CallataGuidesGet a local business phone number in Theresa, NY
Theresa's area codes, prefixes and carriers from NANPA records, and how to put a Theresa number in front of your customers.
- Area code
- 315 / 680
- Exchanges
- 3NANPA-assigned
- Carriers
- 3
- Population
- 2,622Census 2024 est.
What area code is Theresa, NY?
Theresa town is a Census town in Jefferson County, New York, with an estimated 2,622 residents in 2024. NANPA lists 3 exchanges for its rate center across 2 area codes; 315 has the most (2, 67%). 315 is part of an overlay with 680, so a new local number in Theresa may carry any of those codes depending on which have numbers available. Theresa is in the Eastern time zone.
According to NANPA's dialing-plan data, local calls within 315 are dialed as ten digits (area code plus number) and toll calls as ten digits (area code plus number).
Phone carriers in Theresa
3 carriers hold the 3 exchanges assigned to Theresa's rate center. Verizon New York, INC. has the most, with 1. 3 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in Theresa can come from any of these blocks; once it is yours, porting lets it move between providers.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Verizon New York, INC. | 1 | 33% |
| Centurylink Communications, LLC | 1 | 33% |
| Fractel, LLC | 1 | 33% |
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.
Local prefixes for Theresa
These are the central office codes NANPA records for Theresa. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2016. 1 of the 3 were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 315 | 628, 819 |
| 680 | 388 |
Source: NANPA utilized central office code file.
When Theresa's exchanges were assigned
The table groups Theresa's exchanges by the decade NANPA recorded them as assigned.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2010s | 1 | 50% |
| 2020s | 1 | 50% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
Rate centers and local calling in Theresa
What a caller sees as "local" is the area code plus prefix. In Theresa, those come from the THERESA rate center, as recorded by NANPA.
If your business already has a Theresa number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
Businesses around Theresa
Theresa is part of the Watertown-Fort Drum, NY metro area, home to 113,000 people in 2024. County Business Patterns counted 2,348 business establishments in the Watertown, NY metro area in 2023, employing 28,622 people. The largest sectors by establishment count are retail trade (422), accommodation and food services (307), and construction (264).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Full-service restaurants | 111 | 1,415 | 12.7 |
| Limited-service restaurants | 88 | 1,590 | 18.1 |
| Residential remodelers | 61 | — | — |
| Physician practices | 48 | 572 | 11.9 |
| Landscaping services | 35 | 80 | 2.3 |
| Insurance agencies and brokerages | 33 | 246 | 7.5 |
| Hotels and motels | 33 | 523 | 15.8 |
| Dental offices | 31 | 350 | 11.3 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Setting up a Theresa 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.
Porting a number you already use in Theresa 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.
Per-seat phone plans multiply by headcount. For the rounded average establishment size in the Watertown, NY metro area, 12 users on RingCentral RingEX Core come to $360.00 a month and on Ooma Office Pro $299.40, at month-to-month list prices checked September 28, 2026. Callata comes to $239.00 a month for 12 users ($99 a month with 5 users included, then $20 per additional user), below both.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $239.00 | $2,868.00 |
| Quo (Starter) | $19.00 per user | $228.00 | $2,736.00 |
| Nextiva (Core) | $23.00 per user | $276.00 | $3,312.00 |
| Ooma (Office Pro) | $24.95 per user | $299.40 | $3,592.80 |
| Dialpad (Standard) | $27.00 per user | $324.00 | $3,888.00 |
| RingCentral (RingEX Core) | $30.00 per user | $360.00 | $4,320.00 |
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 Theresa, NY?
Theresa has exchanges in 315 and 680; 315 has the most.
How many phone companies have exchanges in Theresa?
3, holding 3 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Theresa 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 Theresa?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 12 users come to $239.00 a month. For comparison, 12 users on RingCentral RingEX Core list at $360.00 a month (checked September 28, 2026).