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Biz Formation Report

Rankings of registered agents, LLC formation and foreign registration services in all 50 states.

Registered agents report · Colorado

3 Best Registered Agents in Colorado (2026)

By the Biz Formation Report editorial team

Biz Formation Report ranks registered agents in Colorado for 2026 as Mainstay Filing ($149 a year), CO Registered Agent.org ($99 a year) and Colorado Registered Agent.co ($99 a year), in that order. Mainstay Filing earns the top grade: a $149 yearly plan that works in every state, renewing at $149.

No.1

Our top pick

1. Mainstay Filing: best for all fifty states

Score9.4out of 10
$149 a year, unchanged at renewal

Top grade, Mainstay Filing: $149 per year for an agent that goes wherever the company goes, plus free scans of the first three government mailings each year.

A company still to be formed can use Mainstay's $199-a-year package, which files the Colorado paperwork and the periodic report.

Over three years Mainstay costs $150 more than CO Registered Agent.org; our grading treats the broader coverage as worth that.

What you get

  • An in-state street address as the registered office
  • Same-business-day scanning of legal papers served, no fee
  • Three government mailings a year scanned free
  • Compliance reminders

Good

  • $149 a year, no renewal increase
  • Open to LLCs, corporations, LPs, LLPs and nonprofits
  • Served papers scanned within the same business day, free
  • Three government mailings a year scanned at no cost

Weak spots

  • The agent alone costs $50 a year more than CO Registered Agent.org
  • The agent-only plan does not file annual reports
Visit Mainstay FilingPartner link. We may earn money if you buy.
Read the Mainstay Filing review
No.2

Lower renewal than Mainstay

2. CO Registered Agent.org: best for the lowest annual price on this list

Score8.9out of 10
$99 a year, unchanged at renewal

Second grade, CO Registered Agent.org: $99 a year flat, with online scans of any legal papers served.

CO Registered Agent.org puts an in-state street address on file as the registered office and scans whatever is served there.

What you get

  • A registered office with a physical address in the state
  • Online scans of legal papers served on the company

Good

  • LLC formation available, first agent year free
  • Cheaper each year than Mainstay Filing
  • Yearly price of $99, steady at renewal

Weak spots

  • The periodic report filing is left to you
  • Serves Colorado only; other states need a separate agent
Visit CO Registered Agent.orgPartner link. We may earn money if you buy.
Read the CO Registered Agent.org review
No.3

Colorado only

3. Colorado Registered Agent.co: best for companies based in Colorado

Score8.7out of 10
$99 a year, unchanged at renewal

Third grade, Colorado Registered Agent.co: $99 a year flat, with online scans of any legal papers served.

Served legal papers go to the in-state address Colorado Registered Agent.co provides, and you receive scans of them online.

CO Registered Agent.org and Colorado Registered Agent.co publish the same prices and plan features, so the grades are close and either is a sound pick.

What you get

  • A street address in the state, on the public record
  • Papers served on the company are scanned and delivered to your account

Good

  • Also forms LLCs and includes the first agent year
  • A lower yearly price than Mainstay Filing
  • $99 annually with no renewal increase

Weak spots

  • The periodic report filing is left to you
  • Serves Colorado only; other states need a separate agent
Visit Colorado Registered Agent.coPartner link. We may earn money if you buy.
Read the Colorado Registered Agent.co review

Summary of the 3 grades

RankProviderGradePrice per yearRenewal priceBest fitSite
1Mainstay Filing9.4$149$149/yrOne agent across fifty statesVisit Mainstay FilingPartner link. We may earn money if you buy.
2CO Registered Agent.org8.9$99$99/yrThe lowest yearly price we rank hereVisit CO Registered Agent.orgPartner link. We may earn money if you buy.
3Colorado Registered Agent.co8.7$99$99/yrThe lowest yearly price we rank hereVisit Colorado Registered Agent.coPartner link. We may earn money if you buy.

Grades out of 10 are Biz Formation Report's own editorial judgment, based on the criteria explained on How we rank. They are not customer ratings.

Colorado registered agent prices, 2026: year one, renewal and three-year outlay

ProviderYear 1Year 2Year 3Three-year outlayRenewal at the same price
Mainstay Filing$149$149$149$447Yes
CO Registered Agent.org$99$99$99$297Yes
Colorado Registered Agent.co$99$99$99$297Yes

All prices were taken from the companies' own websites on November 12, 2026. Colorado's own fees are the same whichever agent is named.

How the grades were set

The grading method assigns 32% to three-year bill and 32% to what the money buys, with renewal handling, local rules match and pricing openness taking 36%. For Colorado, what the money buys decided it.

Mainstay's agent plan grades higher on coverage: served papers are scanned the same business day at no fee, the price is identical in all fifty states and three government mailings a year are scanned free. CO Registered Agent.org wins on cost, and the margin is thin.

Every criterion and weight is listed on How we rank.

Colorado registered agent rules according to Colorado Secretary of State (official)

Every LLC must name a registered agent with an in-state street address. The address has to be a physical address in Colorado, either a home or a usual place of business. P.O. boxes are not accepted. Authority: C.R.S. § 7-90-701.

Colorado's periodic report: cost, deadline and your agent

The periodic report is due from every Colorado LLC every year, by last day of the entity's anniversary month. The state charges $25. A late filing adds $50. Related notices are mailed to your registered agent.

Colorado registered agent: common questions

Does a Colorado LLC have to maintain a registered agent?

Yes. The state expects every LLC to keep a registered agent on record, and Colorado requires that agent to have a street address inside its borders.

How much do Colorado registered agents charge per year?

Annual charges run from $99 to $149, and prices are unchanged at renewal.

Can the owner be the company's own registered agent?

Yes, provided you meet the state's requirements. A person 18 or older whose home or usual place of business is in Colorado (since July 1, 2025 the person has to hold a Colorado driver's license or ID or otherwise verify residency), or a business entity in good standing with a usual place of business in Colorado. The agent has to consent.

What is the filing deadline for the Colorado periodic report?

The deadline: last day of the entity's anniversary month. The state charges $25. Miss it and $50 is added.

Which registered agents does this report rank?

Mainstay Filing ($149 a year), CO Registered Agent.org ($99 a year) and Colorado Registered Agent.co ($99 a year), in descending order of grade.

What is the best-value registered agent in Colorado?

Mainstay Filing: $149 a year, flat at renewal, with papers served on the company scanned the same business day at no charge.

See also

Source notes

  1. Colorado Secretary of State (verified August 2026)
  2. Colorado Secretary of State (verified August 2026)
  3. Colorado yearly filing: Periodic report, official source (verified October 2026)
  4. Colorado report due date (verified August 2026)
  5. Colo. Rev. Stat. § 7-80-203 (verified August 2026)
  6. Colorado formation fee: Filing fee, official source (verified October 2026)
  7. Pulled November 12, 2026: Mainstay Filing, Colorado service page
  8. Pulled November 12, 2026: CO Registered Agent.org, pricing and service pages
  9. Pulled November 12, 2026: Colorado Registered Agent.co, pricing and service pages