CallataGuidesGet a local business phone number in Johnson City, TN
Johnson City's area code, prefixes and carriers from NANPA records, and how to put a Johnson City number in front of your customers.
- Area code
- 423
- Exchanges
- 67NANPA-assigned
- Carriers
- 29
- Population
- 73,635Census 2024 est.
Johnson City area codes
With 73,635 residents in the Census 2024 estimate, Johnson City sits in Washington County, Tennessee. All 67 exchanges NANPA lists for its rate center are in area code 423. 423 is part of an overlay with 729, so a new local number in Johnson City may carry any of those codes depending on which have numbers available. Johnson City is in the Eastern and Central time zone.
According to NANPA's dialing-plan data, local calls within 423 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 |
|---|---|---|---|---|---|
| 423 | 67 | 100% | 1995 | 729 | Eastern and Central |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Phone carriers in Johnson City
29 carriers hold the 67 exchanges assigned to Johnson City's rate center. United Telephone-southeast-tn d/b/a Centurylink - TN has the most, with 21. 46 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 |
|---|---|---|
| United Telephone-southeast-tn d/b/a Centurylink - TN | 21 | 31% |
| Suncom d/b/a T-mobile USA | 7 | 10% |
| New Cingular Wireless PCS, LLC - Ga | 6 | 9.0% |
| Onvoy, LLC - TN | 3 | 4.5% |
| Nuso, LLC | 3 | 4.5% |
| Level 3 Communications, LLC - TN | 2 | 3.0% |
| Spok, INC. | 2 | 3.0% |
| Paetec Itel, LLC | 2 | 3.0% |
| Mcimetro Access Transmission Services LLC - TN | 1 | 1.5% |
| Pro Page Partners, LLC | 1 | 1.5% |
| Bandwidth.com CLEC, LLC - TN | 1 | 1.5% |
| Comcast Ip Phone, LLC | 1 | 1.5% |
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 Johnson City
These are the central office codes NANPA records for Johnson City. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2001. 14 of the 67 were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 423 | 202, 218, 232, 233, 262, 268, 282, 283, 302, 328, 410, 412, 427, 430, 431, 433, 434, 439, 461, 483, 491, 524, 549, 557, 610, 630, 631, 656, 670, 672, 673, 676, 705, 722, 737, 741, 747, 767, 773, 791, 794, 795, 796, 833, 848, 849, 853, 854, 880, 900, 905, 906, 915, 924, 926, 928, 929, 930, 938, 943, 946, 952, 953, 975, 979, 981, 995 |
Source: NANPA utilized central office code file.
When Johnson City's exchanges were assigned
Assignment dates show when each block of Johnson City numbers was added to the local supply.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2000s | 13 | 37% |
| 2010s | 8 | 23% |
| 2020s | 14 | 40% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
How local numbers work in Johnson City
Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. Johnson City's numbers are rated to the JOHNSON CY rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a Johnson City number.
If your business already has a Johnson City number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
The local business market
Johnson City is part of the Johnson City, TN metro area, home to 215,000 people in 2024. County Business Patterns counted 4,070 business establishments in the Johnson City, TN metro area in 2023, employing 69,452 people. The largest sectors by establishment count are retail trade (717), health care and social assistance (535), and other services (except public administration) (500).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Limited-service restaurants | 178 | 4,440 | 24.9 |
| Full-service restaurants | 156 | 3,646 | 23.4 |
| Physician practices | 149 | 2,128 | 14.3 |
| Insurance agencies and brokerages | 75 | 492 | 6.6 |
| Landscaping services | 68 | 306 | 4.5 |
| Dental offices | 65 | 566 | 8.7 |
| Residential remodelers | 60 | 204 | 3.4 |
| Plumbing, heating and air-conditioning contractors | 54 | 391 | 7.2 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Setting up a Johnson City business line
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 Johnson City, 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.
The comparison below uses 17 users, the rounded average establishment size in the Johnson City, TN metro area. At list prices checked September 28, 2026, that is $424.15 a month on Ooma Office Pro and $510.00 on RingCentral RingEX Core. On Callata the same 17 people cost $339.00 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 | $339.00 | $4,068.00 |
| Quo (Starter) | $19.00 per user | $323.00 | $3,876.00 |
| Nextiva (Core) | $23.00 per user | $391.00 | $4,692.00 |
| Ooma (Office Pro) | $24.95 per user | $424.15 | $5,089.80 |
| Dialpad (Standard) | $27.00 per user | $459.00 | $5,508.00 |
| RingCentral (RingEX Core) | $30.00 per user | $510.00 | $6,120.00 |
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 Johnson City, TN?
423. All exchanges NANPA lists for Johnson City are in 423.
How many phone companies have exchanges in Johnson City?
29, holding 67 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Johnson City 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 Johnson City?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 17 users come to $339.00 a month. For comparison, 17 users on RingCentral RingEX Core list at $510.00 a month (checked September 28, 2026).