Area Code and Exchange (608) 999 in Wisconsin
Exchange Code 999 for Area Code 608 covers the city of Madison, Dane County in the State of Wisconsin. It is centered at N 43º 4' 22.99", W 89º 24' 4.43". This Exchange Code was introduced on 18 February 2015 and is designated as being used for Landline telephones.
This Exchange covers telephone numbers ranging from (608) 999-0000 to (608) 999-9999.
Technical Information for Exchange (608) 999
NXX/Exchange Code: 999
Rate Center: MADISON
Time Zone: CST
Exchange Status: Active
NXX Intro Date: 18 February 2015
CBSA Code: 31540
Number Pooling: Yes
Number Pooling in Exchange (608) 999
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 608-999 and the following thousand blocks are currently assigned to carriers.