All assignees
799 prefixes in 608 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 608-300 | BLANCHADVL | 965H | 2020-10-16 | Yes |
| 608-301 | MADISON | 9327 | — | Yes |
| 608-302 | JANESVILLE | 6534 | — | Yes |
| 608-303 | MADISON | 6630 | — | — |
| 608-304 | LA CROSSE | 5562 | — | Yes |
| 608-305 | JANESVILLE | 829J | 2001-02-15 | Yes |
| 608-306 | PRARIDCHIN | 6508 | 2001-02-15 | Yes |
| 608-307 | JANESVILLE | 6630 | 2001-04-18 | — |
| 608-308 | MADISON | 520K | — | — |
| 608-309 | BLAIR | 1159 | 2001-05-24 | Yes |
| 608-310 | MADISON | 520K | — | Yes |
| 608-311 | XXXXXXXXXX | MULT | — | — |
| 608-312 | BELOIT | 5562 | — | Yes |
| 608-313 | BELOIT | 520K | — | Yes |
| 608-314 | JANESVILLE | 520K | — | Yes |
| 608-315 | TOMAH | 5562 | — | Yes |
| 608-316 | MADISON | 7216 | — | Yes |
| 608-317 | LA CROSSE | 6274 | — | Yes |
| 608-318 | SUNPRAIRIE | 792K | 2004-02-03 | Yes |
| 608-319 | DODGEVILLE | 0886 | 2001-05-11 | Yes |
| 608-320 | MADISON | 6534 | — | Yes |
| 608-321 | MADISON | 520K | — | — |
| 608-322 | JANESVILLE | 6534 | — | Yes |
| 608-323 | ARCADIA | 1159 | — | Yes |
| 608-324 | MONROE | 0963 | — | — |
| 608-325 | MONROE | 0963 | — | — |
| 608-326 | PRARIDCHIN | 1155 | — | — |
| 608-327 | MADISON | 5489 | — | Yes |
| 608-328 | MONROE | 0963 | — | — |
| 608-329 | MONROE | 0963 | — | — |
| 608-330 | PLATTEVL | 6274 | 2004-05-24 | Yes |
| 608-331 | PLATTEVL | 6508 | — | Yes |
| 608-332 | MADISON | 6534 | — | — |
| 608-333 | MADISON | 520K | 2004-06-17 | Yes |
| 608-334 | MADISON | 6534 | — | — |
| 608-335 | MADISON | 6534 | — | — |
| 608-336 | MONROE | 0963 | 2011-08-19 | Yes |
| 608-337 | ONTARIO | 0913 | — | Yes |
| 608-338 | MADISON | 6534 | — | Yes |
| 608-339 | ADAMS | 0886 | — | Yes |
| 608-340 | BRIGGSVL | 0886 | 2001-05-11 | Yes |
| 608-341 | DODGEVILLE | 6274 | — | Yes |
| 608-342 | PLATTEVL | 0934 | — | — |
| 608-343 | TOMAH | 6274 | — | Yes |
| 608-344 | TOMAH | 6274 | — | Yes |
| 608-345 | MADISON | 6508 | — | — |
| 608-346 | BELOIT | 6508 | — | — |
| 608-347 | MADISON | 6508 | — | — |
| 608-348 | PLATTEVL | 0934 | — | — |
| 608-349 | PLATTEVL | 0934 | — | — |
| 608-350 | MAUSTON | 0886 | 2001-05-11 | Yes |
| 608-351 | WEST SALEM | 6529 | 2008-01-29 | Yes |
| 608-352 | JANESVILLE | 516C | 2008-05-14 | Yes |
| 608-353 | MELROSE | 225C | 2023-06-22 | Yes |
| 608-354 | MADISON | 7216 | — | Yes |
| 608-355 | BARABOO | 0924 | — | — |
| 608-356 | BARABOO | 0924 | — | — |
| 608-357 | PRARIDCHIN | 1155 | — | — |
| 608-358 | MADISON | 6534 | 2001-02-14 | — |
| 608-359 | JANESVILLE | 6529 | — | Yes |
| 608-360 | LOGANVILLE | 0886 | 2001-05-11 | Yes |
| 608-361 | BELOIT | 9327 | — | Yes |
| 608-362 | BELOIT | 9327 | — | — |
| 608-363 | BELOIT | 9327 | — | — |
| 608-364 | BELOIT | 9327 | — | — |
| 608-365 | BELOIT | 9327 | — | — |
| 608-366 | SPARTA | 0913 | — | — |
| 608-367 | BELOIT | 495J | 2020-09-08 | Yes |
| 608-368 | BELOIT | 516C | — | Yes |
| 608-369 | WESTFIELD | 6274 | — | Yes |
| 608-370 | SAUK CITY | 6274 | 2001-05-11 | Yes |
| 608-371 | JANESVILLE | 9327 | 2001-05-09 | Yes |
| 608-372 | TOMAH | 0922 | — | — |
| 608-373 | JANESVILLE | 9327 | — | Yes |
| 608-374 | TOMAH | 0922 | — | — |
| 608-375 | BOSCOBEL | 0922 | — | — |
| 608-376 | MADISON | 9748 | — | — |
| 608-377 | TOMAH | 6508 | — | Yes |
| 608-378 | WARRENS | 0922 | — | — |
| 608-379 | MOUNT HOPE | 6508 | 2001-05-02 | Yes |
| 608-380 | PRARIDCHIN | 983F | 2012-08-21 | Yes |
| 608-381 | MADISON | 6508 | — | Yes |
| 608-382 | ADAMS | 698E | 2010-02-23 | — |
| 608-383 | RICHLD CTR | 0886 | 2001-05-11 | Yes |
| 608-384 | MINERAL PT | 7216 | 2016-03-23 | Yes |
| 608-385 | LA CROSSE | 6529 | — | Yes |
| 608-386 | LA CROSSE | 6274 | — | Yes |
| 608-387 | TOMAH | 6508 | 2003-06-11 | Yes |
| 608-388 | SPARTA | 0913 | — | — |
| 608-389 | BARABOO | 007F | 2020-09-03 | Yes |
| 608-390 | CENTERVL | 1159 | 2001-05-24 | Yes |
| 608-391 | BOSCOBEL | 6508 | 2003-10-21 | Yes |
| 608-392 | LA CROSSE | 0895 | — | — |
| 608-393 | BARABOO | 6274 | — | Yes |
| 608-394 | LA CROSSE | 6534 | 2020-11-23 | Yes |
| 608-395 | MADISON | 9327 | — | Yes |
| 608-396 | MELROSE | 1159 | 2001-05-24 | Yes |
| 608-397 | LA CROSSE | 6508 | — | Yes |
| 608-398 | MADISON | 996H | 2020-09-30 | Yes |
| 608-399 | HOLMEN | 1159 | 2001-05-16 | Yes |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.