Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
MADISON prefixes in area code 608
NANPA records 197 assigned NXX blocks to rate center MADISON in area code 608, 25.1% of the 785 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. 30 holders hold those blocks, the largest being WISCONSIN BELL INC (61), UNITED STATES CELLULAR - WI (21), NEW CINGULAR WIRELESS PCS, LLC - IL (18). The earliest assignment on record here is 2001-01-15 and the most recent 2025-08-06. 132 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 203, 207, 256, 304 – overlay codes cover the same geography, so a rate center is served by all of them.
197 assigned blocks – 25.1% of 608
30 holders of record
132 of them pooled in 1,000-number lots
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 608-204 | TDS TDS METROCOM, LLC | – | no | yes |
| 608-206 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-209 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 608-210 | TDS TDS METROCOM, LLC | – | yes | yes |
| 608-212 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-213 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 608-215 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | – | no | yes |
| 608-216 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-217 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 608-218 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-219 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-220 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-221 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-222 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-223 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-224 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-225 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-226 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-227 | Lumen LEVEL 3 COMMUNICATIONS, LLC - WI | – | yes | yes |
| 608-228 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-229 | Lumen LEVEL 3 COMMUNICATIONS, LLC - WI | – | yes | yes |
| 608-230 | TDS TDS METROCOM, LLC | – | yes | yes |
| 608-231 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-232 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-233 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-234 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC WI | – | yes | yes |
| 608-235 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-236 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-237 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC WI | – | yes | yes |
| 608-238 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-239 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 608-240 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-241 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-242 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-243 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-244 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-245 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-246 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-249 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-250 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-251 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-252 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-255 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-256 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-257 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-258 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-259 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-260 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-261 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-262 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-263 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-264 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-265 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-266 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-267 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-268 | Windstream PAETEC ITEL, LLC | – | no | yes |
| 608-270 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-271 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-273 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-274 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-275 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-276 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-277 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-278 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-279 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-280 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-281 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-282 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-283 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-284 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-285 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-286 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-287 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-288 | AT&T WISCONSIN BELL INC | – | no | yes |
| 608-292 | NUSO, LLC | 2020-08-03 | yes | yes |
