All assignees
800 prefixes in 410 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 410-200 | EASTON | 7228 | 2004-05-27 | Yes |
| 410-201 | BALTIMORE | 9212 | — | — |
| 410-202 | SALISBURY | 6395 | 2004-10-14 | Yes |
| 410-203 | ELLICOTTCY | 9212 | — | — |
| 410-204 | ARBUTUS | 9212 | — | Yes |
| 410-205 | PIKESVILLE | 4036 | — | Yes |
| 410-206 | CATONSVL | 4036 | — | — |
| 410-207 | BALTIMORE | 6395 | — | — |
| 410-208 | BERLIN | 9212 | — | Yes |
| 410-209 | BALTIMORE | 9212 | — | Yes |
| 410-210 | GLENBURNIE | 6395 | 2020-01-08 | Yes |
| 410-211 | XXXXXXXXXX | MULT | — | — |
| 410-212 | ANNAPOLIS | 6855 | — | Yes |
| 410-213 | OCEAN CITY | 9212 | — | Yes |
| 410-214 | RISING SUN | 2593 | 2009-03-11 | Yes |
| 410-215 | BALTIMORE | 6395 | — | — |
| 410-216 | ANNAPOLIS | 9212 | — | Yes |
| 410-217 | BALTIMORE | 9212 | — | — |
| 410-218 | BALTIMORE | 6395 | — | — |
| 410-219 | SALISBURY | 9212 | — | — |
| 410-220 | ELKRIDGE | 5562 | 2011-09-30 | Yes |
| 410-221 | CAMBRIDGE | 9212 | — | — |
| 410-222 | SEVERN | 9212 | — | — |
| 410-223 | BALTIMORE | 9212 | — | — |
| 410-224 | ANNAPOLIS | 9212 | — | — |
| 410-225 | BALTIMORE | 9212 | — | — |
| 410-226 | OXFORD | 9212 | — | Yes |
| 410-227 | CATONSVL | 4036 | — | — |
| 410-228 | CAMBRIDGE | 9212 | — | — |
| 410-229 | COCKEYSVL | 9212 | — | — |
| 410-230 | BALTIMORE | 9212 | — | — |
| 410-231 | SOLOMONS | 4036 | — | Yes |
| 410-232 | BALTIMORE | 6630 | — | — |
| 410-233 | BALTIMORE | 9212 | — | — |
| 410-234 | BALTIMORE | 9212 | — | — |
| 410-235 | BALTIMORE | 9212 | — | — |
| 410-236 | TOWSON | 4036 | — | — |
| 410-237 | BALTIMORE | 9212 | — | Yes |
| 410-238 | ESSEX | 9212 | — | Yes |
| 410-239 | REISTERSTN | 9212 | — | — |
| 410-240 | BALTIMORE | 6855 | 2011-10-06 | Yes |
| 410-241 | BALTIMORE | 6395 | — | — |
| 410-242 | ARBUTUS | 9212 | — | — |
| 410-243 | BALTIMORE | 9212 | — | — |
| 410-244 | BALTIMORE | 9212 | — | — |
| 410-245 | CATONSVL | 4036 | — | — |
| 410-246 | BALTIMORE | 7228 | — | Yes |
| 410-247 | ARBUTUS | 9212 | — | — |
| 410-248 | PARKVILLE | 9212 | — | Yes |
| 410-249 | TOWSON | 9212 | — | Yes |
| 410-250 | OCEAN CITY | 9212 | — | — |
| 410-251 | SALISBURY | 6395 | — | — |
| 410-252 | TOWSON | 9212 | — | — |
| 410-253 | EASTON | 4036 | — | — |
| 410-254 | BALTIMORE | 9212 | — | — |
| 410-255 | ARGRGBSNIS | 9212 | — | — |
| 410-256 | PARKVILLE | 9212 | — | — |
| 410-257 | NORTHBEACH | 9212 | — | — |
| 410-258 | BALTIMORE | 6855 | — | Yes |
| 410-259 | WESTMINSTR | 6395 | — | — |
| 410-260 | SEVERNA PK | 9212 | — | Yes |
| 410-261 | BALTIMORE | 9212 | — | Yes |
| 410-262 | BALTIMORE | 6855 | — | Yes |
| 410-263 | ANNAPOLIS | 9212 | — | — |
| 410-264 | WATERLO236 | 9212 | — | Yes |
| 410-265 | WOODLAWN | 9212 | — | — |
| 410-266 | ANNAPOLIS | 9212 | — | — |
| 410-267 | ANNAPOLIS | 9212 | — | Yes |
| 410-268 | ANNAPOLIS | 9212 | — | — |
| 410-269 | SEVERNA PK | 9212 | — | Yes |
| 410-270 | SALISBURY | 6810 | — | — |
| 410-271 | ANNAPOLIS | 6395 | — | — |
| 410-272 | ABERDEEN | 9212 | — | — |
| 410-273 | ABERDEEN | 9212 | — | Yes |
| 410-274 | BALTIMORE | 6395 | — | — |
| 410-275 | CECILTON | 9212 | — | Yes |
| 410-276 | BALTIMORE | 9212 | — | — |
| 410-277 | WOODLAWN | 9212 | — | Yes |
| 410-278 | ABERDEEN | 9212 | — | — |
| 410-279 | ANNAPOLIS | 6395 | — | — |
| 410-280 | ANNAPOLIS | 9212 | — | Yes |
| 410-281 | WOODLAWN | 9212 | — | — |
| 410-282 | DUNDALK | 9212 | — | — |
| 410-283 | TOWSON | 6630 | — | — |
| 410-284 | DUNDALK | 9212 | — | — |
| 410-285 | DUNDALK | 9212 | — | — |
| 410-286 | NORTHBEACH | 9212 | — | Yes |
| 410-287 | NORTH EAST | 9212 | — | — |
| 410-288 | DUNDALK | 9212 | — | — |
| 410-289 | OCEAN CITY | 9212 | — | — |
| 410-290 | COLUMBIA | 9212 | — | — |
| 410-291 | BALTIMORE | 9212 | — | Yes |
| 410-292 | CATONSVL | 4036 | — | — |
| 410-293 | ANNAPOLIS | 829J | — | — |
| 410-294 | CATONSVL | 4036 | — | — |
| 410-295 | ANNAPOLIS | 9212 | — | — |
| 410-296 | TOWSON | 9212 | — | — |
| 410-297 | ABERDEEN | 9212 | — | Yes |
| 410-298 | WOODLAWN | 9212 | — | — |
| 410-299 | BALTIMORE | 6395 | — | — |
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.