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Quick answer · Illinois

3 Best Registered Agents in Illinois (2026), Ranked

Illinois 2026 ranking of registered agents: Illinois Registered Agent.co ($99 a year), IL Registered Agent.org ($99 a year) and Mainstay Filing ($149 a year). Agent prices start at $99 to $149 in year one and total $297 to $447 over three.

LLC Q and A editorial team ·

At a glance

Agent required?
Yes, by statute
Statute term
Registered agent
Typical price
$99 to $149 yearly
Our pick
Illinois Registered Agent.co, IL Registered Agent.org then Mainstay Filing

Illinois: ranked picks

Prices come from each company's own page. See the method.
1Top pick

1. Illinois Registered Agent.co: best for one-state companies

Year one $99, later years $99

Reason for Illinois Registered Agent.co at the top: an in-state agent for $99 a year.

Lower three-year cost than Mainstay Filing, and cost is the heaviest criterion.

Price covers

  • In-state address
  • Legal papers scanned online

For

  • Lower yearly bill than the national pick
  • Fixed $99 yearly

Against

  • Second state, second agent
  • The Limited Liability Company Annual Report falls to you
Illinois Registered Agent.co sitePartner link. We may earn money if you buy.
2Illinois only

2. IL Registered Agent.org: best for another local option

Year one $99, later years $99

Second: IL Registered Agent.org, because an in-state agent for $99 a year.

Same published prices as Illinois Registered Agent.co, so the order between them is close.

Price covers

  • In-state address
  • Legal papers scanned online

For

  • Fixed $99 yearly
  • Lower yearly bill than the national pick

Against

  • Second state, second agent
  • The Limited Liability Company Annual Report falls to you
IL Registered Agent.org sitePartner link. We may earn money if you buy.
3All fifty states

3. Mainstay Filing: best for one price in all states

Year one $149, later years $149

Mainstay Filing ranks third since price: $149 a year in all states, $149 at renewal.

Ranked lower because three years cost $150 more than Illinois Registered Agent.co, and cost has the biggest weight.

Price covers

  • In-state street address
  • Free scans: three government mailings per year
  • Not limited to LLCs: corporations, LPs, LLPs and nonprofits as well

For

  • Fixed $149 yearly
  • Same price in all fifty states

Against

  • Illinois Registered Agent.co is $50 lower each year
  • Report filing needs the formation package
Mainstay Filing sitePartner link. We may earn money if you buy.

Comparison

#CompanyFirst yearRenewal3-year costIncludes
1Illinois Registered Agent.co$99$99/yr$297In-state address; legal papers scanned onlineIllinois Registered Agent.co sitePartner link. We may earn money if you buy.
2IL Registered Agent.org$99$99/yr$297In-state address; legal papers scanned onlineIL Registered Agent.org sitePartner link. We may earn money if you buy.
3Mainstay Filing$149$149/yr$447In-state street address; Free scans: three government mailings per year; Not limited to LLCs: corporations, LPs, LLPs and nonprofits as wellMainstay Filing sitePartner link. We may earn money if you buy.
Service fees only, from company price pages read November 13, 2026. State fees are identical for every pick.

Questions and replies

Must the LLC name a registered agent?

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

Law: 805 ILCS 180/1-35. ilga.gov (October 2026) is the source of record

Who qualifies?

An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent.

Meeting the rule makes the role free.

What does an agent cost?

$99 to $149 a year with our picks; $297 to $447 over three years.

State fees do not change with your choice of agent.

Why have an agent?

Receives legal papers and state notices for the company in Illinois.

Prompt forwarding matters more than anything else about an agent. Service of process, defined

What does the state bill each year?

Calendar the Limited Liability Company Annual Report (annual, $75). The deadline rule says before the first day of the entity's anniversary month, which is worth a calendar entry.

ilsos.gov (October 2026) is the source of record

Why this order?

Three-year price (36%) goes to Illinois Registered Agent.co.

Five criteria: three-year price (36%), chores removed from your list (26%), price shown up front (15%), year-two bill (12%) and states served (11%).

Illinois Registered Agent.co: $297 for three years, $150 below Mainstay Filing.

The five criteria

Illinois: agent requirements, sourced

ItemRule or amountSource
Fee to form$150ilsos.gov (October 2026) is the source of record
Registered agentYes, by statuteilga.gov (October 2026) is the source of record
Limited Liability Company Annual Report$75 every yearilsos.gov (October 2026) is the source of record
Three-year state total$300Total of the rows above
The last row adds the filing, two reports and any minimum tax. Variable costs are explained in the text and left out of the sum.

Also asked

Can I be my own agent?

Yes, when your address and status fit the rule. Many owners still hire a service for privacy.

Which addresses are accepted?

The address has to be a registered office in Illinois that matches the agent's business office. A P.O. box alone is not accepted.

Three-year cost of each?

Illinois Registered Agent.co will run $297, IL Registered Agent.org will run $297, Mainstay Filing will run $447

Where do the numbers come from?

State fees come from Illinois's official documents. Service prices come from each company's price page. Both are dated here.

Is a service required?

Not required. The state takes filings from owners.

Which registered agent should I use in Illinois?

Illinois Registered Agent.co: $99 annually puts a street address on file. Behind it: IL Registered Agent.org and Mainstay Filing.

Source list

  1. Q and A source note covering Illinois Secretary of State, Department, found at ilsos.gov and dated August 2026, kept on file
  2. Q and A source note covering Illinois Secretary of State, Department, found at ilsos.gov and dated August 2026, kept on file
  3. Q and A source note covering 805 ILCS 180/5-5, found at ilga.gov and dated August 2026, kept on file
  4. Q and A source note covering Illinois formation fee: Filing fee, found at ilga.gov and dated October 2026, kept on file
  5. Q and A source note covering Illinois formation fee: Filing fee, found at ilsos.gov and dated October 2026, kept on file
  6. Q and A source note covering Illinois registered agent statute, found at ilga.gov and dated October 2026, kept on file
  7. Price page: Illinois Registered Agent.co pricing page, accessed November 13, 2026
  8. Price page: IL Registered Agent.org pricing page, accessed November 13, 2026
  9. Price page: Mainstay Filing Illinois service page, accessed November 13, 2026