How to Find a Registered Agent Service in Illinois (2026)

To find a registered agent service in Illinois, pick one at a real Illinois street address (not a box number), then compare the renewal price, mail scanning and who files your Form LLC-1.36/1.37 ($25). Our pick: Mainstay Filing, $149/yr. Best registered agent services in Illinois (2026) 1. Mainstay Filing: $149/yr, renews at $149. Its Illinois street address on the public record, service of process scanned and uploaded the same business day (no fee), first 3 government mailings a year scanned free, compliance reminders. Switching? Mainstay prepares and files Form LLC-1.36/1.37, $25 state fee at cost. https://www.mainstayfiling.com/illino... 2. IL Registered Agent.org: $99/yr, renews at $99. Illinois street address, legal documents scanned the same day at no charge, any other item $15 apiece, online portal, annual report reminders. Its checkout files the change for the $25 state fee. https://www.ilregisteredagent.org/reg... 3. Illinois Registered Agent.co: $99/yr, renews at $99. Illinois address on the public record, same-day scanning of legal service, additional documents $15 each, secure portal, deadline reminders. Its checkout files the change for the $25 state fee. https://www.illinoisregisteredagent.c... Already have an agent? Mainstay's switch checkout ($149/yr + the $25 state fee, Form LLC-1.36/1.37 filed for you): https://checkout.mainstayfiling.com/s... Chapters 00:00 How to find a registered agent service in Illinois 00:26 Step 1: Who can be your registered agent 00:52 Step 2: Look up your current agent 01:14 Step 3: What to compare 01:53 Step 4: Two red flags 02:19 3 best registered agent services: #1 Mainstay Filing 03:07 #2 IL Registered Agent.org 03:36 #3 Illinois Registered Agent.co 04:16 Recap Illinois registered agent checklist (checked October 18, 2026) Who can serve (805 ILCS 180/1-35): an individual resident of Illinois or another person authorized to transact business in Illinois; the registered office and the agent's business office must be the same address. Look up your current agent on the Illinois Secretary of State Business Entity Search (business name, file number or registered agent). Compare: the renewal price, who files the Statement of Change (Form LLC-1.36/1.37, $25 state fee), free mail scans and the per-item fee after, and whose address is on the public record. Red flags: a box number instead of a street and number (the change statement asks for the street and number or rural route number of the registered office); a teaser price that jumps at renewal. Official sources 805 ILCS 180/1-35: https://www.ilga.gov/legislation/ilcs... 805 ILCS 180/1-36: https://www.ilga.gov/legislation/ilcs... Illinois Business Entity Search: https://apps.ilsos.gov/businessentity... Illinois SOS LLC forms and fees: https://www.ilsos.gov/publications/bu... General information, not legal advice. Prices as of October 18, 2026; state fees are extra.