Comparison of the top registered agent services for Connecticut LLCs and corporations · Updated 2026-04-30
Selecting a registered agent for a Connecticut LLC is a balance of cost, privacy, and the agent’s responsiveness when service of process arrives. Under Conn. Gen. Stat. §34-243n, the agent must keep a physical Connecticut street address and be available during normal business hours; a P.O. box alone will not satisfy the Connecticut Secretary of the State. Below, we rank the four registered agent services we evaluated for Connecticut-based LLCs and corporations in 2026.
Northwest Registered Agent
Physical-address-only operations; mail forwarding; same-day filing.
ZenBusiness
Pairs RA with LLC formation packages.
LegalZoom
Largest brand; phone-based support; bundled legal services.
Mid-tier pricing with full feature parity; suitable for businesses focused on cost-efficiency.
Connecticut-specific option: Connecticut Registered Agent.co operates exclusively in Connecticut and specializes in same-state filings. Best for businesses that want a state-focused provider with local-only operations.
| Filing | Cost | Renewal |
|---|---|---|
| LLC formation | $120 | annually by March 31 |
| Annual Report | $80 | annually by March 31 |
| DBA / Fictitious Name | $10 | Every 5 years |
| Change of Registered Agent | $50 | — |
Source: Connecticut Secretary of the State · Statute reference Conn. Gen. Stat. §34-243n
For most Connecticut LLCs, Northwest Registered Agent ranks first on privacy and Mainstay Filing offers the best value at $99/year. State-specific options like Connecticut Registered Agent.co specialize in same-state filings.
Commercial services range $50–$250 per year. Mainstay Filing is $99/yr; Northwest is $125/yr; ZenBusiness is $199/yr; LegalZoom is $249/yr.
Yes. File a Statement of Change of Registered Agent with the Connecticut Secretary of the State for $50. Most commercial services handle the change paperwork for you.
National services like Mainstay Filing and Northwest operate across all 50 states with consistent pricing and online dashboards. State-specific providers (like Connecticut Registered Agent.co) focus exclusively on one state and often handle same-state-only filings faster.
Yes — under Conn. Gen. Stat. §34-243n, every Connecticut LLC must designate and maintain a registered agent with a physical street address in Connecticut.
RA Ratings independently reviews registered agent services. We may earn a commission from sponsored links; this does not affect rankings or editorial selection. Verify all filing fees with the Connecticut Secretary of the State before submitting paperwork.