Area Code and Exchange (360) 231 in Washington
Exchange Code 231 for Area Code 360 covers the city of Yale, Cowlitz County in the State of Washington. It is centered at N 45º 59' 43.4", W 122º 22' 48.35". This Exchange Code was introduced on 11 February 1995 and is designated as being used for Landline telephones.
This Exchange covers telephone numbers ranging from (360) 231-0000 to (360) 231-9999.
Technical Information for Exchange (360) 231
NXX/Exchange Code: 231
Rate Center: YALE
Time Zone: PST
Exchange Status: Active
NXX Intro Date: 11 February 1995
CBSA Code: 31020
Number Pooling: Yes
Number Pooling in Exchange (360) 231
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 360-231 and the following thousand blocks are currently assigned to carriers.