CallataGuidesGet a local business phone number in Union City, MI
Union City's area code, prefixes and carriers from NANPA records, and how to put a Union City number in front of your customers.
- Area code
- 517
- Exchanges
- 2NANPA-assigned
- Carriers
- 2
- Population
- 1,730Census 2024 est.
Union City area codes
With 1,730 residents in the Census 2024 estimate, Union City sits in Branch County, Michigan. All 2 exchanges NANPA lists for its rate center are in area code 517. Union City is in the Eastern time zone.
According to NANPA's dialing-plan data, local calls within 517 are dialed as seven digits and toll calls as 1 plus ten digits.
| Area code | Exchanges here | Share | In service since | Overlay with | Time zone |
|---|---|---|---|---|---|
| 517 | 2 | 100% | 1947 | none | Eastern |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Union City exchanges by carrier
2 carriers hold the 2 exchanges assigned to Union City's rate center. Frontier North, INC. - Mi has the most, with 1. 2 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. The table counts codes by the operating company NANPA assigned them to, not by who serves each number today.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Frontier North, INC. - Mi | 1 | 50% |
| Level 3 Communications, LLC - Mi | 1 | 50% |
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.
Union City phone prefixes
These are the central office codes NANPA records for Union City. A caller seeing one of them recognizes a local number. The earliest assignment date recorded in the file for these codes is 2002. None were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 517 | 741, 756 |
Source: NANPA utilized central office code file.
What makes a number local to Union City
What a caller sees as "local" is the area code plus prefix. In Union City, those come from the UNION CITY rate center, as recorded by NANPA.
Keeping an existing Union City number costs nothing on Callata, because porting is free; a new number depends on what carriers have open in 517 when you pick it.
Businesses around Union City
Union City is part of the Coldwater, MI micropolitan area, home to 46,187 people in 2024. County Business Patterns counted 833 business establishments in the Coldwater, MI micropolitan area in 2023, employing 13,376 people. The largest sectors by establishment count are retail trade (143), other services (except public administration) (91), and health care and social assistance (89).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Full-service restaurants | 30 | 525 | 17.5 |
| Limited-service restaurants | 24 | 536 | 22.3 |
| Insurance agencies and brokerages | 18 | 106 | 5.9 |
| Physician practices | 16 | 128 | 8.0 |
| Plumbing, heating and air-conditioning contractors | 13 | 60 | 4.6 |
| Residential remodelers | 13 | 38 | 2.9 |
| Dental offices | 12 | 110 | 9.2 |
| Site preparation contractors | 11 | 68 | 6.2 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
A Union City number on Callata
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 Union 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.
A 16-person team is the benchmark here, the rounded average establishment size in the Coldwater, MI micropolitan area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $480.00 a month and Ooma Office Pro $399.20. On Callata the same 16 people cost $319.00 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 | $319.00 | $3,828.00 |
| Quo (Starter) | $19.00 per user | $304.00 | $3,648.00 |
| Nextiva (Core) | $23.00 per user | $368.00 | $4,416.00 |
| Ooma (Office Pro) | $24.95 per user | $399.20 | $4,790.40 |
| Dialpad (Standard) | $27.00 per user | $432.00 | $5,184.00 |
| RingCentral (RingEX Core) | $30.00 per user | $480.00 | $5,760.00 |
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 Union City, MI?
517. All exchanges NANPA lists for Union City are in 517.
How many phone companies have exchanges in Union City?
2, holding 2 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Union 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 Union City?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 16 users come to $319.00 a month. For comparison, 16 users on RingCentral RingEX Core list at $480.00 a month (checked September 28, 2026).