Area code
606
606 is a United States area code. Under the North American Numbering Plan it belongs to Kentucky, which has 5 area codes in total.
Validate a number in 606
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 606 at a glance
NANPA lists 636 central office codes (prefixes) in use in area code 606, held by 39 holders across 126 rate centers.
| Fact | Value |
|---|---|
| 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 in area code 606
| 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% |
Who holds the prefixes in 606
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.
| 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. Find which carrier a number is on, or browse the prefix holders.
History of area code 606
- 1955-01-01 Area code 606 went into service.
- 2000-04-01 Area code 859 went into service and names 606 as its parent.
Area codes nearest to 606
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
ZIP codes in area code 606
101 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| London, KY | 6 |
| Ashland, KY | 4 |
| Somerset, KY | 3 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 606 numbers
1,788 FCC complaints are on file for 1,458 numbers in 606, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 85 |
| 2024 | 42 |
| 2025 | 62 |
Other area codes in Kentucky
Kentucky is one state with 5 area codes in the NANPA table. 606 is one of them.
Next to 606 in the numbering table
These are the codes just before and after 606 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 606 was first assigned in Kentucky. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Kentucky next to a 606 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 606
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.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.