Business phone system for computer systems design services firms in Illinois

How many computer systems design services firms operate in Illinois

Illinois had 2,200 computer systems design services firms in 2023, according to Census County Business Patterns (NAICS 541512, Computer Systems Design Services). They employed 27,597 people in mid-March and reported $3.7 billion in annual payroll. That is the 9th highest count among the 51 states and DC with published figures. Computer systems design services firms make up 0.68% of the 322,415 business establishments in the state.

Per 100,000 residents (2024 estimate) Illinois has 17.3 computer systems design services firms, in line with the national rate of 17.1. The average establishment has 12.5 employees against 13.2 nationally. Payroll per employee is $135,802, 11.2% above the U.S. figure of $122,171.

Illinois's largest markets for computer systems design services firms

Census published IT services firm counts for 17 metro or micropolitan areas that include part of Illinois. The largest is Chicago, IL-IN, with 2,009 establishments (a multi-state area; its count covers every state it spans). Single-state metro and micropolitan areas account for 5.8% of the statewide total; the rest are outside any published area or in areas Census suppressed.

Team sizes at computer systems design services firms in Illinois

75.2% of Illinois's computer systems design services firms with employees had fewer than five people in March 2023, compared with 74.5% nationally. 85.5% had fewer than ten. That is the size of team where a missed call usually means nobody was free, not that nobody was on staff.

Calls an IT services firm in Illinois has to catch

Managed IT and systems integration firms field support calls that range from a forgotten password to a server outage. Clients judge them by how quickly someone answers when something breaks. That holds for computer systems design services firms in Illinois as much as anywhere.

Calls an IT services firm in Illinois might handle in a typical week include:

• A client calls because email is down for the whole office.
• A vendor calls about a hardware order.
• A user calls to reset a password.

After-hours calls

Outages do not keep business hours, so routing urgent after-hours calls to an on-call technician is common.

Callata voicemail is transcribed and triaged for urgency, and business-hours routing decides where calls go once you close.

Phone system pricing for a 13-person IT services firm

Computer systems design services firms in Illinois average 12.5 employees, so the comparison uses a 13-person team. On a per-user plan that headcount sets the bill: $324.35 a month on Ooma Office Pro or $390.00 on RingCentral RingEX Core at list price (checked September 28, 2026). On Callata the same 13 people cost $259.00 a month, less than either per-seat plan.

The annual difference against RingCentral's monthly list price comes to $1,572. Some vendors discount annual contracts; the table shows month-to-month prices.

Area codes in Illinois

Illinois has 17 geographic area codes in service according to NANPA. You can choose local numbers in the area codes your clients know, subject to carrier inventory, or port your current number for free.

How Callata works for computer systems design services firms in Illinois

Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.

If you already have a number in Illinois, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.

Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.