Area Code 206
Washington
Area code 206 serves Washington, primarily Seattle, in the Pacific Time (PT) time zone. It has served the region since 01-Jan-1947.
Overlay Area Code
This area code is part of an overlay region, meaning the same geographic area is served by multiple area codes. Overlay codes were introduced to meet growing demand for phone numbers without requiring existing customers to change their numbers.
This area code shares its geographic region with: area code 564 (Seattle).
In service since: 01-Jan-1947
Area Code Splits
Parts of this area code’s original geographic region were later assigned new area codes through splits. When a split occurs, some customers in the original area code region are assigned the new area code.
Split into: area code 253 (Tacoma), area code 425 (Bellevue).
Historical Timeline of Area Code 206
Area code 206 was created on January 1, 1947, as one of the original 86 North American Numbering Plan codes, covering the entire state of Washington. Over the following 78 years, it underwent four geographic splits and one overlay, making it one of the most frequently split original NANP codes. The 564 overlay was placed in service on June 10, 2025, ending 78 years without a supplementary code. Source: Wikipedia
- 1947: Area code 206 created as one of the 86 original NANP area codes, serving the entire state of Washington. The middle digit "0" in the N0X format indicated statewide coverage under pre-1953 numbering rules. Source: Wikipedia
- 1957: Area code 509 split off for the eastern two-thirds of Washington, roughly following the Cascade Mountains. Area code 206 retained western Washington. This initiated a 38-year period of stability (1957–1995) despite growing demand. Source: Wikipedia
- 1995: Area code 360 split from 206 on January 15, 1995. 360 was one of the first interchangeable NPA codes not conforming to the traditional N0X/N1X format, breaking a 48-year convention. Seattle/Tacoma metro retained 206; the remainder transferred to 360. Source: NANPA IL-94-01-001
- 1997: A rare three-way split on April 25, 1997 created area codes 253 (Tacoma/South Sound) and 425 (Eastside/Everett) simultaneously from 206 territory. Permissive dialing ran from April 27 to November 16, 1997. Source: Wikipedia
- 2000: WUTC decision UT-990219 ordered a single all-services overlay of area code 564 over 206, 253, 360, and 425. Permissive dialing began September 1, 2000. Source: NANPA PL-239
- 2001: WUTC suspended the 564 overlay under Docket UT-991535 until at least October 2002. Improved numbering efficiency from thousands-block number pooling reduced immediate urgency. Source: NANPA PL-298
- 2016: WUTC approved a stepped overlay plan in Docket UT-143787: 564 would first overlay 360, then expand to 206, 253, and 425 as each exhausted. Source: WUTC
- 2017: Area code 564 introduced, initially overlaying the 360 NPA. Mandatory 10-digit dialing implemented for all western Washington NPAs, eight years before the 206 overlay arrived. Source: WUTC
- 2023: WUTC approved expansion of the 564 overlay to the 206 NPA on June 15, 2023, under Docket UT-230108. Network preparation began September 10, 2024. Source: NANPA PL-620
- 2025: The 206/564 all-services overlay was placed in service on June 10, 2025. New phone numbers in the 206 area may receive a 564 area code once all 206 prefixes are assigned. Source: WUTC Docket UT-230108
The transition from a statewide code to a Seattle-core overlay illustrates the broader pattern of area code fragmentation driven by population growth and telecommunications expansion across the Pacific Northwest.
Unique Facts About Area Code 206
Area code 206 exhibits several characteristics that distinguish it from nearly every other numbering plan area in North America, from a rare three-way split to the longest overlay delay in modern numbering history. Source: Wikipedia
- Rare Three-Way Split: On April 25, 1997, area code 206 underwent a rare three-way split, simultaneously creating area codes 253 (Tacoma/South Sound) and 425 (Eastside/Everett). Most area code splits create only one new code; the 1997 event was one of the most complex numbering events in NANP history. Source: Wikipedia
- Interchangeable Code Pioneer: Area code 360, split from 206 in 1995, was one of the first two interchangeable NPA codes not conforming to the traditional N0X/N1X format, breaking a 48-year convention in North American numbering. Source: Wikipedia
- 25-Year Overlay Saga: The 564 overlay was first ordered in 2000, suspended in 2001, revived with a stepped approach in 2016, and not placed in service for 206 until June 2025. This 25-year journey from initial approval to implementation ranks among the longest in NANP history. Source: NANPA PL-239
- High Income and Education: The 206 service area has a median household income of $122,148 and 55.45% of residents hold a bachelor's degree or higher. These figures are significantly above the national medians of $75,149 and 33.7%, respectively.
