CallataGuidesBusiness phone system for computer systems design services firms in St. Louis, MO-IL
Computer systems design services firms in the St. Louis, MO-IL metro area: 405 establishments in 2023, the local area codes, and what phone service costs a 13-person team.
- Establishments
- 405CBP 2023
- Employees
- 5,457mid-March 2023
- Per 100k residents
- 14.4U.S. 17.1
- Rank
- 28th of 577areas by count
The IT services firm market in St. Louis, MO-IL
There were 405 computer systems design services firms in the St. Louis, MO-IL metro area in 2023, according to Census County Business Patterns (NAICS 541512, Computer Systems Design Services). Together they reported 5,457 mid-March employees and $533.7 million of payroll for the year. That ranks 28th of the 577 metro and micropolitan areas where Census published a count for this industry.
With 2.8 million residents in the Census 2024 estimate, that is 14.4 computer systems design services firms per 100,000 people, 15.7% below the national rate of 17.1. Establishments average 13.5 employees, 2.2% above the U.S. average of 13.2. Payroll per employee comes to $97,807, 19.9% below the national $122,171.
| Measure | St. Louis, MO-IL | Missouri | United States |
|---|---|---|---|
| Establishments | 405 | 689 | 58,113 |
| Mid-March employees | 5,457 | 23,839 (moderate noise) | 766,160 |
| Annual payroll | $533,734,000 | $2,349,556,000 (moderate noise) | $93,602,442,000 |
| Employees per establishment | 13.5 | 34.6 | 13.2 |
| Payroll per employee | $97,807 | $98,559 | $122,171 |
| Establishments per 100,000 residents | 14.4 | 11.0 | 17.1 |
Census County Business Patterns 2023 (mid-March employment; annual payroll). Employees and payroll flagged high-noise are shown but not used in the text. Residents: Census Vintage 2024 estimates.
How big computer systems design services firms in St. Louis, MO-IL are
Of the computer systems design services firms in St. Louis, MO-IL that had employees in March 2023, 68.9% had fewer than five (the U.S. share is 74.5%). 81.6% had fewer than ten. When a business has only a few people, whoever is free answers the phone, and calls that arrive while everyone is busy go to voicemail unless they are routed somewhere else.
| Employment size | Establishments | Share | U.S. share |
|---|---|---|---|
| 1–4 employees | 277 | 68.9% | 74.5% |
| 5–9 employees | 51 | 12.7% | 9.7% |
| 10–19 employees | 27 | 6.7% | 6.5% |
| 20–49 employees | 31 | 7.7% | 5.0% |
| 50 or more employees | 16 | 4.0% | 4.4% |
Employment-size classes count establishments by mid-March 2023 employment. Establishments with no March employees are excluded from the size classes, so shares are of establishments with employees. Source: Census County Business Patterns 2023.
What computer systems design services firms in St. Louis, MO-IL use the phone for
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.
Typical inbound and outbound calls for computer systems design services firms in St. Louis, MO-IL:
- A prospect calls to ask about managed IT.
- A vendor calls about a hardware order.
- A client calls because email is down for the whole office.
After-hours calls
Outages do not keep business hours, so routing urgent after-hours calls to an on-call technician is common.
Callata transcribes voicemail and triages it for urgency, so the first callback in the morning can go to the caller who needs it most.
Phone system pricing for a 13-person IT services firm
The average IT services firm in St. Louis, MO-IL has 13.5 employees, so a 13-person team is a reasonable benchmark. Per-seat business phone plans bill every one of those people. At month-to-month list prices checked September 28, 2026, 13 users on RingCentral RingEX Core cost $390.00 a month and 13 on Ooma Office Pro cost $324.35. 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.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $259.00 | $3,108.00 |
| Quo (Starter) | $19.00 per user | $247.00 | $2,964.00 |
| Nextiva (Core) | $23.00 per user | $299.00 | $3,588.00 |
| Ooma (Office Pro) | $24.95 per user | $324.35 | $3,892.20 |
| Dialpad (Standard) | $27.00 per user | $351.00 | $4,212.00 |
| RingCentral (RingEX Core) | $30.00 per user | $390.00 | $4,680.00 |
Competitor prices are each vendor's published month-to-month list price per user for its lowest plan that includes business calling and texting, checked September 28, 2026: Quo Starter $19, Nextiva Core $23, Ooma Office Pro $24.95 (Essentials excludes texting; one-time $29.95 activation not included), Dialpad Standard $27, RingCentral RingEX Core $30 ($20 billed annually). Prices exclude taxes and fees and may change; annual contracts lower some competitors' prices.
Which area code to use in St. Louis, MO-IL
NANPA records place the exchanges of the area's named cities and towns in 8 area codes. 314 has the most, with 723 of 1,483 exchanges (49%). Callata's plan includes up to 3 local numbers; you can pick them in the area codes your clients recognize, subject to carrier inventory, or port the number you already have for free.
| Area code | Exchanges | Time zone | In service since | Overlay with |
|---|---|---|---|---|
| 314 | 723 | Central | 1947 | 557 |
| 618 | 324 | Central | 1947 | 730 |
| 636 | 308 | Central | 1999 | none |
| 557 | 71 | Central | 2022 | 314 |
| 730 | 30 | Central | 2023 | 618 |
| 217 | 14 | Central | 1947 | 447 |
| 573 | 11 | Central | 1996 | 235 |
| 447 | 2 | Central | 2021 | 217 |
Exchanges are NANPA-assigned central office codes (NPA-NXX) in the rate centers matched to the area's named places. Source: NANPA utilized code and NPA reports.
What computer systems design services firms in St. Louis, MO-IL get with Callata
For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.
If you already have a number in St. Louis, MO-IL, 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.
Frequently asked questions
How many computer systems design services firms are there in St. Louis, MO-IL?
Census County Business Patterns counted 405 computer systems design services firms in the St. Louis, MO-IL metro area in 2023. They employed 5,457 people in mid-March.
What does a business phone system cost for a 13-person IT services firm?
At month-to-month list prices checked September 28, 2026, 13 users cost $390.00 a month on RingCentral RingEX Core and $324.35 on Ooma Office Pro. On Callata, $99 a month with 5 users included, then $20 per additional user, the same team pays $259.00.
What area code should an IT services firm in St. Louis, MO-IL use?
Area code 314 has the most assigned exchanges among the area's named places, followed by 618 and 636. If you already have a local number, you can port it to Callata for free.
Can an AI receptionist answer calls for an IT services firm?
Yes. Callata's optional AI agents can answer when the team is busy or closed, take a message, text, email or transfer the call. They disclose that they are AI and are billed from prepaid AI minutes at $0.25 per minute.