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

EUREKA prefixes in area code 620

NANPA records 4 assigned NXX blocks to rate center EUREKA in area code 620, 0.6% of the 705 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. 4 holders hold those blocks, the largest being ONVOY, LLC - KS (1), SOUTHWESTERN BELL (1), UNITED STATES CELLULAR - KS (1). The earliest assignment on record here is 2001-06-08 and the most recent 2021-11-04. 4 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 309, 369, 406, 435 – overlay codes cover the same geography, so a rate center is served by all of them.

4 assigned blocks – 0.6% of 620
4 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
620-559 Onvoy ONVOY, LLC - KS 2021-11-04 yes yes
620-583 AT&T SOUTHWESTERN BELL – yes yes
620-750 UNITED STATES CELLULAR - KS – yes yes
620-953 Lumen LEVEL 3 COMMUNICATIONS, LLC - KS 2001-06-08 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
ONVOY, LLC - KS Onvoy 1 25%
SOUTHWESTERN BELL AT&T 1 25%
UNITED STATES CELLULAR - KS – 1 25%
LEVEL 3 COMMUNICATIONS, LLC - KS Lumen 1 25%

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 EUREKA in area code 620?

4 blocks: 559, 583, 750, 953. The table above gives the holder of each.

Which carriers have numbers in EUREKA?

ONVOY, LLC - KS (1 block), SOUTHWESTERN BELL (1 block), UNITED STATES CELLULAR - KS (1 block), LEVEL 3 COMMUNICATIONS, LLC - KS (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is EUREKA 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 620

All 705 prefixes in 620