Area Code and Exchange (253) 657 in Washington
Exchange Code 657 for Area Code 253 covers the city of Kent, King County in the State of Washington. It is centered at N 47º 22' 51.36", W 122º 14' 5.44". This Exchange Code was introduced on 1 April 1997 and is designated as being used for Landline telephones.
This Exchange covers telephone numbers ranging from (253) 657-0000 to (253) 657-9999.
Technical Information for Exchange (253) 657
NXX/Exchange Code: 657
Rate Center: KENT
Time Zone: PST
Exchange Status: Active
NXX Intro Date: 1 April 1997
Number Pooling: Yes
Number Pooling in Exchange (253) 657
The initial set up of an Exchange was to have all 10,000 numbers (0000 - 9999) for a particular Rate Center allocated to the same local exhange carrier. With the advent of multiple carriers, allocating each one of them their own Exchange Code would be inefficient and soon use up the available number pools for a particular area. To counter this, some exchanges are split into blocks of 1,000 numbers, which can each be allocated to individual carriers. This cuts down on wasted numbers that aren't allocated as each carrier has a smaller pool available.Number Pooling is activated in Exchange 253-657 and the following thousand blocks are currently assigned to carriers.