Area Code and Exchange (608) 621 in Wisconsin
Exchange Code 621 for Area Code 608 covers the city of Platteville, Grant County in the State of Wisconsin. It is centered at N 42º 44' 2.98", W 90º 28' 42.46". This Exchange Code was introduced on 19 January 2007 and is designated as being used for Wireless telephones.
This Exchange covers telephone numbers ranging from (608) 621-0000 to (608) 621-9999.
Technical Information for Exchange (608) 621
NXX/Exchange Code: 621
Rate Center: PLATTEVL
Time Zone: CST
Exchange Status: Active
NXX Intro Date: 19 January 2007
CBSA Code: 38420
Number Pooling: Yes
Number Pooling in Exchange (608) 621
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 608-621 and the following thousand blocks are currently assigned to carriers.