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Area Code and Exchange (509) 478 in Washington

Exchange Code 478 for Area Code 509 covers the city of Thornton, Whitman County in the State of Washington. It is centered at N 47º 7' 14.61", W 117º 23' 22.68". This Exchange Code was introduced on 4 February 1994 and is designated as being used for Landline telephones.

This Exchange covers telephone numbers ranging from (509) 478-0000 to (509) 478-9999.

In this Exchange Code there are 2 telephone numbers that our research shows belong to legitimate businesses.

Technical Information for Exchange (509) 478

NPA/Area Code: 509
NXX/Exchange Code: 478
City: Thornton
County: Whitman
State: Washington
Rate Center: ROSALIA
OCN: 4324
Time Zone: PST
DST Observed:
Exchange Status: Active
NXX Use Type: Landline
NXX Intro Date: 4 February 1994
Latitude: 47.1207257
Longitude: -117.3896325
New NPA:
LATA: 676
FIPS: 53075
CBSA Code: 39420
Number Pooling: Yes
CBSA Name: Pullman, WA


Number Pooling in Exchange (509) 478

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 509-478 and the following thousand blocks are currently assigned to carriers.

Businesses and other Entities in Exchange (509) 478 2

Below are details of all of the legitimate businesses and other entities that we have identified within this Exchange Code.

(509) 478-1727


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(509) 478-0207


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