Fax Joaquin Castro
Texas · District 20 D — U.S. Representative
House office fax number
(202) 225-1915
The form below is prefilled with this number and a cover page addressed to “The Honorable Joaquin Castro” — you just attach your document. $0.50/page, no account.
How to address your fax to Joaquin Castro
By convention, correspondence to a U.S. representative is addressed to “The Honorable Joaquin Castro”, with the salutation “Dear Representative Castro”. Postal mail and courier deliveries reach the office at: The Honorable Joaquin Castro, U.S. House of Representatives, Washington, DC 20515.
What to include
- One issue per fax. Reference a specific bill number or regulation if you have one — offices sort mail by topic, and a single clear ask gets tallied accurately.
- Your name and mailing address. House offices prioritize constituents; an address in Texas (ideally within District 20) signals your position should be counted as a Texas voter.
- Keep it to one page. A short, specific message — what you want the representative to do, and why it matters to you — is read fully and logged.
Why fax still works for House offices
Security screening delays physical mail to Capitol Hill by weeks, and email forms bury individual messages. Fax arrives the same day with a timestamped transmission record, which is why offices — and the advocacy groups that track them — still publish fax numbers. Sending online, you get the delivery confirmation without a fax machine.
Frequently asked questions
What is Joaquin Castro's fax number?
Joaquin Castro's published House office fax number is (202) 225-1915. Send a fax to Representative Castro online for $0.50 per page — no account or fax machine required.
How do I address a fax to Joaquin Castro?
Address the cover page to “The Honorable Joaquin Castro” and open the message with “Dear Representative Castro”. Including your full name and mailing address helps the office verify you are a constituent of Texas's District 20.
Does Joaquin Castro actually read faxes?
House offices log every fax that arrives and count positions on issues, even when replies come by mail or email. Faxes are timestamped, which makes them useful as a written record of where you stood and when.
Also represents Texas
Sen. John Cornyn (R) — not accepting faxes
Also represents Texas
Sen. Ted Cruz (R) — not accepting faxes
Writing a cover page?
8 fax cover letter examples for every use case
Fax number data collected August 2026 and cross-checked against house.gov. See the full House fax directory.