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LLC UnpackedEvery filing, unpacked: the fee, the form, the catch.

Unpacked · Colorado

3 Best Registered Agents in Colorado (2026): What Is Inside Each

Colorado, 2026: Mainstay Filing ($149 a year), Colorado Registered Agent.co ($99 a year) and CO Registered Agent.org ($99 a year), in that order, are the registered agents worth opening first. An agent opens at $99 to $149 in the first year and totals $297 to $447 by year three.
Unpacked by the LLC Unpacked editorial team

Four things inside

Required to name one?
Yes, by law
Label in the statute
Registered agent
What agents charge
$99 to $149 per year
Our pick
Mainstay Filing, Colorado Registered Agent.co then CO Registered Agent.org

Our Colorado picks, opened up

The order follows our five layers: three-year cost first, then what the price covers.
Ranked first

1. Mainstay Filing: best for one price in every state

Annual price $149, renewal price $149

What puts Mainstay Filing first: one account at $149 a year covers whichever state the LLC registers in.

Colorado Registered Agent.co would save $150 across three years if the LLC stays in Colorado.

Inside the price

  • A street address inside the state
  • Scans of three government mailings a year at no charge
  • Reaches beyond LLCs: corporations, LPs, LLPs and nonprofits

Inside, the good

  • Annual price $149, renewal price $149
  • A single account works in any state

Inside, the catch

  • $50 a year more than Colorado Registered Agent.co
  • Agent role only, no report filing
Colorado only

2. Colorado Registered Agent.co: best for an LLC that stays in the state

Annual price $99, renewal price $99

What puts Colorado Registered Agent.co second: inside the price is an agent in the state for $99 a year.

Inside the price

  • An in-state street address
  • Legal papers scanned to your account

Inside, the good

  • Costs less a year than Mainstay Filing
  • Just $99 a year

Inside, the catch

  • Single-state coverage
  • The periodic report sits outside the box
Colorado only

3. CO Registered Agent.org: best for another in-state option

Annual price $99, renewal price $99

What puts CO Registered Agent.org third: inside the price is an agent in the state for $99 a year.

It charges what Colorado Registered Agent.co charges.

Inside the price

  • An in-state street address
  • Legal papers scanned to your account

Inside, the good

  • Just $99 a year
  • Costs less a year than Mainstay Filing

Inside, the catch

  • Single-state coverage
  • The periodic report sits outside the box

Side by side

#CompanyOpening priceRenewalThree-year totalCovers
1Mainstay Filing$149$149/yr$447A street address inside the state; scans of three government mailings a year at no charge; Reaches beyond LLCs: corporations, LPs, LLPs and nonprofitsOpen Mainstay FilingPartner link. We may earn money if you buy.
2Colorado Registered Agent.co$99$99/yr$297An in-state street address; legal papers scanned to your accountOpen Colorado Registered Agent.coPartner link. We may earn money if you buy.
3CO Registered Agent.org$99$99/yr$297An in-state street address; legal papers scanned to your accountOpen CO Registered Agent.orgPartner link. We may earn money if you buy.
Prices as of November 13, 2026. The state's own fees are in the checklist below.

Opened up, question by question

Is a registered agent required?

Every LLC must name a registered agent with an in-state street address.

Statute: C.R.S. § 7-90-701. peek at sos.state.co.us, confirmed October 2026

Who is allowed to be the agent?

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.

A qualifying owner can be the agent for free.

What is inside an agent's price?

$99 to $149 annually, $297 to $447 in total across three years.

State fees stay the same whichever agent you pick.

What does an agent handle for the LLC?

Court papers and state notices for the company land at the agent's Colorado address first.

What matters is that nothing important sits unnoticed while you are away. Service of process, unpacked

Is anything else due every year?

The periodic report comes back each year, for $25. Its date, in the state's words, is last day of the entity's anniversary month.

peek at coloradosos.gov, confirmed October 2026

What put number one on top?

On what is inside the price (29%), Mainstay Filing comes out ahead.

Five layers set the order: total across three years (34%), what is inside the price (29%), price laid out in the open (14%), how the renewal behaves (12%) and how far it reaches (11%).

Only the first pick holds up in all fifty states, and that counts the day the LLC registers elsewhere.

How we open it up

Colorado agent rule, unpacked

RequirementAmount or rulePeek at source
LLC filing fee$50peek at coloradosos.gov, confirmed October 2026
Registered agentYes, by lawpeek at sos.state.co.us, confirmed October 2026
Periodic report$25 every yearpeek at coloradosos.gov, confirmed October 2026
What the state collects in three years$100The rows above, stacked
To check the total yourself, add the filing fee, the next two reports and any minimum tax. Costs without a set amount are left out.

More boxes to open

May an owner serve as agent?

Yes, when your address and status match the rule. Many owners still hire a service to keep an address private.

Which addresses does the state accept?

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.

How do the three-year totals compare?

Mainstay Filing stacks up to $447, Colorado Registered Agent.co stacks up to $297, CO Registered Agent.org stacks up to $297

Are the fees official?

The state-side figures were taken from Colorado's own publications, and the service prices from the price page each company posts. Dates for both appear on this page.

Does the law require one?

Not required. The state takes filings from owners.

Which registered agent should I open first in Colorado?

Mainstay Filing, because $149 a year moves with the company into a new state. Then Colorado Registered Agent.co and CO Registered Agent.org.

What the page rests on

  1. Unpacking Colorado Secretary of State led us to sos.state.co.us, confirmed August 2026, which you can open yourself
  2. Unpacking Colorado Secretary of State led us to sos.state.co.us, confirmed August 2026, which you can open yourself
  3. Unpacking Colorado yearly filing: Periodic report led us to coloradosos.gov, confirmed October 2026, which you can open yourself
  4. Unpacking Colorado report due date led us to colorado.public.law, confirmed August 2026, which you can open yourself
  5. Unpacking Colo led us to sos.state.co.us, confirmed August 2026, which you can open yourself
  6. Unpacking Colorado formation fee: Filing fee led us to coloradosos.gov, confirmed October 2026, which you can open yourself
  7. The Mainstay Filing Colorado service page, opened November 13, 2026
  8. The Colorado Registered Agent.co pricing page, opened November 13, 2026
  9. The CO Registered Agent.org pricing page, opened November 13, 2026