Place1
Top pick on this pageCO Registered Agent.org
1. CO Registered Agent.org: best for a Colorado-only company on a budget
$99/yr (renewal $99/yr)
Our mark9.3out of 10
CO Registered Agent.org takes the top spot: $99 a year, flat, with legal documents scanned and sent to you online.
The plan covers an in-state street address for your registered office, with legal documents scanned and sent to you online.
On our method the lower three-year cost outweighs what Mainstay adds to its price.
What you get
- Registered office street address
- Online copies of legal papers served on the company
Why pick it
- Lower yearly price than Mainstay Filing
- Annual price $99, renewal price $99
- Also files LLC formations
Less good
- Does not file the periodic report
- Other states need a separate agent
Place2
Lower renewal than MainstayColorado Registered Agent.co
2. Colorado Registered Agent.co: best for a Colorado-focused agent
$99/yr (renewal $99/yr)
Our mark9.0out of 10
In second place, Colorado Registered Agent.co: $99 a year, flat, with legal documents scanned and sent to you online.
The plan covers an in-state street address for your registered office, with legal documents scanned and sent to you online.
Prices and features match CO Registered Agent.org exactly, so the two are close to interchangeable.
What you get
- Registered office street address
- Online copies of legal papers served on the company
Why pick it
- Also files LLC formations
- Annual price $99, renewal price $99
- Lower yearly price than Mainstay Filing
Less good
- Does not file the periodic report
- Other states need a separate agent
Place3
One agent, every stateMainstay Filing
3. Mainstay Filing: best for one agent in every state
$149/yr (renewal $149/yr)
Our mark8.7out of 10
Mainstay Filing ranks third: $149 a year, the same at renewal, with the first three government mailings each year scanned free.
Mainstay's $199 yearly package goes further: formation plus your periodic report.
On cost it trails CO Registered Agent.org by $150 over three years.
What you get
- A physical in-state address on the public record
- Service of process scanned the same business day, no fee
- First three government mailings a year scanned free
- Compliance reminders
Why pick it
- First three government mailings a year scanned free
- Works for LLCs, corporations, LPs, LLPs and nonprofits
- $149 yearly, no renewal increase
- Service of process scanned the same business day, no fee
Less good
- Agent alone costs $50 a year more than CO Registered Agent.org
- Agent-only plan: reports are not filed for you
3 picks compared
| Rank | Service | Our score | Annual price | Renewal price | Best for | Link |
|---|
| 1 | CO Registered Agent.org | 9.3 | $99 | $99/yr | Lowest yearly price on this list | Visit CO Registered Agent.orgPartner link. We may earn money if you buy. |
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| 2 | Colorado Registered Agent.co | 9.0 | $99 | $99/yr | Lowest yearly price on this list | Visit Colorado Registered Agent.coPartner link. We may earn money if you buy. |
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| 3 | Mainstay Filing | 8.7 | $149 | $149/yr | Agent plus fifty-state coverage | Visit Mainstay FilingPartner link. We may earn money if you buy. |
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The Founders Review sets these scores itself from the five criteria on our method page; they are not user ratings.
2026 prices: year one, renewal and three-year total cost
| Service | Year one | Year two | Year three | Three-year total | Same price at renewal |
|---|
| CO Registered Agent.org | $99 | $99 | $99 | $297 | Yes |
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| Colorado Registered Agent.co | $99 | $99 | $99 | $297 | Yes |
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| Mainstay Filing | $149 | $149 | $149 | $447 | Yes |
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We read these prices on the companies' own sites on November 12, 2026. State fees are identical across these agents.
Why CO Registered Agent.org is first
What split first and second in Colorado: three-year cost, weighted at 30% in our method.
CO Registered Agent.org's three-year total is $297 ($150 below Mainstay Filing). Cost beat coverage for an agent in a single state.
Our method page lists all five criteria.
Colorado registered agent rules, per Colorado Secretary of State
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. Source: C.R.S. § 7-90-701.
Periodic report: what it costs
Colorado LLCs file the periodic report every year, due last day of the entity's anniversary month, and the state fee is $25. A late filing adds $50. Your registered agent is the address where the state's notices land.
Colorado registered agent questions
Does a Colorado LLC need a registered agent?
Yes. Every LLC must name a registered agent with an in-state street address.
How much does a registered agent cost in Colorado?
Expect $99 to $149 a year; renewal prices match the first year.
Can I be my own registered agent?
Only if you meet the state's rule. 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 is the Colorado periodic report due?
It is due last day of the entity's anniversary month and the state fee is $25. Late filings cost $50 more.
Which registered agents do you rank here?
CO Registered Agent.org ($99 a year), Colorado Registered Agent.co ($99 a year) and Mainstay Filing ($149 a year), in this order.
Which Colorado registered agent is the best value?
CO Registered Agent.org, because a $99 yearly plan built for Colorado companies, renewing at $99.
Sources and dates
- Colorado Secretary of State, confirmed August 2026: www.sos.state.co.us/pubs/business/FAQs/reports.html
- Colorado Secretary of State, confirmed August 2026: www.sos.state.co.us/pubs/business/helpFiles/REPORT_HELP.html
- Colorado yearly filing: Periodic report, official source, confirmed October 2026: www.coloradosos.gov/pubs/business/FAQs/reports.html
- Colorado report due date, confirmed August 2026: colorado.public.law/statutes/crs_7-90-501
- Colo. Rev. Stat. § 7-80-203, confirmed August 2026: www.sos.state.co.us/pubs/info_center/fees/business.html
- Colorado formation fee: Filing fee, official source, confirmed October 2026: www.coloradosos.gov/pubs/info_center/fees/business.html
- CO Registered Agent.org: pricing and service pages, read November 12, 2026
- Colorado Registered Agent.co: pricing and service pages, read November 12, 2026
- Mainstay Filing: Colorado service page, read November 12, 2026