509 area code
Where the 509 area code is, its overlay and how to dial a +1 509 number from anywhere.
The 509 area code is in Kennewick, Washington, United States (Pacific (PT)). To call from abroad: +1 509 555-0123.
The 509 area code is a geographic North American Numbering Plan (NANP) code covering Kennewick, Washington. It has been in service since 01-Jan-1957 and sits in the Pacific (PT) time zone.
How to dial a 509 number
+1 509 555-01231 509 555-0123509 555-0123Cities in the 509 area code
A 509 number is usually in one of these places in Washington — 7 counties.
Other Washington area codes
Frequently asked questions
Where is the 509 area code?
The 509 area code is in Kennewick, Washington, United States (Pacific (PT)).
Do I have to dial 10 digits for 509?
Yes — dial the area code plus the seven-digit number.
How do I call a 509 number from another country?
Dial your exit code (or +), then 1, then 509, then the number: +1 509 555-0123.
Source: NANPA numbering plan. An area code covers a region, not a precise address — a 509 number does not pinpoint a street or ZIP code.
Number holders in area code 509
Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 778 prefixes are in use in 509, shared by 73 companies. The largest holders:
| Company | Prefixes | Share |
|---|---|---|
| Qwest Corporation | 132 | 17% |
| New Cingular Wireless PCS, LLC | 77 | 10% |
| Ziply Fiber Northwest, LLC Dba Ziply Fiber | 69 | 9% |
| Onvoy, LLC | 66 | 8% |
| T-Mobile USA, Inc. | 63 | 8% |
| Cellco Partnership Dba Verizon Wireless | 59 | 8% |
Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.
Complaints about 509 numbers
- Reports to the FTC, last 30 days
- 385
- Recorded messages or robocalls
- 60%
- Rank among area codes
- #254 of 670
- Most reported subjects
- Other (145)
- Calls pretending to be government, businesses, or family and friends (63)
- Reducing your debt (credit cards, mortgage, student loans) (48)
Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.
Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).
All US area codes United States +1 Map of area code 509 — cities & rate centres