- Split Cities: Two communities—Des Moines and Woodway—are split between area codes, with portions in both 206 and 253, a result of the 1995 and 1997 boundary adjustments driven by switching center capacity constraints. Source: Wikipedia
These characteristics reflect how numbering policy intersects with population growth, technology, and geography in one of the fastest-growing metropolitan regions in the United States.
FCC Regulatory History
Area code 206 has undergone five significant regulatory events over 79 years, involving the Washington Utilities and Transportation Commission (WUTC) and NANPA. The FCC delegates numbering authority to state commissions under the Telecommunications Act of 1996 (47 U.S.C. § 251(e)(2)), and WUTC holds primary jurisdiction over Washington state numbering matters. Source: WUTC
| Year | Event | Docket | Regulatory Action & Impact |
|---|---|---|---|
| 1994 | 360 relief planning for 206 | IL-94-01-001 | NANPA Informational Letter confirmed 360 as interchangeable code for relief of 206 NPA. Service date set for January 15, 1995. Source: NANPA IL-94-01-001 |
| 2000 | 564 all-services overlay ordered | UT-990219 | WUTC ordered overlay of 564 over 206, 253, 360, and 425. Permissive dialing began September 1, 2000; mandatory 10-digit dialing set for October 20, 2001. Source: NANPA PL-239 |
| 2001 | 564 overlay suspended | UT-991535 | WUTC suspended the 564 overlay and mandatory 10-digit dialing until at least October 2002. Thousands-block number pooling reduced immediate numbering pressure. Source: NANPA PL-298 |
| 2016 | Stepped overlay plan approved | UT-143787 | WUTC approved a novel stepped overlay: 564 first overlays 360, then expands to 206, 253, and 425 as each exhausts. Source: WUTC |
| 2023 | 564 expansion to 206 approved | UT-230108 | NANPA notified UTC of 206 exhaust. All-services overlay approved June 15, 2023. Network prep began September 10, 2024; service date June 10, 2025. Source: WUTC Docket UT-230108 |
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 206).
| County | Population | Share |
|---|---|---|
| King, WA | 1,030,099 | 97.7% |
| Kitsap, WA | 24,607 | 2.3% |
Call Context
This area code includes Seattle and surrounding communities in Washington. It is one of the original area codes established when the North American Numbering Plan was created in 1947.
Nearby Area Codes
Area codes geographically closest to 206.
Other Area Codes in Washington
Area codes that also serve Washington, linked for easy comparison.
Frequently Asked Questions
Common questions about area code 206 and how phone numbering works.
Phone numbers are assigned based on where the number was originally provisioned, not the caller's current location. Mobile phones retain their number when users move, and businesses may use numbers from regions where they don't have a physical presence. VoIP services can also provision numbers from virtually any area code.
Yes, mobile phones can have numbers from any area code in the region they were activated. Wireless carriers assign numbers from available pools regardless of phone type. When users change carriers or move to new areas, they typically keep their original number, which may have a different area code than their current location.
Start by looking up the area code on this site to understand its general geographic region. For the specific number, options include using your carrier's caller ID features or checking public directories. If you suspect fraud, you can report it to the FTC. To file a complaint about robocalls or spoofed numbers, visit the FCC Consumer Complaint Center. You can also register your number with the National Do Not Call Registry to reduce unwanted calls. Keep in mind that caller ID can display any name the caller chooses to set.
When an area's pool of available phone numbers runs low, regulators may introduce an "overlay" area code that covers the same geographic territory as the original. Both codes coexist, and new numbers are assigned from whichever code has availability. This area code shares its region with area code 564. Learn more in our overlay vs split guide.
While Seattle is a prominent city in this area code's coverage, the code serves the broader surrounding region as well. Area codes are assigned geographically and typically cover multiple cities, towns, and communities beyond any single anchor city.
This area code covers a metropolitan region with high population density. Dense urban areas typically have higher call volumes and may have multiple overlapping area codes to meet demand for phone numbers. Businesses and residents in these areas are more likely to need additional numbering resources.