Business phone system for advertising agencies in Illinois

The advertising agency industry in Illinois

Illinois had 655 advertising agencies in 2023, according to Census County Business Patterns (NAICS 541810, Advertising Agencies). They employed 15,453 people in mid-March and reported $1.6 billion in annual payroll. That is the 5th highest count among the 51 states and DC with published figures. Advertising agencies make up 0.20% of the 322,415 business establishments in the state.

Per 100,000 residents (2024 estimate) Illinois has 5.2 advertising agencies, 13.0% above the national rate of 4.6. The average establishment has 23.6 employees against 12.9 nationally. Payroll per employee is $102,527, 4.0% below the U.S. figure of $106,841.

Where advertising agencies in Illinois are concentrated

Census published advertising agency counts for 14 metro or micropolitan areas that include part of Illinois. The largest is Chicago, IL-IN, with 595 establishments (a multi-state area; its count covers every state it spans). Single-state metro and micropolitan areas account for 8.9% of the statewide total; the rest are outside any published area or in areas Census suppressed.

Team sizes at advertising agencies in Illinois

60.2% of Illinois's advertising agencies with employees had fewer than five people in March 2023, compared with 68.2% nationally. 72.8% 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.

What advertising agencies in Illinois use the phone for

Agencies manage many client relationships at once, and clients expect to reach their account team quickly. Recording and summarizing calls helps teams keep track of approvals and requests.

Typical inbound and outbound calls for advertising agencies in Illinois:

• A prospect calls about agency services.
• A production vendor calls about a shoot.
• A media rep calls about an ad placement.

Calls after closing time

Launch-day issues can be urgent; otherwise after-hours calls can wait.

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

Callata vs. per-seat pricing for advertising agencies in Illinois

Advertising agencies in Illinois average 23.6 employees, so the comparison uses a 24-person team. On a per-user plan that headcount sets the bill: $598.80 a month on Ooma Office Pro or $720.00 on RingCentral RingEX Core at list price (checked September 28, 2026). On Callata the same 24 people cost $479.00 a month, less than either per-seat plan.

The annual difference against RingCentral's monthly list price comes to $2,892. 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 advertising agencies in Illinois

Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every 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.