All assignees
800 prefixes in 303 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 303-200 | DENVER | 7378 | — | Yes |
| 303-201 | DENVER | 6630 | — | — |
| 303-202 | DENVER | 9636 | — | — |
| 303-203 | DENVER | 9748 | — | — |
| 303-204 | DENVER | 6567 | — | — |
| 303-205 | DENVER | 9636 | — | — |
| 303-206 | DENVER | 6630 | — | — |
| 303-207 | DENVER | 6630 | — | — |
| 303-208 | DENVER | 6630 | — | — |
| 303-209 | DENVER | 7229 | — | — |
| 303-210 | DENVER | 6529 | — | Yes |
| 303-211 | XXXXXXXXXX | MULT | — | — |
| 303-212 | DENVER | 9748 | — | — |
| 303-213 | DENVER | 6630 | — | — |
| 303-214 | DENVER | 7229 | — | Yes |
| 303-215 | DENVER | 9636 | — | — |
| 303-216 | DENVER | 9636 | — | — |
| 303-217 | DENVER | 7229 | — | Yes |
| 303-218 | DENVER | 7229 | — | Yes |
| 303-219 | DENVER | 7229 | — | Yes |
| 303-220 | DENVER | 9636 | — | — |
| 303-221 | DENVER | 9636 | — | — |
| 303-222 | DENVER | 7229 | — | — |
| 303-223 | DENVER | 6118 | — | — |
| 303-224 | DENVER | 9636 | — | — |
| 303-225 | DENVER | 6118 | — | Yes |
| 303-226 | DENVER | 6118 | — | — |
| 303-227 | DENVER | 9636 | — | — |
| 303-228 | DENVER | 6118 | — | — |
| 303-229 | DENVER | 6567 | — | — |
| 303-230 | DENVER | 6630 | — | — |
| 303-231 | DENVER | 9636 | — | — |
| 303-232 | DENVER | 9636 | — | — |
| 303-233 | DENVER | 9636 | — | — |
| 303-234 | DENVER | 9636 | — | — |
| 303-235 | DENVER | 9636 | — | — |
| 303-236 | DENVER | 9636 | — | — |
| 303-237 | DENVER | 9636 | — | — |
| 303-238 | DENVER | 9636 | — | — |
| 303-239 | DENVER | 9636 | — | — |
| 303-240 | DENVER | 6630 | — | — |
| 303-241 | DENVER | 6567 | — | — |
| 303-242 | DENVER | 7229 | — | Yes |
| 303-243 | DENVER | 6874 | — | Yes |
| 303-244 | DENVER | 9636 | — | — |
| 303-245 | DENVER | 9636 | — | — |
| 303-246 | DENVER | 6529 | — | Yes |
| 303-247 | DENVER | 9636 | — | — |
| 303-248 | DENVER | 7378 | — | Yes |
| 303-249 | DENVER | 6010 | — | — |
| 303-250 | DENVER | 6010 | — | — |
| 303-251 | DENVER | 6630 | — | — |
| 303-252 | DENVER | 9636 | — | — |
| 303-253 | DENVER | 7378 | — | Yes |
| 303-254 | DENVER | 9636 | — | — |
| 303-255 | DENVER | 9636 | — | — |
| 303-256 | DENVER | 7378 | — | — |
| 303-257 | DENVER | 6529 | — | Yes |
| 303-258 | DENVER | 9636 | — | Yes |
| 303-259 | DENVER | 9748 | — | — |
| 303-260 | DENVER | 9636 | — | Yes |
| 303-261 | DENVER | 9636 | — | Yes |
| 303-262 | DENVER | 7378 | — | — |
| 303-263 | DENVER | 6567 | — | — |
| 303-264 | DENVER | 7378 | — | Yes |
| 303-265 | DENVER | 9636 | — | Yes |
| 303-266 | DENVER | 6630 | — | — |
| 303-267 | DENVER | 9636 | — | — |
| 303-268 | DENVER | 6118 | — | — |
| 303-269 | DENVER | 9636 | — | Yes |
| 303-270 | DENVER | 9636 | — | — |
| 303-271 | DENVER | 9636 | — | — |
| 303-272 | DENVER | 9636 | — | — |
| 303-273 | DENVER | 9636 | — | — |
| 303-274 | DENVER | 9636 | — | — |
| 303-275 | DENVER | 9636 | — | — |
| 303-276 | DENVER | 026D | 2021-08-19 | Yes |
| 303-277 | DENVER | 9636 | — | — |
| 303-278 | DENVER | 9636 | — | — |
| 303-279 | DENVER | 9636 | — | — |
| 303-280 | DENVER | 9636 | — | — |
| 303-281 | DENVER | 9636 | — | — |
| 303-282 | DENVER | 9636 | — | — |
| 303-283 | DENVER | 9636 | — | — |
| 303-284 | DENVER | 318J | — | Yes |
| 303-285 | DENVER | 6118 | — | — |
| 303-286 | DENVER | 9636 | — | — |
| 303-287 | DENVER | 9636 | — | — |
| 303-288 | DENVER | 9636 | — | — |
| 303-289 | DENVER | 9636 | — | — |
| 303-290 | DENVER | 9636 | — | — |
| 303-291 | DENVER | 9636 | — | — |
| 303-292 | DENVER | 9636 | — | — |
| 303-293 | DENVER | 9636 | — | — |
| 303-294 | DENVER | 9636 | — | — |
| 303-295 | DENVER | 9636 | — | — |
| 303-296 | DENVER | 9636 | — | — |
| 303-297 | DENVER | 9636 | — | — |
| 303-298 | DENVER | 9636 | — | — |
| 303-299 | DENVER | 9636 | — | — |
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.