Institution fax directory

Looking for an official fax line? Search verified US destinations—IRS elections and EIN filings, Equifax / Experian / TransUnion credit disputes, USCIS immigration notices, SSA benefits, healthcare prior authorization, and financial institutions. Each guide explains what to include, then opens RonFax with the number ready to send.

Always confirm the fax number on your letter or the agency's official website before transmitting. Numbers can change by form, campus, or plan.

Equifax — Credit Dispute
Atlanta, GA · Credit bureaus
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Experian — Credit Dispute
Allen, TX · Credit bureaus
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TransUnion — Credit Dispute
Chicago, IL · Credit bureaus
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Better Business Bureau (National)
Arlington, VA · Finance & business
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Dun & Bradstreet — D-U-N-S
Short Hills, NJ · Finance & business
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SEC — EDGAR / Filings Support
Washington, DC · Finance & business
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Capital One — Disputes & Correspondence
McLean, VA · Financial services
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Chase Card Services
Wilmington, DE · Financial services
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F&G Life — Policyholder Service
Des Moines, IA · Financial services
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Gerber Life Insurance
Fremont, MI · Financial services
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HCA Healthcare — 401(k) / Voya
Nashville, TN · Financial services
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HealthEquity — HSA Transfer
Draper, UT · Financial services
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Merrill Edge — Document Processing
Tampa, FL · Financial services
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Arizona ALTCS — Application Fax
Phoenix, AZ · Government
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Iowa Secretary of State — Business Services
Des Moines, IA · Government
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IRS — Forms 2848 / 8821 (Power of Attorney)
Washington, DC · Government
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IRS — Missing Refund (Form 3911)
Washington, DC · Government
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U.S. Passport Agency — Expedited
Washington, DC · Government
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USCIS (Immigration Filings)
Arlington, VA · Government
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California FTB — Filing Enforcement
Sacramento, CA · Government & tax
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IRS — Form 2553 (S-Corp Election)
Washington, DC · Government & tax
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IRS — Form SS-4 (Apply for EIN)
Washington, DC · Government & tax
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IRS — Kansas City MeF / SP Rejects
Kansas City, MO · Government & tax
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Massachusetts DOR — Court Order / Child Support
Boston, MA · Government & tax
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NYS Department of Labor — UI Claimant Fax
Albany, NY · Government & tax
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NYS Department of Labor — UI Collections
Albany, NY · Government & tax
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Social Security Administration
Woodlawn, MD · Government & tax
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180 Medical
Oklahoma City, OK · Healthcare
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Cigna — Medical Review
Bloomfield, CT · Healthcare
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Humana — Pharmacy
Louisville, KY · Healthcare
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Sample Regional Medical Group
Austin, TX · Healthcare
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UArk Pat Walker — Medical Records
Fayetteville, AR · Healthcare
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UnitedHealthcare — Prior Authorization
Minnetonka, MN · Healthcare
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VA — Healthcare Benefits
Washington, DC · Healthcare
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Aetna — Prior Authorization
Hartford, CT · Healthcare & prior auth
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Blue Cross Blue Shield — Prior Authorization
Chicago, IL · Healthcare & prior auth
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Cigna — Prior Authorization
Bloomfield, CT · Healthcare & prior auth
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Sunflower Health Plan — Behavioral Health UM
Topeka, KS · Healthcare & prior auth
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Atlanta Gas Light — Customer Care
Atlanta, GA · Utilities
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Why use a fax destination guide?

Many agencies still require fax for disputes, elections, and follow-ups—email alone often does not count. RonFax helps you send from any browser: upload a PDF, confirm the number from your official paperwork, pay once, and track delivery. Browse the full directory above or jump to guides for IRS Form 2553, Equifax credit disputes, California FTB Filing Enforcement, Atlanta Gas Light, and step-by-step blog how-tos.