Registered Agent Reviewed › Illinois

How to check a registered agent in Illinois

Mainstay Filing is our pick in Illinois at $149 a year. To check any agent here: ask the Illinois Secretary of State how it records agents, confirm a Illinois street address, then apply the five criteria.

The Illinois rule

Every LLC must name a registered agent with an in-state street address. An Illinois resident, or a business authorized to do business in Illinois. The LLC cannot act as its own agent. 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. Changing agents costs $25. Source: 805 ILCS 180/1-35, checked October 20, 2026.

Providers reviewed in Illinois

• Mainstay Filing $149 a year, same at renewal.
• Harbor Compliance $99, then $159
• InCorp Services $129, same afterwards
• Northwest Registered Agent $125, same afterwards
• FreeRegisteredAgent.com $0, then $129
• ZenBusiness $99, then $199
• Registered Agents Inc $200, same afterwards
• Bizee $149, same afterwards
• LegalZoom $249, same afterwards