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The Formation Desk

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

Registered agent picks · Colorado

3 Best Registered Agents in Colorado (2026)

The The Formation Desk call for registered agents in Colorado in 2026: 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 takes the call: $149 a year for an agent that goes wherever the company does, plus the first three government mailings each year scanned free.
Written by The Formation Desk editorial team
1
Top pick on this page

1. Mainstay Filing: best for every state

$149 a year, and it holds on renewal

Editorial score 9.4 out of 10

The desk picks Mainstay Filing: $149 a year, and it holds on renewal, with papers served on the company scanned the same business day for free.

Haven't formed yet? Mainstay's $199-a-year package handles the Colorado filing and the periodic report.

Over three years Mainstay runs $150 more than CO Registered Agent.org, and the desk thinks the wider coverage is worth it.

In the price

  • A real in-state address as the registered office
  • Scanned service of process delivered the same business day at no cost
  • The first three pieces of government mail each year scanned at no charge
  • Compliance reminders

Strengths

  • First three government mailings each year, scanned free
  • $149 a year and it holds on renewal
  • Free scans of served papers on the same business day
  • Works for LLCs, corporations, LPs, LLPs and nonprofits alike

Cons

  • $50 a year more than CO Registered Agent.org for agent service alone
  • Annual reports need the formation package
Visit Mainstay FilingPartner link. We may earn money if you buy. Mainstay Filing up close
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Best local option

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

$99 a year, and it holds on renewal

Editorial score 8.9 out of 10

Runner-up, CO Registered Agent.org: $99 a year, holding on renewal, the lowest yearly price on this list.

With CO Registered Agent.org the registered office has a street address in the state, and served papers show up as scans online.

In the price

  • A street address in the state on the public record
  • Scanned copies of served legal papers, online

Strengths

  • A $99 plan with no renewal hike
  • LLC formation available, year-one agent included
  • A lower yearly price than Mainstay Filing

Cons

  • The periodic report is your job
  • Colorado only; you need another agent elsewhere
Visit CO Registered Agent.orgPartner link. We may earn money if you buy. CO Registered Agent.org up close
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Colorado only

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

$99 a year, and it holds on renewal

Editorial score 8.7 out of 10

Third, Colorado Registered Agent.co: $99 a year, holding on renewal, the lowest yearly price on this list.

Colorado Registered Agent.co puts an in-state street address on file for the company and scans served legal papers into your account.

CO Registered Agent.org and Colorado Registered Agent.co list the same prices and plan features, so it is close and either one works.

In the price

  • An in-state street address for the registered office
  • Papers served on the company arrive in your account as scans

Strengths

  • Costs less a year than Mainstay Filing
  • Also forms LLCs and includes the first agent year
  • $99 yearly, renewing at the same price

Cons

  • The periodic report is your job
  • Colorado only; you need another agent elsewhere
Visit Colorado Registered Agent.coPartner link. We may earn money if you buy. Colorado Registered Agent.co up close

The desk's 3 picks in brief

Pick Service Desk score Price a year Renewal Good for Visit
1 Mainstay Filing 9.4 $149 $149/yr One agent that covers every state Visit Mainstay FilingPartner link. We may earn money if you buy.
2 CO Registered Agent.org 8.9 $99 $99/yr The lowest yearly price we rank here Visit CO Registered Agent.orgPartner link. We may earn money if you buy.
3 Colorado Registered Agent.co 8.7 $99 $99/yr The lowest yearly price we rank here Visit Colorado Registered Agent.coPartner link. We may earn money if you buy.

The scores out of 10 are the desk's own, drawn from the criteria on How we rank. They are not customer ratings.

What a Colorado registered agent costs in 2026: year one, renewal and the three-year bill

Service Year one Year two Year three Bill over three years Price holds on renewal
Mainstay Filing $149 $149 $149 $447 Yes
CO Registered Agent.org $99 $99 $99 $297 Yes
Colorado Registered Agent.co $99 $99 $99 $297 Yes

Every price here was read off the company's own pages on November 12, 2026. Colorado charges the same state fees whichever agent you name.

How the desk made the call

The desk's method puts 33% on spend over three years and 33% on work the price removes, and 34% across what renewal looks like, fit with the state and plain price display. For Colorado, work the price removes did the deciding.

Mainstay's agent plan brings more to the table: served papers are scanned the same business day for nothing, one price in all fifty states and three government mailings a year scanned free. CO Registered Agent.org is cheaper, and it was close.

The full criteria and weights are on How we rank.

Colorado registered agent rules straight from 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. The law behind it: C.R.S. § 7-90-701.

Colorado's periodic report: what it costs, when it is due, who gets the notice

Colorado LLCs send in the periodic report every year, due last day of the entity's anniversary month. The state's fee is $25. Send it late and $50 gets added. Notices about it land with your registered agent.

Colorado registered agent: reader questions

Do you need a registered agent to run a Colorado LLC?

You do. Colorado wants a registered agent on file for every LLC, and the agent must have a street address in the state.

What should you expect to pay a Colorado registered agent?

Plan on $99 to $149 a year, and the price holds when it renews.

Could you serve as your own registered agent?

You can if the state's rules allow it. 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.

When does the Colorado periodic report have to go in?

Get it in by last day of the entity's anniversary month. The state's cut is $25. Miss the date and it costs $50 more.

Which registered agents did the desk rank here?

Mainstay Filing ($149 a year), CO Registered Agent.org ($99 a year) and Colorado Registered Agent.co ($99 a year), best pick first.

Who is our pick for registered agent in Colorado?

Mainstay Filing, since $149 for a single agent plan that works in every state, $149 on renewal.

More from us

Where the numbers came from

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