Last Updated: May 2026
Colorado is represented in the U.S. Senate by two senators. Use the information below to contact them directly by phone, online contact form, or written correspondence.
Colorado U.S. Senators
Michael Bennet (D)
Party: Democrat
Term Expires: January 3, 2029
D.C. Phone: (202) 224-5852
Contact Form: bennet.senate.gov/public/index.cfm/contact
Committees: Finance; Agriculture, Nutrition, and Forestry; Health, Education, Labor, and Pensions; Intelligence
John Hickenlooper (D)
Party: Democrat
Term Expires: January 3, 2027
D.C. Phone: (202) 224-5941
Contact Form: hickenlooper.senate.gov/contact/
Committees: View Senator Hickenlooper’s committee assignments
How to Contact Your Colorado Senator
1. Call the Washington, D.C. Office
Calling is the most effective way to reach your senator’s office. Senate staff track constituent calls and report volume to the senator daily. You do not need to leave a detailed message — a brief statement of your name, city, and position on an issue is sufficient.
Michael Bennet: (202) 224-5852
John Hickenlooper: (202) 224-5941
2. Use the Online Contact Form
Both senators accept constituent messages through their official Senate contact forms. You will need to provide your name, address, and email. Messages sent through official forms are logged and reviewed by staff.
Michael Bennet: www.bennet.senate.gov/public/index.cfm/contact
John Hickenlooper: www.hickenlooper.senate.gov/contact
3. Write a Letter
Written letters sent to the Washington, D.C. office are read and logged. Address your letter to: The Honorable [Senator’s Name], United States Senate, Washington, D.C. 20510.
4. Visit a State Office
Both senators maintain district offices throughout Colorado. In-person visits and meetings with district staff are an effective way to discuss local issues. Check each senator’s official website for current office locations and hours.
Sample Message Template
Use this template as a starting point when contacting your senator by phone or online form. Personalize it with your name, city, and the specific issue you are writing about.
Dear Senator [Last Name], My name is [Your Name] and I am a resident of [Your City], Colorado. I am writing to ask for your support on [issue]. [Briefly explain why this issue matters to you and your community — 2 to 3 sentences.] I respectfully ask that you [specific action: vote for/against, co-sponsor, support, oppose] [bill or policy name if applicable]. Thank you for your time and your service to Colorado. Sincerely, [Your Name] [Your City, Colorado] [Your Email]
Frequently Asked Questions
Who are Colorado’s current U.S. senators?
Colorado’s current U.S. senators are Michael Bennet and John Hickenlooper.
How do I contact my Colorado senator?
You can contact your Colorado senator by calling their Washington, D.C. office, submitting a message through their official contact form, or writing a letter to their Senate office. Phone calls are generally the most effective method for urgent issues.
What is the phone number for Michael Bennet?
Senator Michael Bennet’s Washington, D.C. office phone number is (202) 224-5852.
What is the phone number for John Hickenlooper?
Senator John Hickenlooper’s Washington, D.C. office phone number is (202) 224-5941.
When does Michael Bennet’s term expire?
Senator Michael Bennet’s current term expires January 3, 2029.
When does John Hickenlooper’s term expire?
Senator John Hickenlooper’s current term expires January 3, 2027.
Does my senator have to respond to my message?
Senators are not legally required to respond to every constituent message, but most offices do send a response — often within several weeks. Phone calls typically receive a faster acknowledgment than written messages.
Related Tools
Use these tools to find more information about your elected officials and federal benefits: