---
title: "Area code 606: Kentucky, United States"
url: "https://lookvalid.com/area-code/606.md"
canonical_url: "https://lookvalid.com/area-code/606"
last_updated: "2026-10-23"
type: "reference"
summary: "Area code 606 serves Kentucky, United States. Number formats, numbering rules, a live phone validator and the other codes in Kentucky."
---

# Area code 606: Kentucky, United States

Area code 606 serves Kentucky, United States. Number formats, numbering rules, a live phone validator and the other codes in Kentucky.

NANPA lists 636 central office codes (prefixes) in use in area code 606, held by 39 holders across 126 rate centers.
New Cingular Wireless PCS holds the most prefixes, 92 (14%). 62% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
The FCC unwanted-call data has 1,788 complaints on file for 1,458 numbers in 606, most often filed as "Unwanted Calls". These are consumer reports, not findings.

## Facts

- In service since: 1955-01-01
- Time zone: EC
- Prefixes in use: 636
- Pooled prefixes: 395 (62%)
- Rate centers: 126
- Companies holding prefixes: 39
- Assignment dates on file: 2001-02-14 to 2026-05-27 (315 prefixes)
- ZIP codes in its places: 101

## Rate centers

| Rate center | Prefixes | Share |
| --- | --- | --- |
| CORBIN | 37 | 6% |
| PIKEVILLE | 30 | 5% |
| ASHLAND | 25 | 4% |
| SOMERSET | 24 | 4% |
| LONDON | 21 | 3% |
| HAZARD | 15 | 2% |
| MOREHEAD | 15 | 2% |
| MIDDLESBO | 14 | 2% |
| 118 other rate centers | 455 | 72% |

## Carriers

| Holder | Prefixes | Share |
| --- | --- | --- |
| New Cingular Wireless PCS | 92 | 14% |
| Onvoy | 79 | 12% |
| Windstream Kentucky East, INC. - Lexington | 74 | 12% |
| South Central Bell Tel | 55 | 9% |
| Verizon Wireless | 50 | 8% |
| Windstream Kentucky East, INC. - London | 43 | 7% |
| 33 other carriers | 243 | 38% |

A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company.

## History

- 1955-01-01: Area code 606 went into service.
- 2000-04-01: Area code 859 went into service and names 606 as its parent.

## Nearest area codes

The area codes closest to 606, measured between the centers of the ZIP code places they serve, are 859 (about 65 miles), 276 (about 112 miles), 865 (about 117 miles), 502 (about 118 miles) and 423 (about 121 miles).

## ZIP codes

101 ZIP codes fall in places that have a rate center in this area code. The places with the most are London, KY (6 ZIP codes), Ashland, KY (4 ZIP codes) and Somerset, KY (3 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes.

## Complaints on file

1,788 complaints for 1,458 numbers. Numbers whose latest complaint falls in each year:

- 2023: 85
- 2024: 42
- 2025: 62

## Questions

### Where is area code 606?

NANPA assigns area code 606 to Kentucky, United States.

### In which state does area code 606 sit?

Kentucky. 606 is one of 5 area codes the NANPA table assigns to the state.

### Which places does area code 606 cover?

The places with the most ZIP codes among the rate centers in 606 are London, KY, Ashland, KY and Somerset, KY. The rate center list on this page shows all of them.

### Who owns area code 606?

NANPA assigns area codes. Within 606, New Cingular Wireless PCS holds the most prefixes, 92 prefixes or 14%.

### Which time zone does 606 use?

The NANPA NPA report lists the time zone for 606 as EC.

### What year did 606 enter service?

The NANPA NPA report gives an in-service date of 1955-01-01, so 606 has been in use since 1955.

### Does area code 606 have an overlay?

The NANPA NPA report lists no other area code in an overlay with 606.

### Which area codes are nearest to 606?

The area codes closest to 606, measured between the centers of the ZIP code places they serve, are 859 (about 65 miles), 276 (about 112 miles), 865 (about 117 miles), 502 (about 118 miles) and 423 (about 121 miles).

### How many prefixes does area code 606 have?

NANPA's report dated 2026-10-17 lists 636 prefixes in service in 606, spread over 126 rate centers and 39 holders.

### Are there complaints about 606 numbers?

The FCC data on file has 1,788 complaints for 1,458 numbers in 606. They are unverified consumer reports. A number with no complaints on file is not proven safe.

Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).