Area Code and Exchange (920) 581 in Wisconsin
Exchange Code 581 for Area Code 920 covers the city of Fond du Lac, Fond du Lac County in the State of Wisconsin. It is centered at N 43º 46' 22.96", W 88º 26' 49.38". This Exchange Code was introduced on 8 February 2001 and is designated as being used for Landline telephones.
This Exchange covers telephone numbers ranging from (920) 581-0000 to (920) 581-9999.
Technical Information for Exchange (920) 581
NXX/Exchange Code: 581
City: Fond du Lac
County: Fond du Lac
Rate Center: FONDDU LAC
Time Zone: CST
Exchange Status: Active
NXX Intro Date: 8 February 2001
CBSA Code: 22540
Number Pooling: Yes
Number Pooling in Exchange (920) 581
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 920-581 and the following thousand blocks are currently assigned to carriers.