| 608-294 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-298 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-301 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-303 | Spok SPOK, INC. | – | no | yes |
| 608-308 | TDS TDS METROCOM, LLC | – | no | yes |
| 608-310 | TDS TDS METROCOM, LLC | – | yes | yes |
| 608-316 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC WI | – | yes | yes |
| 608-320 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | yes | yes |
| 608-321 | TDS TDS METROCOM, LLC | – | no | yes |
| 608-327 | Lumen LEVEL 3 COMMUNICATIONS, LLC - WI | – | yes | yes |
| 608-332 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | no | yes |
| 608-333 | TDS TDS METROCOM, LLC | 2004-06-17 | yes | yes |
| 608-334 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | no | yes |
| 608-335 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | no | yes |
| 608-338 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | yes | yes |
| 608-345 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | – | no | yes |
| 608-347 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | – | no | yes |
| 608-354 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC WI | – | yes | yes |
| 608-358 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2001-02-14 | no | yes |
| 608-376 | American Messaging AMERICAN MESSAGING SERVICES, LLC | – | no | yes |
| 608-381 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | – | yes | yes |
| 608-395 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-398 | AIRESPRING, INC. | 2020-09-30 | yes | yes |
| 608-400 | Onvoy ONVOY, LLC - WI | 2017-09-28 | yes | yes |
| 608-405 | Telnyx TELNYX LLC | 2016-12-05 | yes | yes |
| 608-416 | Lumen LEVEL 3 COMMUNICATIONS, LLC - WI | 2014-10-03 | yes | yes |
| 608-417 | Lumen CENTURYLINK COMMUNICATIONS, LLC | 2007-02-23 | yes | yes |
| 608-421 | NUSO, LLC | 2013-03-08 | yes | yes |
| 608-422 | UNITED STATES CELLULAR - WI | 2014-02-27 | yes | yes |
| 608-438 | UNITED STATES CELLULAR - WI | 2002-01-15 | yes | yes |
| 608-440 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC WI | 2014-10-06 | yes | yes |
| 608-441 | TDS TDS METROCOM, LLC | – | no | yes |
| 608-442 | TDS TDS METROCOM, LLC | 2001-05-08 | no | yes |
| 608-443 | TDS TDS METROCOM, LLC | 2002-02-15 | yes | yes |
| 608-444 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-445 | UNITED STATES CELLULAR - WI | 2001-04-03 | yes | yes |
| 608-446 | TDS TDS METROCOM, LLC | – | no | yes |
| 608-458 | AT&T WISCONSIN BELL INC | 2001-08-21 | no | yes |
| 608-467 | Lumen LEVEL 3 COMMUNICATIONS, LLC - WI | 2002-05-13 | yes | yes |
| 608-469 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 2002-08-28 | no | yes |
| 608-471 | Peerless PEERLESS NETWORK OF WISCONSIN, LLC - WI | – | yes | yes |
| 608-504 | Onvoy ONVOY, LLC - WI | – | yes | yes |
| 608-509 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 2006-05-17 | yes | yes |
| 608-512 | Lumen LEVEL 3 COMMUNICATIONS, LLC - WI | – | yes | yes |
| 608-513 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-514 | Windstream PAETEC ITEL, LLC | 2008-02-14 | yes | yes |
| 608-515 | T-Mobile T-MOBILE USA, INC. | 2009-10-28 | yes | yes |
| 608-516 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-520 | Bandwidth BANDWIDTH.COM CLEC, LLC - WI | 2010-09-07 | yes | yes |
| 608-535 | Bandwidth BANDWIDTH.COM CLEC, LLC - WI | 2010-08-06 | yes | yes |
| 608-550 | American Messaging AMERICAN MESSAGING SERVICES, LLC | – | no | yes |
| 608-556 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | yes | yes |
| 608-559 | American Messaging AMERICAN MESSAGING SERVICES, LLC | – | no | yes |
| 608-571 | Peerless PEERLESS NETWORK OF WISCONSIN, LLC - WI | 2014-10-10 | yes | yes |
| 608-572 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | – | yes | yes |
| 608-575 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-576 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-577 | UNITED STATES CELLULAR - WI | 2002-08-28 | yes | yes |
| 608-578 | Spok SPOK, INC. | – | no | yes |
| 608-590 | Onvoy ONVOY, LLC - WI | 2018-11-21 | yes | yes |
| 608-598 | UNITED STATES CELLULAR - WI | 2015-07-31 | yes | yes |
| 608-608 | Onvoy ONVOY, LLC - WI | 2024-08-07 | yes | yes |
| 608-609 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2008-01-22 | yes | yes |
| 608-616 | Bandwidth BANDWIDTH.COM CLEC, LLC - WI | 2008-10-10 | yes | yes |
| 608-620 | Lumen LEVEL 3 TELECOM OF WISCONSIN, LP - WI | 2010-10-25 | yes | yes |
| 608-621 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 2020-10-15 | yes | yes |
| 608-622 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2008-08-04 | yes | yes |
| 608-628 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2002-06-20 | yes | yes |
| 608-630 | Charter CHARTER IP ENABLED SERVICES, LLC | – | yes | yes |
| 608-640 | UNITED STATES CELLULAR - WI | 2016-08-01 | yes | yes |
| 608-657 | Spok SPOK, INC. | – | no | yes |
| 608-658 | T-Mobile T-MOBILE USA, INC. | 2001-02-05 | yes | yes |
| 608-661 | TDS TDS METROCOM, LLC | – | no | yes |
| 608-663 | TDS TDS METROCOM, LLC | – | no | yes |
| 608-665 | TDS TDS METROCOM, LLC | 2008-08-12 | yes | yes |
| 608-669 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 2003-07-15 | yes | yes |
| 608-673 | IP HORIZON LLC | 2021-05-03 | yes | yes |
| 608-690 | CSC WIRELESS, LLC | 2020-07-08 | yes | yes |
