CallataGuidesGet a local business phone number in Oak Ridge, TN
Oak Ridge's area code, prefixes and carriers from NANPA records, and how to put a Oak Ridge number in front of your customers.
- Area code
- 865
- Exchanges
- 21NANPA-assigned
- Carriers
- 6
- Population
- 34,039Census 2024 est.
Area codes in Oak Ridge
Oak Ridge, in Anderson County, Tennessee, had a Census-estimated population of 34,039 in July 2024. All 21 exchanges NANPA lists for its rate center are in area code 865. Oak Ridge is in the Eastern time zone.
According to NANPA's dialing-plan data, local calls within 865 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.
| Area code | Exchanges here | Share | In service since | Overlay with | Time zone |
|---|---|---|---|---|---|
| 865 | 21 | 100% | 1999 | none | Eastern |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Phone carriers in Oak Ridge
6 carriers hold the 21 exchanges assigned to Oak Ridge's rate center. Bellsouth Telecomm INC d/b/a South Central Bell Tel has the most, with 6. 14 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. Holding a code means NANPA assigned that block of numbers to the carrier for this rate center; individual numbers may since have been ported elsewhere.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Bellsouth Telecomm INC d/b/a South Central Bell Tel | 6 | 29% |
| Teleport Communications America, LLC - TN | 6 | 29% |
| Paetec Itel, LLC | 3 | 14% |
| Mcimetro Access Transmission Services LLC - TN | 3 | 14% |
| Level 3 Communications, LLC - TN | 2 | 9.5% |
| Intrado Communications, LLC | 1 | 4.8% |
Carrier names are the operating company (OCN) names on NANPA's utilized central office code file dated 10/01/2026. A carrier holding a code may port numbers to other carriers.
Exchanges (NPA-NXX) assigned in Oak Ridge
These are the central office codes NANPA records for Oak Ridge. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2001. 3 of the 21 were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 865 | 220, 241, 272, 275, 276, 294, 298, 303, 341, 425, 434, 481, 482, 483, 515, 535, 574, 576, 685, 813, 835 |
Source: NANPA utilized central office code file.
When Oak Ridge's exchanges were assigned
Assignment dates show when each block of Oak Ridge numbers was added to the local supply.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2000s | 4 | 50% |
| 2010s | 1 | 13% |
| 2020s | 3 | 38% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
How local numbers work in Oak Ridge
Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. Oak Ridge's numbers are rated to the OAK RIDGE rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a Oak Ridge number.
New local numbers are drawn from carrier inventory, so the exact 865 numbers available change over time; porting an existing number is free.
The local business market
Oak Ridge is part of the Knoxville, TN metro area, home to 958,000 people in 2024. County Business Patterns counted 19,652 business establishments in the Knoxville, TN metro area in 2023, employing 385,052 people. The largest sectors by establishment count are retail trade (2,994), health care and social assistance (2,352), and other services (except public administration) (2,154).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Limited-service restaurants | 728 | 17,042 | 23.4 |
| Physician practices | 590 | 9,011 | 15.3 |
| Full-service restaurants | 578 | 16,572 | 28.7 |
| Insurance agencies and brokerages | 340 | 2,058 | 6.1 |
| Law offices | 314 | 1,748 | 5.6 |
| Landscaping services | 312 | 2,557 | 8.2 |
| Dental offices | 304 | 2,436 | 8.0 |
| Plumbing, heating and air-conditioning contractors | 275 | 3,649 | 13.3 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Business phone service in Oak Ridge
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 Oak Ridge, 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.
Per-seat phone plans multiply by headcount. For the rounded average establishment size in the Knoxville, TN metro area, 20 users on RingCentral RingEX Core come to $600.00 a month and on Ooma Office Pro $499.00, at month-to-month list prices checked September 28, 2026. On Callata the same 20 people cost $399.00 a month, less than either per-seat plan.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $399.00 | $4,788.00 |
| Quo (Starter) | $19.00 per user | $380.00 | $4,560.00 |
| Nextiva (Core) | $23.00 per user | $460.00 | $5,520.00 |
| Ooma (Office Pro) | $24.95 per user | $499.00 | $5,988.00 |
| Dialpad (Standard) | $27.00 per user | $540.00 | $6,480.00 |
| RingCentral (RingEX Core) | $30.00 per user | $600.00 | $7,200.00 |
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.
Frequently asked questions
What area code is Oak Ridge, TN?
865. All exchanges NANPA lists for Oak Ridge are in 865.
How many phone companies have exchanges in Oak Ridge?
6, holding 21 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Oak Ridge business number?
Yes. Porting an existing number to Callata is free. Texting from it starts after carrier registration (10DLC), a one-time $49 fee.
How much is a business phone line in Oak Ridge?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 20 users come to $399.00 a month. For comparison, 20 users on RingCentral RingEX Core list at $600.00 a month (checked September 28, 2026).