Does Colorado require a license number in a real estate agent's email signature?

Rule 6.10 does not require a license number in advertising. A search of the full broker-rules chapter we read for “license number” found no hit.

Does Colorado's real estate advertising rule apply to email?

Rule 1.2 defines Advertising as the promotion, solicitation, or representation of Real Estate Brokerage Services requiring a License, and says it “may include, but is not limited to” business cards, websites, signage, social media, letterhead, and “email signatures.”

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Colorado real estate email signature requirements

Colorado's broker rules list email signatures among the things Advertising may include (Rule 1.2). Rule 6.10 requires advertising to be done clearly and conspicuously in the brokerage firm's name, and says a broker who advertises by email must use the brokerage firm's name. Rule 6.10 does not require a license number.

Regulator: Colorado Division of Real Estate (Real Estate Commission). Summarized from the rule text and official guidance linked below, as of October 15, 2026. Not legal advice.

Does the rule cover email?

Rule 1.2 defines Advertising as the promotion, solicitation, or representation of Real Estate Brokerage Services requiring a License, and says it “may include, but is not limited to” business cards, websites, signage, social media, letterhead, and “email signatures.”
Rule 1.2 also says a URL and an email address are not Advertising for purposes of Rule 6.10 so long as they are not directly used to promote or solicit Real Estate Brokerage Services.
Rule 6.10.D.3 says a broker who communicates through email, chat, instant messages, newsgroups, discussion lists, bulletin boards, blogs, or similar means for purposes of Advertising the broker's services must use the brokerage firm's name. Once the broker has disclosed the firm to a specific consumer, the broker need not keep making the same disclosure to that consumer.
Rule 6.10.D.4 says that when space in an electronic medium is limited, the firm's name must be disclosed clearly and conspicuously within the first click of the mouse.

Is a license number required?

Rule 6.10 does not require a license number in advertising. A search of the full broker-rules chapter we read for “license number” found no hit.
The identifier Rule 6.10 asks for is the name: Rule 6.10.A.4 says all Advertising must be done clearly and conspicuously in the name of the broker's brokerage firm.

Team names

Rule 1.52 defines a Team as two or more brokers within a brokerage firm that cooperate on an ongoing basis to conduct a substantial portion of their services together.
Rule 6.10.B.1 says team brokers must not advertise in a way that misleads the public about the team's brokerage firm, and prohibits these terms in a team name: Realty, Real estate, Realtors, Company, Corporation, Corp., Inc., LLC, LP or LLP, or any other term that would imply a separate entity from the brokerage firm.
Rule 6.10.B.2 says all team advertising must clearly and conspicuously include, and be in conjunction with, the legal name or trade name of the brokerage firm.
Rule 6.10.B.3 and B.4: the firm must provide the names of a team's brokers on request from a consumer, the Commission, or another brokerage or broker, and brokers may not let others outside the team's firm use the team name.

Anything specific to signatures

Rule 1.2 says Advertising “may include” email signatures; it does not say every signature is Advertising.
Rule 6.10.A.2 says a broker or firm must promote services only in the name under which it appears in the Commission's records, and the firm may also include its office locations. Rule 6.10.A.3 bars advertising that misleads the public about the identity of the broker or firm.
Rule 6.10.A.5 to A.7 allow one Trade Name filed with the Commission. A firm using a Trade Name or Trademark owned by a third party must use one of two statements, such as “Each office independently owned and operated,” in a clear and conspicuous manner.
Rule 6.10.A.8: a broker may not use a professional designation in Advertising unless in good standing and the designation is easily verifiable. An award, membership or achievement must be verifiable on request.
Rule 6.10.E: sales-data advertising that recaps activity in an area must cite the source and carry the disclaimer terms listed in the rule.

A practical checklist

Our reading of the rules above, not language from any rule. Your broker-in-charge has the final say.

Put the brokerage's legal name or filed trade name in the signature, matching the Commission's records.
If your brokerage uses a franchisor's name, include the independently owned and operated statement the rule requires.
If you use a team name, keep it free of the listed terms and show it together with the brokerage name.
List only designations you can show are current, and keep proof of any award you mention.
Have your employing broker confirm the final wording.

What we could not confirm

Rule text read: Commission Rules Regarding Real Estate Brokers (4 CCR 725-1) as printed in the Division's 2026 Colorado Real Estate Manual, Chapter 2 (PDF created January 8, 2026). The rules' effective-date footnote did not come through in the text we extracted.
The Division's rule-change notice says changes to Rule 6.10.A.2, 6.10.D and 6.10.F were adopted October 5, 2021, effective November 30, 2021. We did not find a later amendment to Rule 6.10 but did not read the Secretary of State's CCR database.
The Division's rules page was blocked (HTTP 403) and we found no Division FAQ or bulletin on email signatures.
Rule 6.10 cites section 12-10-203(9), C.R.S.; we did not read the statute itself.

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Sources (read October 15, 2026)

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