| 608-692 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | no | yes |
| 608-695 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | no | yes |
| 608-698 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | no | yes |
| 608-707 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 608-709 | Lumen LEVEL 3 TELECOM OF WISCONSIN, LP - WI | 2012-10-12 | yes | yes |
| 608-710 | Charter ONVOY SPECTRUM, LLC | 2019-09-13 | yes | yes |
| 608-712 | UNITED STATES CELLULAR - WI | – | yes | yes |
| 608-716 | Lumen LEVEL 3 COMMUNICATIONS, LLC - WI | 2019-04-22 | yes | yes |
| 608-720 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC WI | 2016-06-09 | yes | yes |
| 608-721 | Onvoy ONVOY, LLC - WI | 2008-09-15 | yes | yes |
| 608-722 | HD CARRIER LLC | 2020-10-02 | yes | yes |
| 608-729 | Lumen LEVEL 3 COMMUNICATIONS, LLC - WI | 2005-11-09 | yes | yes |
| 608-733 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2017-09-11 | yes | yes |
| 608-740 | Windstream PAETEC ITEL, LLC | 2022-03-08 | yes | yes |
| 608-770 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | no | yes |
| 608-772 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | yes | yes |
| 608-800 | Onvoy ONVOY, LLC - WI | 2015-11-17 | yes | yes |
| 608-807 | Lumen LEVEL 3 COMMUNICATIONS, LLC - WI | – | yes | yes |
| 608-817 | Bandwidth BANDWIDTH.COM CLEC, LLC - WI | 2022-12-08 | yes | yes |
| 608-819 | Windstream PAETEC ITEL, LLC | 2001-01-15 | yes | yes |
| 608-843 | UNITED STATES CELLULAR - WI | 2003-04-18 | yes | yes |
| 608-852 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 2002-12-03 | yes | yes |
| 608-866 | TERRA NOVA TELECOM INC. | 2020-01-24 | yes | yes |
| 608-867 | COMMIO, LLC | 2019-04-18 | yes | yes |
| 608-886 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | – | yes | yes |
| 608-888 | Onvoy ONVOY, LLC - WI | 2015-08-17 | yes | yes |
| 608-890 | AT&T WISCONSIN BELL INC | 2003-12-10 | yes | yes |
| 608-893 | NUSO, LLC | 2023-02-08 | yes | yes |
| 608-895 | Twilio TWILIO INTERNATIONAL, INC. | 2021-05-28 | yes | yes |
| 608-896 | Dish BOOST SUBSCRIBERCO L.L.C. | 2023-04-10 | yes | yes |
| 608-906 | Onvoy ONVOY, LLC - WI | 2006-02-06 | yes | yes |
| 608-910 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 2024-02-14 | yes | yes |
| 608-914 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC WI | 2024-01-18 | yes | yes |
| 608-915 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC WI | 2024-01-18 | yes | yes |
| 608-916 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC WI | 2024-01-18 | yes | yes |
| 608-940 | Onvoy ONVOY, LLC - WI | 2024-06-12 | yes | yes |
| 608-949 | Peerless PEERLESS NETWORK OF WISCONSIN, LLC - WI | – | yes | yes |
| 608-957 | AT&T WISCONSIN BELL INC | – | yes | yes |
| 608-960 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2014-06-27 | yes | yes |
| 608-961 | Onvoy ONVOY, LLC - WI | 2025-02-05 | yes | yes |
| 608-977 | AT&T WISCONSIN BELL INC | 2015-04-28 | yes | yes |
| 608-982 | Vonage VONAGE AMERICA LLC | 2018-03-23 | yes | yes |
| 608-984 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2025-08-06 | yes | yes |
| 608-999 | Onvoy ONVOY, LLC - WI | 2015-02-18 | 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
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| WISCONSIN BELL INC | AT&T | 61 | 31% |
| UNITED STATES CELLULAR - WI | – | 21 | 10.7% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | AT&T | 18 | 9.1% |
| TDS METROCOM, LLC | TDS | 14 | 7.1% |
| ONVOY, LLC - WI | Onvoy | 11 | 5.6% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | Verizon | 10 | 5.1% |
| LEVEL 3 COMMUNICATIONS, LLC - WI | Lumen | 9 | 4.6% |
| TELEPORT COMMUNICATIONS AMERICA, LLC WI | AT&T | 9 | 4.6% |
| T-MOBILE USA, INC. | T-Mobile | 7 | 3.6% |
| PAETEC ITEL, LLC | Windstream | 4 | 2% |
| BANDWIDTH.COM CLEC, LLC - WI | Bandwidth | 4 | 2% |
| NUSO, LLC | – | 3 | 1.5% |
| SPOK, INC. | Spok | 3 | 1.5% |
| AMERICAN MESSAGING SERVICES, LLC | American Messaging | 3 | 1.5% |
| PEERLESS NETWORK OF WISCONSIN, LLC - WI | Peerless | 3 | 1.5% |
| LEVEL 3 TELECOM OF WISCONSIN, LP - WI | Lumen | 2 | 1% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Verizon | 2 | 1% |
| AIRESPRING, INC. | – | 1 | 0.5% |
| TELNYX LLC | Telnyx | 1 | 0.5% |
| CENTURYLINK COMMUNICATIONS, LLC | Lumen | 1 | 0.5% |
| CHARTER IP ENABLED SERVICES, LLC | Charter | 1 | 0.5% |
| IP HORIZON LLC | – | 1 | 0.5% |
| CSC WIRELESS, LLC | – | 1 | 0.5% |
| ONVOY SPECTRUM, LLC | Charter | 1 | 0.5% |
| HD CARRIER LLC | – | 1 | 0.5% |
| TERRA NOVA TELECOM INC. | – | 1 | 0.5% |
| COMMIO, LLC | – | 1 | 0.5% |
| TWILIO INTERNATIONAL, INC. | Twilio | 1 | 0.5% |
| BOOST SUBSCRIBERCO L.L.C. | Dish | 1 | 0.5% |
| VONAGE AMERICA LLC | Vonage | 1 | 0.5% |
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 MADISON in area code 608?
197 blocks: 204, 206, 209, 210, 212, 213, 215, 216, 217, 218, 219, 220 and 185 more, all listed in the table above.
Which carriers have numbers in MADISON?
WISCONSIN BELL INC (61 blocks), UNITED STATES CELLULAR - WI (21 blocks), NEW CINGULAR WIRELESS PCS, LLC - IL (18 blocks), TDS METROCOM, LLC (14 blocks), ONVOY, LLC - WI (11 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI (10 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is MADISON 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.