3 Best Registered Agents in Illinois (2026) for You
Our 2026 Illinois ranking, best first, is IL Registered Agent.org ($99 a year), Mainstay Filing ($149 a year) and Illinois Registered Agent.co ($99 a year). Expect $99 to $149 for the first year and $297 to $447 for three.
By the LLC Answered editorial team
In brief
Short reply
Mandatory here?
Yes, by law
What the law calls it
Registered agent
Cost of a service
$99 to $149 per year
Our ranking
IL Registered Agent.org, Mainstay Filing then Illinois Registered Agent.co
Hire these in Illinois
Order set by our five tests: three-year cost first, then what the price covers.
#1Our answer: this one
1. IL Registered Agent.org: best for holding down three-year cost
$99 per year, then $99 on renewal
Why IL Registered Agent.org? Simply put, $99 a year, renewing at $99, suits an LLC that stays in Illinois.
Of the two, it has the lower three-year cost, which is what we weigh first.
What is bundled
An address in the state
Service papers posted online
Pluses
Smaller yearly bill than the national pick
$99 annually
Downsides
No coverage outside the state
The Limited Liability Company Annual Report is yours to file
#2Coverage everywhere
2. Mainstay Filing: best for LLCs that may expand
$149 per year, then $149 on renewal
Mainstay Filing is number 2, because $149 a year, with the same price in all fifty states.
Over three years it costs $150 more than IL Registered Agent.org, and cost carries the most weight.
What is bundled
Office address inside the state
Scans of three government mailings per year, free
Works for corporations, LPs, LLPs and nonprofits as well as LLCs
Pluses
One price across all fifty states
Flat $149 yearly
Downsides
$50 a year more than IL Registered Agent.org
Does not file the yearly report
#3For Illinois
3. Illinois Registered Agent.co: best for staying local
$99 per year, then $99 on renewal
In third spot, Illinois Registered Agent.co, as $99 a year, renewing at $99, suits an LLC that stays in Illinois.
Its prices match IL Registered Agent.org exactly, so either works.
What is bundled
An address in the state
Service papers posted online
Pluses
Smaller yearly bill than the national pick
$99 annually
Downsides
No coverage outside the state
The Limited Liability Company Annual Report is yours to file
The picks compared
#
Who
First year
Renews at
Three-year cost
Price buys
1
IL Registered Agent.org
$99
$99/yr
$297
an address in the state; service papers posted online
Plan on the Limited Liability Company Annual Report ($75, annual). It falls due before the first day of the entity's anniversary month; put the date in your calendar.
ilsos.gov, last confirmed October 2026, official site
Why is number one first?
IL Registered Agent.org is strongest on three-year price, which counts 36% in our ranking.
65% of the score comes from three-year price and paperwork covered.
$297 for three years at IL Registered Agent.org is $150 below Mainstay Filing.