CallataGuidesGet a local business phone number in Casa Grande, AZ
Casa Grande's area code, prefixes and carriers from NANPA records, and how to put a Casa Grande number in front of your customers.
- Area code
- 520
- Exchanges
- 67NANPA-assigned
- Carriers
- 13
- Population
- 68,927Census 2024 est.
Casa Grande area codes
Casa Grande city is a Census place in Pinal County, Arizona, with an estimated 68,927 residents in 2024. All 67 exchanges NANPA lists for its rate center are in area code 520. Casa Grande is in the Mountain time zone.
According to NANPA's dialing-plan data, local calls within 520 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 |
|---|---|---|---|---|---|
| 520 | 67 | 100% | 1995 | none | Mountain |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Who holds Casa Grande phone exchanges
13 carriers hold the 67 exchanges assigned to Casa Grande's rate center. T-mobile USA, INC. has the most, with 18. 55 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 |
|---|---|---|
| T-mobile USA, INC. | 18 | 27% |
| Qwest Corporation | 18 | 27% |
| Cellco Partnership d/b/a Verizon Wireless - Az | 8 | 12% |
| New Cingular Wireless PCS, LLC | 7 | 10% |
| Level 3 Communications, LLC - Az | 4 | 6.0% |
| Onvoy, LLC - Az | 4 | 6.0% |
| Metropcs, INC. | 2 | 3.0% |
| Gila Local Exchange Carrier, INC. - Az | 1 | 1.5% |
| Electric Lightwave LLC d/b/a Allstream | 1 | 1.5% |
| Commio, LLC | 1 | 1.5% |
| Level 3 Telecom of Arizona, LLC - Az | 1 | 1.5% |
| Boost Subscriberco L.l.c. | 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.
Casa Grande phone prefixes
A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Casa Grande. The earliest assignment date recorded in the file for these codes is 2001. 21 of the 67 were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 520 | 208, 213, 217, 233, 251, 252, 280, 316, 340, 350, 371, 374, 380, 381, 413, 414, 421, 423, 424, 426, 431, 450, 464, 466, 472, 483, 494, 509, 510, 518, 532, 553, 557, 560, 568, 582, 598, 607, 632, 634, 635, 637, 660, 666, 677, 683, 688, 701, 705, 709, 723, 728, 736, 752, 757, 759, 763, 764, 765, 767, 788, 836, 840, 858, 866, 868, 876 |
Source: NANPA utilized central office code file.
When Casa Grande's exchanges were assigned
The table groups Casa Grande's exchanges by the decade NANPA recorded them as assigned.
| Decade assigned | Exchanges | Share |
|---|---|---|
| 2000s | 7 | 19% |
| 2010s | 9 | 24% |
| 2020s | 21 | 57% |
Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.
Rate centers and local calling in Casa Grande
Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. Casa Grande's numbers are rated to the CASAGRANDE rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a Casa Grande number.
Keeping an existing Casa Grande number costs nothing on Callata, because porting is free; a new number depends on what carriers have open in 520 when you pick it.
Businesses around Casa Grande
Casa Grande is part of the Phoenix-Mesa-Chandler, AZ metro area, home to 5.2 million people in 2024. County Business Patterns counted 114,586 business establishments in the Phoenix, AZ metro area in 2023, employing 2,080,244 people. The largest sectors by establishment count are health care and social assistance (16,243), professional, scientific, and technical services (15,942), and retail trade (11,620).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Offices of real estate agents and brokers | 4,760 | 10,041 | 2.1 |
| Limited-service restaurants | 4,054 | 86,592 | 21.4 |
| Physician practices | 3,683 | 38,075 | 10.3 |
| Full-service restaurants | 2,902 | 81,960 | 28.2 |
| Law offices | 2,339 | 14,252 | 6.1 |
| Dental offices | 2,198 | 15,663 | 7.1 |
| Insurance agencies and brokerages | 2,076 | 11,001 | 5.3 |
| Management consulting firms | 2,042 | 14,689 | 7.2 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Setting up a Casa Grande business line
For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.
Porting a number you already use in Casa Grande 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.
The comparison below uses 18 users, the rounded average establishment size in the Phoenix, AZ metro area. At list prices checked September 28, 2026, that is $449.10 a month on Ooma Office Pro and $540.00 on RingCentral RingEX Core. Callata comes to $359.00 a month for 18 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 | $359.00 | $4,308.00 |
| Quo (Starter) | $19.00 per user | $342.00 | $4,104.00 |
| Nextiva (Core) | $23.00 per user | $414.00 | $4,968.00 |
| Ooma (Office Pro) | $24.95 per user | $449.10 | $5,389.20 |
| Dialpad (Standard) | $27.00 per user | $486.00 | $5,832.00 |
| RingCentral (RingEX Core) | $30.00 per user | $540.00 | $6,480.00 |
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 Casa Grande, AZ?
520. All exchanges NANPA lists for Casa Grande are in 520.
How many phone companies have exchanges in Casa Grande?
13, holding 67 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Casa Grande 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 Casa Grande?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 18 users come to $359.00 a month. For comparison, 18 users on RingCentral RingEX Core list at $540.00 a month (checked September 28, 2026).