NRNumberResearch Membership · Data 09/17/2026

← Area code 443

All assignees

800 prefixes in 443 · initial assignments from the NANPA CO code file, 09/17/2026

Prefixes held by all assignees in area code 443
NPA-NXXRate centerOCNAssignedPooled
443-200 WOODLAWN 7229 2001-02-21 Yes
443-201 WESTMINSTR 4036 — Yes
443-202 BALTIMORE 6395 2012-01-09 Yes
443-203 WEST RIVER 9212 — Yes
443-204 PIKESVILLE 4036 2003-05-15 Yes
443-205 CAMBRIDGE 6395 — Yes
443-206 PERRYVILLE 6395 — Yes
443-207 ELKTON 6626 — Yes
443-208 BALTIMORE 6855 2011-02-01 Yes
443-209 HAVREGRACE 829J — Yes
443-210 SALISBURY 6855 2011-09-30 Yes
443-211 XXXXXXXXXX MULT — —
443-212 SPARKSGLNC 829J — Yes
443-213 PIKESVILLE 9212 — Yes
443-214 ANNAPOLIS 4036 2011-10-11 Yes
443-215 CHESTERTN 2593 — —
443-216 DUNDALK 829J — Yes
443-217 ANNAPOLIS 2593 — —
443-218 WORTHINGTN 6119 — Yes
443-219 PARKVILLE 6119 — Yes
443-220 BALTIMORE 9212 — Yes
443-221 ANNAPOLIS 6119 — Yes
443-222 WORTHINGTN 876D — Yes
443-223 ANNAPOLIS 6395 — —
443-224 BALTIMORE 7228 — