IT companies in Illinois: what 1,466 listings show

Illinois is home to 1,466 published IT service providers, part of a national directory that tracks 43,710 providers across all 50 states. The Illinois figures offer a view into how these companies are distributed by city, size, customer feedback, and support availability.

Where Illinois providers are based

Chicago accounts for 437 of the state's listed IT service providers, the largest concentration by a wide margin. Schaumburg follows with 80 providers, then Naperville with 64. Peoria rounds out the mid-tier cities with 24 providers, and Downers Grove is close behind with 23. Together these five cities represent a significant share of the state's published total of 1,466, though providers are also based in smaller cities and towns across Illinois that fall outside this top-five list.

Company size

Among Illinois providers, the median headcount is 10 employees. This places the typical Illinois IT service provider in the small-business range rather than among large enterprises. A median of 10 employees suggests that most of the state's 1,466 listed providers operate with lean teams rather than large staffs.

Customer ratings

Of the 1,466 Illinois providers, 718 have a Google rating attached to their listing, which works out to 49.0% of the total. Among those with a rating, the median rating is 5.00. This means that roughly half of Illinois providers carry a public rating signal, and the midpoint of those ratings sits at the top of the scale.

Support hours

Support availability is another data point tracked for Illinois providers. Of the 1,466 total, 1,027 have known support hours listed. Among those 1,027, 255 offer 24/7 support, which is 24.8% of that group. This indicates that around a quarter of Illinois providers with documented support hours operate around the clock, while the remaining majority maintain more limited support windows.

Putting the numbers together

The Illinois dataset of 1,466 providers sits within a national total of 43,710 published IT service providers spanning all 50 states. Within Illinois, the geographic concentration in Chicago, Schaumburg, and Naperville stands out, with these three cities alone accounting for a substantial portion of the state's listed providers. Peoria and Downers Grove, while smaller in count, still represent meaningful hubs outside the Chicago metro area.

The median employee count of 10 across Illinois providers points to a landscape dominated by small firms rather than large organizations. This is consistent with the broader pattern seen in directories of this kind, where smaller, regionally focused providers make up the bulk of listings.

On the ratings side, just under half of Illinois providers (49.0%) have a Google rating on file, and those that do carry a median rating of 5.00. This leaves slightly more than half of the state's providers without a public rating attached to their listing, which may reflect newer businesses, limited online review activity, or other factors not captured in this dataset.

Support hours data, available for 1,027 of the 1,466 Illinois providers, shows that 24/7 availability is the exception rather than the rule. At 24.8%, roughly a quarter of providers with known hours offer round-the-clock support, while the remaining three-quarters operate during more defined windows.

Taken together, these figures describe a state market of 1,466 IT service providers concentrated in a handful of major cities, typically small in size, split close to evenly on public rating visibility, and predominantly operating outside of 24/7 support hours.