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Area Code and Exchange (534) 421 in Wisconsin

Exchange Code 421 for Area Code 534 covers the city of High Bridge, Ashland County in the State of Wisconsin. It is centered at N 46º 23' 19.82", W 90º 44' 10.67". This Exchange Code was introduced on 25 October 2017 and is designated as being used for Landline telephones.

This Exchange covers telephone numbers ranging from (534) 421-0000 to (534) 421-9999.

Technical Information for Exchange (534) 421

NPA/Area Code: 534
NXX/Exchange Code: 421
City: High Bridge
County: Ashland
State: Wisconsin
Rate Center: MARENGO
OCN: 7575
Time Zone: CST
DST Observed:
Exchange Status: Active
NXX Use Type: Landline
NXX Intro Date: 25 October 2017
Latitude: 46.3888384
Longitude: -90.7362963
New NPA:
LATA: 352
FIPS: 55003
CBSA Code:
Number Pooling: Yes


Number Pooling in Exchange (534) 421

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 534-421 and the following thousand blocks are currently assigned to carriers.