All assignees
800 prefixes in 503 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 503-300 | BAY CITY | 792K | 2008-02-12 | Yes |
| 503-301 | PORTLAND | 6630 | — | — |
| 503-302 | SALEM | 5820 | — | Yes |
| 503-303 | CLACKAMAS | 7229 | — | Yes |
| 503-304 | SALEM | 9638 | — | — |
| 503-305 | CLACKAMAS | 7229 | — | Yes |
| 503-306 | PORTLAND | 9638 | — | — |
| 503-307 | PORTLAND | 5820 | — | — |
| 503-308 | CLATSKANIE | 7531 | — | Yes |
| 503-309 | PORTLAND | 6529 | — | Yes |
| 503-310 | PORTLAND | 5820 | — | — |
| 503-311 | XXXXXXXXXX | MULT | — | — |
| 503-312 | PORTLAND | 5820 | — | — |
| 503-313 | PORTLAND | 5820 | — | — |
| 503-314 | PORTLAND | 5820 | — | — |
| 503-315 | SALEM | 9638 | — | — |
| 503-316 | SALEM | 9638 | — | — |
| 503-317 | PORTLAND | 6529 | — | — |
| 503-318 | PORTLAND | 5820 | — | — |
| 503-319 | PORTLAND | 5820 | — | — |
| 503-320 | PORTLAND | 5820 | — | — |
| 503-321 | PORTLAND | 9638 | — | — |
| 503-322 | GARIBALDI | 4520 | — | — |
| 503-323 | PORTLAND | 9638 | — | — |
| 503-324 | BEAVERTON | 517K | — | — |
| 503-325 | ASTORIA | 9638 | — | — |
| 503-326 | PORTLAND | 9638 | — | — |
| 503-327 | PORTLAND | 7531 | — | Yes |
| 503-328 | GRESHAM | 7172 | — | Yes |
| 503-329 | PORTLAND | 6010 | — | — |
| 503-330 | BEAVERTON | 5562 | — | Yes |
| 503-331 | PORTLAND | 9638 | — | — |
| 503-332 | BEAVERTON | 5562 | — | Yes |
| 503-333 | PORTLAND | 6010 | 2006-09-21 | Yes |
| 503-334 | PORTLAND | 6529 | — | Yes |
| 503-335 | PORTLAND | 9638 | — | — |
| 503-336 | BEAVERTON | 318J | 2004-10-04 | Yes |
| 503-337 | ESTACADA | 2371 | — | — |
| 503-338 | ASTORIA | 9638 | — | Yes |
| 503-339 | SALEM | 3234 | — | Yes |
| 503-340 | PORTLAND | 9638 | — | — |
| 503-341 | PORTLAND | 5820 | — | — |
| 503-342 | CLACKAMAS | 3234 | — | Yes |
| 503-343 | CLACKAMAS | 3234 | — | Yes |
| 503-344 | CLACKAMAS | 3234 | — | Yes |
| 503-345 | PORTLAND | 3234 | — | Yes |
| 503-346 | PORTLAND | 9638 | — | — |
| 503-347 | PORTLAND | 5820 | — | — |
| 503-348 | PORTLAND | 5820 | — | — |
| 503-349 | PORTLAND | 5820 | — | — |
| 503-350 | BEAVERTON | 4323 | — | — |
| 503-351 | PORTLAND | 5820 | — | — |
| 503-352 | BEAVERTON | 7172 | — | Yes |
| 503-353 | CLACKAMAS | 9638 | — | — |
| 503-354 | TILLAMOOK | 3234 | 2002-09-20 | Yes |
| 503-355 | ROCKAWAY | 4520 | — | — |
| 503-356 | BEAVERTON | 4323 | — | — |
| 503-357 | BEAVERTON | 4323 | — | — |
| 503-358 | PORTLAND | 6529 | — | Yes |
| 503-359 | BEAVERTON | 4323 | — | — |
| 503-360 | PORTLAND | 750E | 2007-10-08 | Yes |
| 503-361 | SALEM | 9638 | — | — |
| 503-362 | SALEM | 9638 | — | — |
| 503-363 | SALEM | 9638 | — | — |
| 503-364 | SALEM | 9638 | — | — |
| 503-365 | SALEM | 9638 | — | — |
| 503-366 | ST HELENS | 9638 | — | — |
| 503-367 | PORTLAND | 6010 | 2004-12-08 | Yes |
| 503-368 | NEHALEM | 2387 | — | — |
| 503-369 | ST HELENS | 6010 | — | Yes |
| 503-370 | SALEM | 9638 | — | — |
| 503-371 | SALEM | 9638 | — | — |
| 503-372 | BEAVERTON | 7531 | — | Yes |
| 503-373 | SALEM | 9638 | — | — |
| 503-374 | TILLAMOOK | 3234 | 2002-06-17 | Yes |
| 503-375 | SALEM | 9638 | — | — |
| 503-376 | MCMINNVL | 3234 | — | Yes |
| 503-377 | BAY CITY | 4520 | — | — |
| 503-378 | SALEM | 9638 | — | — |
| 503-379 | MCMINNVL | 3234 | — | — |
| 503-380 | PORTLAND | 6529 | — | — |
| 503-381 | PORTLAND | 6529 | — | Yes |
| 503-382 | PORTLAND | 7531 | — | Yes |
| 503-383 | SALEM | 7531 | — | Yes |
| 503-384 | PORTLAND | 9638 | — | Yes |
| 503-385 | SALEM | 7531 | — | Yes |
| 503-386 | KNAPPA | 750E | 2008-09-04 | Yes |
| 503-387 | CLACKAMAS | 7531 | — | Yes |
| 503-388 | PORTLAND | 6010 | 2009-04-06 | Yes |
| 503-389 | NORTH PL | 7229 | — | Yes |
| 503-390 | SALEM | 9638 | — | — |
| 503-391 | SALEM | 9638 | — | — |
| 503-392 | CLOVERDALE | 4520 | — | — |
| 503-393 | SALEM | 9638 | — | — |
| 503-394 | SCIO | 2397 | — | — |
| 503-395 | RAINIER | 7531 | — | Yes |
| 503-396 | ST HELENS | 5820 | — | Yes |
| 503-397 | ST HELENS | 9638 | — | — |
| 503-398 | BEAVER | 4520 | — | — |
| 503-399 | SALEM | 9638 | — | — |
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.