit Technician (BMEU Tech), Bulk Mail Technician, Business Mail Entry Clerk, Clerk, Counter Clerk, Delivery Clerk, Distribution Clerk, Dock Clerk, Mail Agent, Mail Caller, Mail Clerk, Mail Handler, Mail Order Clerk, Mailing Clerk, Mailroom Clerk, Money Order Clerk, Nixie Clerk, Parcel Post Clerk, Part Time Flexible Clerk (PTF Clerk), Post Office Clerk, Postal Clerk, Postal Retail Clerk, Postal Service Clerk, Postal Worker, Sales and Distribution Clerk, Sales and Service Associate (SSA), Sales Associate, Special Delivery Clerk, Stamp Clerk, Window Clerk, Window/Distribution Clerk,

• Complete forms regarding changes of address, or theft or loss of mail, or for special services such as registered or priority mail.
• Provide assistance to the public in complying with federal regulations of Postal Service and other federal agencies.
• Sort incoming and outgoing mail, according to type and destination, by hand or by operating electronic mail-sorting and scanning devices.
• Cash money orders.
• Rent post office boxes to customers.
• Put undelivered parcels away, retrieve them when customers come to claim them, and complete any related documentation.
• Provide customers with assistance in filing claims for mail theft, or lost or damaged mail.
• Respond to complaints regarding mail theft, delivery problems, and lost or damaged mail, filling out forms and making appropriate referrals for investigation.
• Receive letters and parcels, and place mail into bags.
• Feed mail into postage canceling devices or hand stamp mail to cancel postage.
• Transport mail from one work station to another.
• Set postage meters, and calibrate them to ensure correct operation.
• Post announcements or government information on public bulletin boards.
• Keep money drawers in order, and record and balance daily transactions.
• Weigh letters and parcels; compute mailing costs based on type, weight, and destination; and affix correct postage.
• Obtain signatures from recipients of registered or special delivery mail.
• Register, certify, and insure letters and parcels.
• Sell and collect payment for products such as stamps, prepaid mail envelopes, and money orders.
• Check mail in order to ensure correct postage and that packages and letters are in proper condition for mailing.
• Answer questions regarding mail regulations and procedures, postage rates, and post office boxes.