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Area Code and Exchange (509) 905 in Washington

Exchange Code 905 for Area Code 509 is located in the State of Washington.

This Exchange covers telephone numbers ranging from (509) 905-0000 to (509) 905-9999.

Technical Information for Exchange (509) 905

NPA/Area Code: 509
NXX/Exchange Code: 905
State: Washington
Rate Center: POMEROY
OCN: 5812
Time Zone:
DST Observed:
Exchange Status: Active
NXX Use Type: Unknown
New NPA:
CBSA Code:
Number Pooling: Yes


Number Pooling in Exchange (509) 905

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 509-905 and the following thousand blocks are currently assigned to carriers.