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

ROUND LAKE prefixes in area code 224

NANPA records 12 assigned NXX blocks to rate center ROUND LAKE in area code 224, 2.0% of the 595 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. 5 holders hold those blocks, the largest being T-MOBILE USA, INC. (6), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL (2), COMCAST IP PHONE, LLC (2). The earliest assignment on record here is 2001-11-28 and the most recent 2023-08-16. 10 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 507, 518, 838, 847 – overlay codes cover the same geography, so a rate center is served by all of them.

12 assigned blocks – 2% of 224
5 holders of record
10 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
224-270 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 2001-11-28 no yes
224-308 T-Mobile T-MOBILE USA, INC. 2012-05-02 yes yes
224-338 Comcast COMCAST IP PHONE, LLC 2006-10-12 yes yes
224-390 T-Mobile T-MOBILE USA, INC. 2021-07-07 yes yes
224-473 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 2002-01-28 no yes
224-502 Onvoy ONVOY, LLC 2023-08-16 yes yes
224-540 T-Mobile T-MOBILE USA, INC. 2015-10-23 yes yes
224-577 T-Mobile T-MOBILE USA, INC. 2002-01-17 yes yes
224-757 Comcast COMCAST IP PHONE, LLC 2005-02-28 yes yes
224-814 T-Mobile T-MOBILE USA, INC. 2013-09-20 yes yes
224-818 T-Mobile T-MOBILE USA, INC. 2014-07-16 yes yes
224-933 FRACTEL, LLC 2019-10-10 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
T-MOBILE USA, INC. T-Mobile 6 50%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL Verizon 2 16.7%
COMCAST IP PHONE, LLC Comcast 2 16.7%
ONVOY, LLC Onvoy 1 8.3%
FRACTEL, LLC – 1 8.3%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to ROUND LAKE in area code 224?

12 blocks: 270, 308, 338, 390, 473, 502, 540, 577, 757, 814, 818, 933. The table above gives the holder of each.

Which carriers have numbers in ROUND LAKE?

T-MOBILE USA, INC. (6 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL (2 blocks), COMCAST IP PHONE, LLC (2 blocks), ONVOY, LLC (1 block), FRACTEL, 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 ROUND LAKE 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 224

All 595 prefixes in 224