NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

WILLSBORO prefixes in area code 518

NANPA records 3 assigned NXX blocks to rate center WILLSBORO in area code 518, 0.4% of the 775 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 3 holders hold those blocks, the largest being VERIZON NEW YORK, INC. (1), TVC ALBANY, INC. DBA FIRSTLIGHT FIBER (1), ONVOY SPECTRUM, LLC (1). 3 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

3 assigned blocks – 0.4% of 518
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
518-963 Verizon VERIZON NEW YORK, INC. – yes yes
518-981 TVC ALBANY, INC. DBA FIRSTLIGHT FIBER – yes yes
518-983 Charter ONVOY SPECTRUM, LLC – yes yes

The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.

Who holds the blocks

HolderBrandBlocksShare here
VERIZON NEW YORK, INC. Verizon 1 33.3%
TVC ALBANY, INC. DBA FIRSTLIGHT FIBER – 1 33.3%
ONVOY SPECTRUM, LLC Charter 1 33.3%

Frequently asked

Which prefixes belong to WILLSBORO in area code 518?

3 blocks: 963, 981, 983. The table above gives the holder of each.

Which carriers have numbers in WILLSBORO?

VERIZON NEW YORK, INC. (1 block), TVC ALBANY, INC. DBA FIRSTLIGHT FIBER (1 block), ONVOY SPECTRUM, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is WILLSBORO a city?

It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.

Other rate centers in 518

All 775 prefixes in 518