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

CASTLEWOOD prefixes in area code 605

NANPA records 3 assigned NXX blocks to rate center CASTLEWOOD in area code 605, 0.4% of the 745 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 MCC TELEPHONY OF THE MID-WEST, LLC - SD (1), INTERSTATE TELECOM COOP, INC. - SD (1), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD (1). The earliest assignment on record here is 2010-08-04 and the most recent 2017-04-07. 2 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 605
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
605-414 MCC TELEPHONY OF THE MID-WEST, LLC - SD 2010-08-04 yes yes
605-793 INTERSTATE TELECOM COOP, INC. - SD – no yes
605-804 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD 2017-04-07 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
MCC TELEPHONY OF THE MID-WEST, LLC - SD – 1 33.3%
INTERSTATE TELECOM COOP, INC. - SD – 1 33.3%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD Verizon 1 33.3%

Frequently asked

Which prefixes belong to CASTLEWOOD in area code 605?

3 blocks: 414, 793, 804. The table above gives the holder of each.

Which carriers have numbers in CASTLEWOOD?

MCC TELEPHONY OF THE MID-WEST, LLC - SD (1 block), INTERSTATE TELECOM COOP, INC. - SD (1 block), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is CASTLEWOOD 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 605

All 745 prefixes in 605