Telephone numbers in WashingtonWelcome to Washington Telephone Numbers Information, your source of information on telephone numbers in Washington. Washington is located in the Pacific Northwest region of the United States. Washington is the 18th most extensive, the 13th most populous state. Washington was named after George Washington, the first President of the United States, the state was made out of the western part of the Washington Territory, which was ceded by Britain in 1846. Washington is sometimes referred to as Washington State to distinguish it from Washington, D.C., the capital of the United States, which is often shortened to Washington. Washington state has a population of 7,405,743 and an area of 184,827km2, giving it a population density of 40.07/km2. About Telephone Numbers in WashingtonWithin the state of Washington, there are 6 area codes giving a total of 4,800 possible Exchange Codes. The Exchange Codes are split up as follows:- 3,061 currently assigned to a service provider.- 1,604 currently vacant and available for assignment. - 135 unavailable for assignment. Of the 3,061 currently active Exchange Codes, 1,728 are allocated for number pooling. Allowing for unallocated thousand blocks, that gives an allocation pool of 22,958,000 currently available telephone numbers or about 3.10 numbers per person. These are the area codes covering Washington: