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Area Code and Exchange (608) 400 in Wisconsin

Exchange Code 400 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 28 September 2017 and is designated as being used for Landline telephones.

This Exchange covers telephone numbers ranging from (608) 400-0000 to (608) 400-9999.

In this Exchange Code there are 2 telephone numbers that have been the subject of complaints to the FCC.

Technical Information for Exchange (608) 400

NPA/Area Code: 608
NXX/Exchange Code: 400
City: Madison
County: Dane
State: Wisconsin
Rate Center: MADISON
OCN: 225C
Time Zone: CST
DST Observed:
Exchange Status: Active
NXX Use Type: Landline
NXX Intro Date: 28 September 2017
Latitude: 43.0730517
Longitude: -89.4012302
New NPA:
Overlay:
LATA: 354
FIPS: 55025
CBSA Code: 31540
Number Pooling: Yes
CBSA Name: Madison, WI

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Number Pooling in Exchange (608) 400

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 608-400 and the following thousand blocks are currently assigned to carriers.