As of October 20, 2026, ListRiver's records show 525,945 active registered businesses in Cook County, Illinois, more than any other county in Illinois. 55% are LLCs. 6,936 were formed in September 2026. That is 50% of all Illinois businesses on record.
How many businesses are registered in Cook County, Illinois?
ListRiver has 525,945 active registered businesses in Cook County, Illinois on record as of October 20, 2026, from official Illinois business registry data. Dissolved and defunct businesses are not counted.
How many new businesses were formed in Cook County, Illinois in September 2026?
6,936 businesses on record in Cook County, Illinois were formed in September 2026.
How many new businesses opened in Cook County, Illinois in the last 12 months?
82,591 businesses on record in Cook County, Illinois were formed in the 12 months through September 2026.
What is the most common type of business in Cook County, Illinois?
LLCs are the most common: 290,041 of 525,945 businesses on record (55%), followed by Corporations with 183,160 (35%).
Where does this data come from?
From Illinois's official business registry. ListRiver loads each new state file, standardizes it, removes duplicates and updates its database weekly. Email and industry details are added from SMBCredit.net where available.
How do I get a list of businesses in Cook County, Illinois?
Use ListRiver's list builder to filter Cook County, Illinois businesses by entity type, formation date, industry and contact details, see the exact count and price, and download a CSV. Every list includes monthly refresh files.
Free to use on any site, and it updates itself every month. Copy this code and paste it into your page. Preview the chart.
Counts come from official Illinois business registry records on file with ListRiver, current as of October 20, 2026. They include businesses that are active on the state register; dissolved and defunct entities are excluded. Contact details are added from SMBCredit.net where available. Formation months reflect the registration date the state reports. See the methodology for sources, update schedules and known limits.