CallataGuidesGet a local business phone number in California, MO
California's area code, prefixes and carriers from NANPA records, and how to put a California number in front of your customers.
- Area code
- 573
- Exchanges
- 4NANPA-assigned
- Carriers
- 4
- Population
- 4,522Census 2024 est.
Area codes in California
California, in Moniteau County, Missouri, had a Census-estimated population of 4,522 in July 2024. All 4 exchanges NANPA lists for its rate center are in area code 573. 573 is part of an overlay with 235, so a new local number in California may carry any of those codes depending on which have numbers available. California is in the Central time zone.
According to NANPA's dialing-plan data, local calls within 573 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 |
|---|---|---|---|---|---|
| 573 | 4 | 100% | 1996 | 235 | Central |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Who holds California phone exchanges
4 carriers hold the 4 exchanges assigned to California's rate center. Telnyx LLC 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 California can come from any of these blocks; once it is yours, porting lets it move between providers.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| Telnyx LLC | 1 | 25% |
| Level 3 Communications, LLC - Mo | 1 | 25% |
| Embarq Missouri, INC. d/b/a Centurylink - Mo | 1 | 25% |
| Onvoy, LLC - Mo | 1 | 25% |
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 California
Each prefix below is a block of up to 10,000 numbers that NANPA assigned to California's rate center (CALIFORNIA). The earliest assignment date recorded in the file for these codes is 2004. None were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 573 | 304, 464, 796, 863 |
Source: NANPA utilized central office code file.
How local numbers work in California
Phone numbers are tied to a rate center, the local calling area used to decide whether a call is local or toll. California's numbers are rated to the CALIFORNIA rate center in NANPA's records. A business number from one of the prefixes above shows up on customers' phones as a California number.
If your business already has a California number, porting it to Callata is free and keeps it on your cards, listings and vehicles.
The local business market
California is part of the Jefferson City, MO metro area, home to 152,000 people in 2024. County Business Patterns counted 3,606 business establishments in the Jefferson City, MO metro area in 2023, employing 55,768 people. The largest sectors by establishment count are retail trade (496), construction (480), and other services (except public administration) (458).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Limited-service restaurants | 106 | 2,512 | 23.7 |
| Full-service restaurants | 102 | 1,868 | 18.3 |
| Insurance agencies and brokerages | 84 | 475 | 5.7 |
| Landscaping services | 71 | 461 | 6.5 |
| Plumbing, heating and air-conditioning contractors | 70 | 878 | 12.5 |
| Law offices | 60 | 342 | 5.7 |
| Child day care services | 55 | 637 | 11.6 |
| Agencies providing services for the elderly and persons with disabilities | 47 | 531 | 11.3 |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Setting up a California 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 California, 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 15 users, the rounded average establishment size in the Jefferson City, MO metro area. At list prices checked September 28, 2026, that is $374.25 a month on Ooma Office Pro and $450.00 on RingCentral RingEX Core. On Callata the same 15 people cost $299.00 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 | $299.00 | $3,588.00 |
| Quo (Starter) | $19.00 per user | $285.00 | $3,420.00 |
| Nextiva (Core) | $23.00 per user | $345.00 | $4,140.00 |
| Ooma (Office Pro) | $24.95 per user | $374.25 | $4,491.00 |
| Dialpad (Standard) | $27.00 per user | $405.00 | $4,860.00 |
| RingCentral (RingEX Core) | $30.00 per user | $450.00 | $5,400.00 |
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 California, MO?
573. All exchanges NANPA lists for California are in 573.
How many phone companies have exchanges in California?
4, holding 4 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing California 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 California?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 15 users come to $299.00 a month. For comparison, 15 users on RingCentral RingEX Core list at $450.00 a month (checked September 28, 2026).