All assignees
709 prefixes in 520 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 520-200 | HAYDEN | 7175 | 2002-10-24 | Yes |
| 520-201 | SAN MANUEL | 7175 | 2002-10-24 | Yes |
| 520-202 | TUCSON | 7552 | — | — |
| 520-203 | TUCSON | 7465 | 2003-08-13 | Yes |
| 520-204 | TUCSON | 829J | 2003-12-04 | Yes |
| 520-205 | TUCSON | 9636 | — | Yes |
| 520-206 | TUCSON | 9636 | — | — |
| 520-207 | TUCSON | 318J | — | Yes |
| 520-208 | CASAGRANDE | 3285 | 2001-01-08 | Yes |
| 520-209 | TUCSON | 9636 | — | — |
| 520-210 | TOMBSTONE | 630E | 2013-08-20 | Yes |
| 520-211 | XXXXXXXXXX | MULT | — | — |
| 520-212 | CASCABEL | 2226 | — | — |
| 520-213 | CASAGRANDE | 6529 | 2013-06-25 | Yes |
| 520-214 | TUCSON | 630E | 2015-11-19 | Yes |
| 520-215 | BLACKWATER | 2179 | — | — |
| 520-216 | NOGALES | 6572 | — | Yes |
| 520-217 | CASAGRANDE | 9636 | 2015-12-29 | Yes |
| 520-218 | TUCSON | 9636 | — | — |
| 520-219 | TUCSON | 9636 | — | — |
| 520-220 | SIERRAVIST | 6529 | 2002-05-31 | Yes |
| 520-221 | BENSON | 6572 | 2003-04-08 | Yes |
| 520-222 | TUCSON | 9636 | 2011-10-06 | Yes |
| 520-223 | NOGALES | 3285 | 2002-04-09 | Yes |
| 520-224 | SIERRAVIST | 7175 | — | Yes |
| 520-225 | TUCSON | 9636 | — | Yes |
| 520-226 | SIERRAVIST | 3285 | 2002-04-09 | Yes |
| 520-227 | SIERRAVIST | 6529 | 2002-05-16 | Yes |
| 520-228 | TUCSON | 9636 | — | — |
| 520-229 | TUCSON | 9636 | — | Yes |
| 520-230 | TUCSON | 6572 | — | Yes |
| 520-231 | WHITLOW | 587F | — | Yes |
| 520-232 | TUCSON | 9636 | — | Yes |
| 520-233 | CASAGRANDE | 630E | — | Yes |
| 520-234 | SIERRAVIST | 6529 | 2002-11-06 | Yes |
| 520-235 | TUCSON | 6572 | — | — |
| 520-236 | SIERRAVIST | 5562 | 2002-09-17 | Yes |
| 520-237 | TUCSON | 6572 | — | — |
| 520-238 | YUMA | 6529 | — | Yes |
| 520-239 | TUCSON | 7217 | — | Yes |
| 520-240 | TUCSON | 6572 | — | — |
| 520-241 | TUCSON | 6010 | — | — |
| 520-242 | WILLCOX | 6572 | 2021-10-28 | Yes |
| 520-243 | TUCSON | 9636 | — | Yes |
| 520-244 | TUCSON | 6529 | 2016-03-14 | Yes |
| 520-245 | TUCSON | 6529 | — | — |
| 520-246 | TUCSON | 3285 | 2020-10-30 | Yes |
| 520-247 | TUCSON | 6010 | 2001-01-18 | — |
| 520-248 | TUCSON | 6529 | — | Yes |
| 520-249 | SIERRAVIST | 6529 | — | Yes |
| 520-250 | TUCSON | 6529 | — | Yes |
| 520-251 | CASAGRANDE | 6529 | — | Yes |
| 520-252 | CASAGRANDE | 6529 | — | Yes |
| 520-253 | WILLCOX | 6572 | 2003-04-08 | Yes |
| 520-254 | WILLCOX | 3285 | 2004-04-02 | Yes |
| 520-255 | SIERRAVIST | 6572 | 2004-04-28 | Yes |
| 520-256 | TUCSON | 6529 | 2001-01-29 | Yes |
| 520-257 | TUCSON | 6529 | 2014-08-19 | Yes |
| 520-258 | TUCSON | 9636 | — | Yes |
| 520-259 | TUCSON | 8293 | — | — |
| 520-260 | TUCSON | 6572 | — | Yes |
| 520-261 | TUCSON | 587F | 2009-07-16 | Yes |
| 520-262 | TUCSON | 6572 | 2010-02-17 | Yes |
| 520-263 | SIERRAVIST | 318J | — | Yes |
| 520-264 | NOGALES | 6572 | — | Yes |
| 520-265 | BENSON | 6529 | 2002-08-09 | Yes |
| 520-266 | SIERRAVIST | 6529 | 2002-08-09 | Yes |
| 520-267 | SIERRAVIST | 8293 | — | — |
| 520-268 | TUCSON | 6572 | 2013-03-14 | Yes |
| 520-269 | TUCSON | 6572 | 2007-02-05 | Yes |
| 520-270 | TUCSON | 6529 | — | — |
| 520-271 | TUCSON | 6529 | — | Yes |
| 520-272 | TUCSON | 6010 | — | — |
| 520-273 | TUCSON | 6010 | 2014-08-19 | Yes |
| 520-274 | TUCSON | 6529 | 2016-09-14 | Yes |
| 520-275 | TUCSON | 6010 | — | — |
| 520-276 | TUCSON | 587F | 2014-10-30 | Yes |
| 520-277 | WHITLOW | 630E | 2012-05-08 | Yes |
| 520-278 | TUCSON | 5562 | 2014-08-28 | Yes |
| 520-279 | TUCSON | 6572 | 2014-02-18 | Yes |
| 520-280 | CASAGRANDE | 6529 | — | Yes |
| 520-281 | NOGALES | 9636 | — | — |
| 520-282 | TUCSON | 6572 | — | Yes |
| 520-283 | TUCSON | 6529 | 2014-09-23 | Yes |
| 520-284 | TUCSON | 7465 | 2009-03-17 | Yes |
| 520-285 | NOGALES | 9636 | — | Yes |
| 520-286 | TUCSON | 6529 | 2013-01-11 | Yes |
| 520-287 | NOGALES | 9636 | — | — |
| 520-288 | TUCSON | 6010 | 2011-04-21 | Yes |
| 520-289 | TUCSON | 6572 | 2006-06-28 | Yes |
| 520-290 | TUCSON | 9636 | — | — |
| 520-291 | TUCSON | 9636 | — | — |
| 520-292 | TUCSON | 9636 | — | — |
| 520-293 | TUCSON | 9636 | — | — |
| 520-294 | TUCSON | 9636 | — | — |
| 520-295 | TUCSON | 9636 | — | — |
| 520-296 | TUCSON | 9636 | — | — |
| 520-297 | TUCSON | 9636 | — | — |
| 520-298 | TUCSON | 9636 | — | — |
| 520-299 | TUCSON | 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.