---
title: "Frontier California phone number prefixes"
url: "https://lookvalid.com/carriers/frontier-california.md"
canonical_url: "https://lookvalid.com/carriers/frontier-california"
last_updated: "2026-10-19"
type: "reference"
summary: "Frontier California holds 1,074 of the 197,646 phone prefixes in service (<1%), across 1 states and territories and 21 area codes, per NANPA."
related: ["https://lookvalid.com/carriers.md", "https://lookvalid.com/tools/carrier-lookup.md"]
---

# Frontier California phone number prefixes

Frontier California holds 1,074 of the 197,646 phone prefixes in service (<1%), across 1 states and territories and 21 area codes, per NANPA.

Frontier California is one of the largest holders of North American phone number prefixes. NANPA assigned it 1,074 of the 197,646 central office codes in service, <1% of the total.

## Holder type

Landline telephone company. Frontier describes its service on its home page as fiber internet, TV and phone for homes and businesses; the holder is a Frontier operating company. Source: https://frontier.com/, read 2026-10-19.

## Facts

- Prefixes held: 1,074 of 197,646 in service (<1%)
- States and territories: 1
- Area codes: 21
- Pooled prefixes: 396 of 1,074 (37%)
- Thousands-blocks held in pooled prefixes: 115
- Rate centers: 186
- Registered names: Frontier California INC.
- Operating company numbers under this name: 3

## Prefixes by state or territory

| State or territory | Prefixes |
| --- | --- |
| CA | 1,074 |

## Prefixes by area code

| Area code | Prefixes |
| --- | --- |
| [562](https://lookvalid.com/area-code/562.md) | 158 |
| [909](https://lookvalid.com/area-code/909.md) | 156 |
| [760](https://lookvalid.com/area-code/760.md) | 140 |
| [805](https://lookvalid.com/area-code/805.md) | 140 |
| [310](https://lookvalid.com/area-code/310.md) | 137 |
| [626](https://lookvalid.com/area-code/626.md) | 75 |
| [951](https://lookvalid.com/area-code/951.md) | 69 |
| [714](https://lookvalid.com/area-code/714.md) | 39 |
| [818](https://lookvalid.com/area-code/818.md) | 37 |
| [661](https://lookvalid.com/area-code/661.md) | 29 |
| [559](https://lookvalid.com/area-code/559.md) | 22 |
| [408](https://lookvalid.com/area-code/408.md) | 17 |
| [209](https://lookvalid.com/area-code/209.md) | 13 |
| [707](https://lookvalid.com/area-code/707.md) | 13 |
| [530](https://lookvalid.com/area-code/530.md) | 9 |
| [949](https://lookvalid.com/area-code/949.md) | 7 |
| [415](https://lookvalid.com/area-code/415.md) | 6 |
| [213](https://lookvalid.com/area-code/213.md) | 3 |
| [323](https://lookvalid.com/area-code/323.md) | 2 |
| [424](https://lookvalid.com/area-code/424.md) | 1 |
| [442](https://lookvalid.com/area-code/442.md) | 1 |

## Caveats

The holder is the company NANPA assigned the codes to, under the legal name it registered, which can differ from the brand customers see. Numbers port, so a number in one of these prefixes may now be with another carrier. To see which carrier holds a number's block, use the [carrier lookup](https://lookvalid.com/tools/carrier-lookup.md).

See all holders in the [ranked table](https://lookvalid.com/carriers.md).

Source: NANPA central office code report dated 2026-10-17 and thousands-block report dated 2026-10-17.

## Related

- [Largest phone number holders by prefix](https://lookvalid.com/carriers.md)
- [Free carrier lookup](https://lookvalid.com/tools/carrier-lookup.md)