All assignees
799 prefixes in 608 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 608-200 | BELOIT | 965H | 2020-09-24 | Yes |
| 608-201 | JANESVILLE | 6534 | — | — |
| 608-202 | JANESVILLE | 9748 | — | — |
| 608-203 | MIDDLETON | 520K | — | Yes |
| 608-204 | MADISON | 520K | — | — |
| 608-205 | STOUGHTON | 520K | — | Yes |
| 608-206 | MADISON | 6274 | — | Yes |
| 608-207 | BELOIT | 6529 | — | Yes |
| 608-208 | JANESVILLE | 5562 | — | Yes |
| 608-209 | MADISON | 6529 | — | Yes |
| 608-210 | MADISON | 520K | — | Yes |
| 608-211 | XXXXXXXXXX | MULT | — | — |
| 608-212 | MADISON | 6274 | — | Yes |
| 608-213 | MADISON | 6529 | — | Yes |
| 608-214 | MONROE | 6274 | — | Yes |
| 608-215 | MADISON | 6508 | — | — |
| 608-216 | MADISON | 9327 | — | Yes |
| 608-217 | MADISON | 6529 | — | Yes |
| 608-218 | MADISON | 9327 | — | Yes |
| 608-219 | MADISON | 6274 | — | Yes |
| 608-220 | MADISON | 6274 | — | Yes |
| 608-221 | MADISON | 9327 | — | — |
| 608-222 | MADISON | 9327 | — | — |
| 608-223 | MADISON | 9327 | — | — |
| 608-224 | MADISON | 9327 | — | Yes |
| 608-225 | MADISON | 6274 | — | Yes |
| 608-226 | MADISON | 9327 | — | — |
| 608-227 | MADISON | 5489 | — | Yes |
| 608-228 | MADISON | 6274 | — | Yes |
| 608-229 | MADISON | 5489 | — | Yes |
| 608-230 | MADISON | 520K | — | Yes |
| 608-231 | MADISON | 9327 | — | — |
| 608-232 | MADISON | 9327 | — | Yes |
| 608-233 | MADISON | 9327 | — | — |
| 608-234 | MADISON | 7216 | — | Yes |
| 608-235 | MADISON | 6274 | — | Yes |
| 608-236 | MADISON | 9327 | — | Yes |
| 608-237 | MADISON | 7216 | — | Yes |
| 608-238 | MADISON | 9327 | — | — |
| 608-239 | MADISON | 6529 | — | Yes |
| 608-240 | MADISON | 9327 | — | — |
| 608-241 | MADISON | 9327 | — | — |
| 608-242 | MADISON | 9327 | — | — |
| 608-243 | MADISON | 9327 | — | — |
| 608-244 | MADISON | 9327 | — | — |
| 608-245 | MADISON | 9327 | — | — |
| 608-246 | MADISON | 9327 | — | — |
| 608-247 | JANESVILLE | 6274 | — | Yes |
| 608-248 | COCHRANE | 0866 | — | — |
| 608-249 | MADISON | 9327 | — | — |
| 608-250 | MADISON | 9327 | — | Yes |
| 608-251 | MADISON | 9327 | — | — |
| 608-252 | MADISON | 9327 | — | — |
| 608-253 | WISCONDLLS | 0886 | — | Yes |
| 608-254 | WISCONDLLS | 0886 | — | Yes |
| 608-255 | MADISON | 9327 | — | — |
| 608-256 | MADISON | 9327 | — | — |
| 608-257 | MADISON | 9327 | — | — |
| 608-258 | MADISON | 9327 | — | — |
| 608-259 | MADISON | 9327 | — | Yes |
| 608-260 | MADISON | 9327 | — | Yes |
| 608-261 | MADISON | 9327 | — | — |
| 608-262 | MADISON | 9327 | — | — |
| 608-263 | MADISON | 9327 | — | — |
| 608-264 | MADISON | 9327 | — | — |
| 608-265 | MADISON | 9327 | — | — |
| 608-266 | MADISON | 9327 | — | — |
| 608-267 | MADISON | 9327 | — | — |
| 608-268 | MADISON | 829J | — | — |
| 608-269 | SPARTA | 0913 | — | — |
| 608-270 | MADISON | 9327 | — | Yes |
| 608-271 | MADISON | 9327 | — | — |
| 608-272 | CATARACT | 0913 | — | Yes |
| 608-273 | MADISON | 9327 | — | — |
| 608-274 | MADISON | 9327 | — | — |
| 608-275 | MADISON | 9327 | — | — |
| 608-276 | MADISON | 9327 | — | — |
| 608-277 | MADISON | 9327 | — | — |
| 608-278 | MADISON | 9327 | — | — |
| 608-279 | MADISON | 6274 | — | Yes |
| 608-280 | MADISON | 9327 | — | Yes |
| 608-281 | MADISON | 9327 | — | — |
| 608-282 | MADISON | 9327 | — | Yes |
| 608-283 | MADISON | 9327 | — | Yes |
| 608-284 | MADISON | 9327 | — | Yes |
| 608-285 | MADISON | 9327 | — | Yes |
| 608-286 | MADISON | 9327 | — | Yes |
| 608-287 | MADISON | 9327 | — | Yes |
| 608-288 | MADISON | 9327 | — | — |
| 608-289 | JANESVILLE | 6274 | — | Yes |
| 608-290 | JANESVILLE | 6274 | — | Yes |
| 608-291 | OREGON | 792K | — | Yes |
| 608-292 | MADISON | 478J | 2020-08-03 | Yes |
| 608-293 | MONROE | 6508 | — | Yes |
| 608-294 | MADISON | 9327 | — | Yes |
| 608-295 | JANESVILLE | 6274 | — | Yes |
| 608-296 | WESTFIELD | 0886 | — | Yes |
| 608-297 | MONTELLO | 0886 | — | Yes |
| 608-298 | MADISON | 9327 | — | Yes |
| 608-299 | BELOIT | 829J | — | 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.