USPS Headquarters Fax Number: Complete Guide

By David Thompson · Published July 27, 2025 · Updated March 26, 2026 · 6 min read

The USPS headquarters fax number you need depends on why you're contacting them. USPS doesn't publish one universal public-facing fax line — instead, each major department has its own dedicated fax. Using the wrong number means your document lands in the wrong department, or doesn't arrive at all.

This guide lists every verified USPS department fax number, explains what each one is for, and shows you the fastest way to send your fax from any phone or computer.

Quick Reference: USPS Fax Numbers by Department

Use this table to find the right fax number for your need.

USPS FOIA Fax Number — Records Requests

Fax: (202) 268-5353

The most commonly needed USPS headquarters fax number is for Freedom of Information Act (FOIA) requests. If you want to obtain public records held by USPS — mail records, operational data, contracts, or other agency documents — you send your written request here.

Room 1P830, 475 L'Enfant Plaza SW, Washington, DC 20260-1101

Your FOIA fax must include:

• Your full name, mailing address, and daytime phone number
• A clear description of the records you're requesting
• A timeframe or date range for the records (if applicable)
• A fee agreement statement (e.g., "I am willing to pay up to $25 in duplication fees")
• Your signature

The USPS Records Office phone line at (202) 268-2608 can confirm receipt and answer process questions.

Postal Inspection Service FOIA requests use a separate fax: (202) 268-4538, directed to Room 3301 at the same L'Enfant Plaza address.

USPS HR Fax Number — Employee and Benefits Paperwork

Fax: (336) 662-4070

The USPS Human Resources Shared Services Center (HRSSC) in Greensboro, NC handles all employee-facing HR matters via fax. Use this number for:

• Benefits enrollment or changes (health, dental, life insurance)
• Compensation adjustments and payroll paperwork
• Employment verification requests
• Leave paperwork and FMLA documentation
• Retirement-related forms

The HRSSC mailing address is: PO Box 970400, Greensboro, NC 27497-0400. Their phone line is 1-877-477-3273, available during business hours. Allow 7–10 business days for processing after fax submission.

USPS Mail Fraud Fax — Reporting to the Postal Inspection Service

Fax: (626) 405-1207

If you've encountered mail fraud, mail theft, or postal crimes, the U.S. Postal Inspection Service Criminal Investigations Service Center accepts fax reports at this number.

Their mailing address is 433 W. Harrison Street, Room 3255, Chicago, IL 60699-3255. Phone: 1-877-876-2455.

USPS also accepts online fraud reports at uspis.gov/report — the online route is often faster than fax for initial reports.

USPS Licensing & Public Affairs Fax

Fax: (202) 268-5685

The USPS Licensing Group handles matters related to the use of USPS intellectual property — trademarks, images of postal vehicles, official logos, and similar assets. Use this fax for:

• Licensing requests for USPS imagery or branding
• Public Affairs coordination
• Media and publication inquiries

Phone: (202) 268-2143 | Room 10523, 475 L'Enfant Plaza SW, Washington, DC 20260-3100.

USPS National Customer Support Center Fax

Fax: (901) 767-8853

The National Customer Support Center in Memphis, TN handles escalated business mail and customer support requests. Use this line for business account matters that require fax submission.

Address: 225 N. Humphreys Blvd, Suite 501, Memphis, TN 38188-1001. Phone: 800-238-3150.

When Fax Is — and Isn't — the Right Channel

Not every USPS contact requires a fax. Here's how to choose the right channel:

How to Fax USPS Headquarters from Your Phone

The fastest way to send a fax to any USPS department is from your phone using the mFax app — no fax machine, no office visit required.

Step 1: Prepare your document

Make sure your document is in PDF format. Multi-page documents should be combined into a single PDF. If you're converting a Word file or image, use the free Document Converter at mFax.to.

Step 2: Add a professional cover sheet

Every fax to a government agency should include a cover sheet. Include:

• Your full name and return fax number (or phone number)
• The recipient department name (e.g., "USPS Records Office — FOIA Request")
• Date, total page count (including cover sheet)
• Brief subject line (e.g., "FOIA Request — Mail Processing Records 2024")

Use the free mFax Cover Sheet Generator at mFax.to.

Step 3: Open the mFax app and send

1. Open the mFax app on iOS or Android (or go to mFax.to in any browser)
2. Tap Send Fax
3. Enter the USPS department fax number (e.g., 202-268-5353 for FOIA)
4. Upload your PDF and cover sheet
5. Tap Send — you'll receive a real-time delivery status and a confirmation receipt

The confirmation receipt is especially important when faxing FOIA requests: it proves you submitted on a specific date, which matters for response-time tracking under the Freedom of Information Act.

Tips for Faxing a Government Agency

Faxing a large government organization like USPS is different from faxing a small business. Follow these best practices:

• Use the right department fax — a general number rarely routes to the right team. Match the fax number to your specific purpose using the table at the top of this guide.
• Always include a complete cover sheet — list the department name, room number, your full contact information, and the purpose of the fax. Government agencies use cover sheet details to route documents internally.
• Send during business hours — government fax lines are sometimes only staffed and monitored during regular hours (Mon–Fri, 8 AM–5 PM ET for most USPS offices).
• Keep your confirmation receipt — federal agencies are subject to response deadlines under FOIA and other statutes. Your fax confirmation serves as the official date of submission.
• Follow up by phone if urgent — for time-sensitive matters, call the department phone number 1–2 business days after faxing to confirm receipt.
• Use black-and-white, high-contrast scans — government fax lines often use older equipment. High-contrast black-and-white PDFs transmit more reliably than color or grayscale documents.

USPS Contact Numbers — Full Reference

Related Guides

Looking for other government or agency fax guides?

• How to Fax to the IRS — IRS fax numbers and submission tips
• How to Fax Form SS-4 to the IRS — EIN application fax guide
• Fax Cover Sheet Templates — professional templates for government faxes
• Does USPS Offer Fax Services? — USPS retail fax availability
• How to Fax from iPhone — send any fax from your phone

Send Your Fax to USPS Now

Find the right department fax number in the table above, prepare your document as a PDF, and send it in minutes using mFax.to or the mFax mobile app. You'll get a delivery confirmation receipt — the date-stamped proof of submission that matters when dealing with federal agencies.

For FOIA requests: Fax (202) 268-5353 — USPS Records Office, Room 1P830. For HR paperwork: Fax (336) 662-4070 — USPS HRSSC, Greensboro, NC. For mail fraud reports: Fax (626) 405-1207 — Postal Inspection Service.

No fax machine needed. Try mFax.to — fax from your phone in under 2 minutes.