CallataGuidesBusiness phone system for offices of certified public accountants in St. Louis, MO-IL
Offices of certified public accountants in the St. Louis, MO-IL metro area: 419 establishments in 2023, the local area codes, and what phone service costs a 14-person team.
- Establishments
- 419CBP 2023
- Employees
- 5,886mid-March 2023
- Per 100k residents
- 14.9U.S. 16.2
- Rank
- 25th of 864areas by count
How many offices of certified public accountants are in St. Louis, MO-IL?
There were 419 offices of certified public accountants in the St. Louis, MO-IL metro area in 2023, according to Census County Business Patterns (NAICS 541211, Offices of Certified Public Accountants). They employed 5,886 people in mid-March and paid $519.5 million in annual payroll. By establishment count the area is 25th out of 864 areas with published figures for offices of certified public accountants.
Measured against its 2.8 million residents (2024 estimate), the area has 14.9 offices of certified public accountants per 100,000 people; the U.S. rate is 16.2, so St. Louis, MO-IL is 7.9% below the national figure. The average establishment here has 14.0 employees, compared with 11.0 nationally. Payroll per employee comes to $88,262, 12.3% below the national $100,691.
| Measure | St. Louis, MO-IL | Missouri | United States |
|---|---|---|---|
| Establishments | 419 | 869 | 55,052 |
| Mid-March employees | 5,886 | 12,000 | 604,209 |
| Annual payroll | $519,510,000 | $962,174,000 | $60,838,681,000 |
| Employees per establishment | 14.0 | 13.8 | 11.0 |
| Payroll per employee | $88,262 | $80,181 | $100,691 |
| Establishments per 100,000 residents | 14.9 | 13.9 | 16.2 |
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.
Team sizes at offices of certified public accountants in St. Louis, MO-IL
Of the offices of certified public accountants in St. Louis, MO-IL that had employees in March 2023, 57.9% had fewer than five (the U.S. share is 64.8%). 80.1% 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 | 242 | 57.9% | 64.8% |
| 5–9 employees | 93 | 22.2% | 18.8% |
| 10–19 employees | 40 | 9.6% | 9.2% |
| 20–49 employees | 27 | 6.5% | 4.3% |
| 50 or more employees | 16 | 3.8% | 2.9% |
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.
Why the phone matters for offices of certified public accountants in St. Louis, MO-IL
CPA firms see sharp call peaks around filing deadlines, when the same small staff answers questions from many clients at once. Capturing every call and routing it to the right preparer keeps deadline weeks manageable. That holds for offices of certified public accountants in St. Louis, MO-IL as much as anywhere.
Typical inbound and outbound calls for offices of certified public accountants in St. Louis, MO-IL:
- A small business owner calls to ask about bookkeeping help.
- The firm calls a client to request a signature.
- A client calls to ask whether a missing tax form has been received.
Business texting for offices of certified public accountants
Firms text document reminders and let clients know when returns are ready to sign.
Texts sent from a local business number in St. Louis, MO-IL have to be registered with carriers first (10DLC); on Callata that is a one-time $49 fee, after which the whole team can text from the shared number.
What a phone system costs an accounting firm in St. Louis, MO-IL
The average accounting firm in St. Louis, MO-IL has 14.0 employees, so a 14-person team is a reasonable benchmark. On a per-user plan that headcount sets the bill: $349.30 a month on Ooma Office Pro or $420.00 on RingCentral RingEX Core at list price (checked September 28, 2026). Callata comes to $279.00 a month for 14 users ($99 a month with 5 users included, then $20 per additional user), below both.
Over a year, that is $1,692 less than RingCentral for an accounting firm in St. Louis, MO-IL of that size. Annual contracts lower some competitors' prices, so compare the plan you would actually sign.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $279.00 | $3,348.00 |
| Quo (Starter) | $19.00 per user | $266.00 | $3,192.00 |
| Nextiva (Core) | $23.00 per user | $322.00 | $3,864.00 |
| Ooma (Office Pro) | $24.95 per user | $349.30 | $4,191.60 |
| Dialpad (Standard) | $27.00 per user | $378.00 | $4,536.00 |
| RingCentral (RingEX Core) | $30.00 per user | $420.00 | $5,040.00 |
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.
Local area codes for offices of certified public accountants 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%). A local number lets clients in St. Louis, MO-IL call without dialing out of area. Callata includes up to 3 local numbers, and which numbers are open in an area code depends on carrier inventory when you choose.
| 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.
Setting up Callata for an accounting firm in St. Louis, MO-IL
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.
Porting a number you already use in St. Louis, MO-IL is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.
AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.
Avoid sending taxpayer identification numbers or full financial details by text.
Frequently asked questions
How many offices of certified public accountants are there in St. Louis, MO-IL?
Census County Business Patterns counted 419 offices of certified public accountants in the St. Louis, MO-IL metro area in 2023. They employed 5,886 people in mid-March.
What does a business phone system cost for a 14-person accounting firm?
At month-to-month list prices checked September 28, 2026, 14 users cost $420.00 a month on RingCentral RingEX Core and $349.30 on Ooma Office Pro. On Callata, $99 a month with 5 users included, then $20 per additional user, the same team pays $279.00.
What area code should an accounting 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 accounting 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. Avoid sending taxpayer identification numbers or full financial details by text.