CallataGuidesBusiness phone system for engineering services firms in Knoxville, TN
Engineering services firms in the Knoxville, TN metro area: 198 establishments in 2023, the local area codes, and what phone service costs a 21-person team.
- Establishments
- 198CBP 2023
- Employees
- 4,246mid-March 2023
- Per 100k residents
- 20.7U.S. 18.6
- Rank
- 65th of 735areas by count
The engineering firm market in Knoxville, TN
County Business Patterns counts 198 engineering services firms (NAICS 541330, Engineering Services) in the Knoxville, TN metro area for 2023. They employed 4,246 people in mid-March and paid $546.8 million in annual payroll. By establishment count the area is 65th out of 735 areas with published figures for engineering services firms.
Measured against its 958,000 residents (2024 estimate), the area has 20.7 engineering services firms per 100,000 people; the U.S. rate is 18.6, so Knoxville, TN is 11.2% above the national figure. The average establishment here has 21.4 employees, compared with 19.9 nationally. Payroll per employee comes to $128,789, 17.1% above the national $109,949.
| Measure | Knoxville, TN | Tennessee | United States |
|---|---|---|---|
| Establishments | 198 | 855 | 63,233 |
| Mid-March employees | 4,246 | 17,513 | 1,260,577 |
| Annual payroll | $546,840,000 | $1,811,157,000 | $138,599,619,000 |
| Employees per establishment | 21.4 | 20.5 | 19.9 |
| Payroll per employee | $128,789 | $103,418 | $109,949 |
| Establishments per 100,000 residents | 20.7 | 11.8 | 18.6 |
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.
Establishment size: engineering services firms in Knoxville, TN
Of the engineering services firms in Knoxville, TN that had employees in March 2023, 48.0% had fewer than five (the U.S. share is 53.1%). 66.3% had fewer than ten. For a business of a few people, phone coverage is a staffing question as much as a technology one: someone has to be free to pick up, or the call needs somewhere sensible to go.
| Employment size | Establishments | Share | U.S. share |
|---|---|---|---|
| 1–4 employees | 94 | 48.0% | 53.1% |
| 5–9 employees | 36 | 18.4% | 15.0% |
| 10–19 employees | 16 | 8.2% | 13.1% |
| 20–49 employees | 29 | 14.8% | 11.3% |
| 50 or more employees | 21 | 10.7% | 7.6% |
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.
Calls an engineering firm in Knoxville, TN has to catch
Engineering firms handle client calls, contractor questions and agency coordination, often while staff are in the field. Routing calls to the right project engineer saves time on every project.
A few of the calls that come in to engineering services firms in Knoxville, TN:
- A homeowner calls about a structural inspection.
- A municipal reviewer calls about comments.
- A contractor calls with a field question.
Texting clients
Firms text site meeting times and document notifications.
Team texting on Callata runs from your business number, so replies come from the practice or shop rather than someone's personal phone. It turns on after the one-time $49 carrier registration (10DLC) is approved.
Phone system pricing for a 21-person engineering firm
The average engineering firm in Knoxville, TN has 21.4 employees, so a 21-person team is a reasonable benchmark. On a per-user plan that headcount sets the bill: $523.95 a month on Ooma Office Pro or $630.00 on RingCentral RingEX Core at list price (checked September 28, 2026). Callata comes to $419.00 a month for 21 users ($99 a month with 5 users included, then $20 per additional user), below both.
Over a year, that is $2,532 less than RingCentral for an engineering firm in Knoxville, TN 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 | $419.00 | $5,028.00 |
| Quo (Starter) | $19.00 per user | $399.00 | $4,788.00 |
| Nextiva (Core) | $23.00 per user | $483.00 | $5,796.00 |
| Ooma (Office Pro) | $24.95 per user | $523.95 | $6,287.40 |
| Dialpad (Standard) | $27.00 per user | $567.00 | $6,804.00 |
| RingCentral (RingEX Core) | $30.00 per user | $630.00 | $7,560.00 |
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 Knoxville, TN
NANPA records place the exchanges of the area's named cities and towns in 2 area codes. 865 has the most, with 409 of 436 exchanges (94%). A local number lets clients in Knoxville, TN 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 |
|---|---|---|---|---|
| 865 | 409 | Eastern | 1999 | none |
| 423 | 27 | Eastern and Central | 1995 | 729 |
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.
How Callata works for engineering services firms
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.
Porting a number you already use in Knoxville, TN 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.
Frequently asked questions
How many engineering services firms are there in Knoxville, TN?
Census County Business Patterns counted 198 engineering services firms in the Knoxville, TN metro area in 2023. They employed 4,246 people in mid-March.
What does a business phone system cost for a 21-person engineering firm?
At month-to-month list prices checked September 28, 2026, 21 users cost $630.00 a month on RingCentral RingEX Core and $523.95 on Ooma Office Pro. On Callata, $99 a month with 5 users included, then $20 per additional user, the same team pays $419.00.
What area code should an engineering firm in Knoxville, TN use?
Area code 865 has the most assigned exchanges among the area's named places, followed by 423. If you already have a local number, you can port it to Callata for free.
Can an AI receptionist answer calls for an engineering 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.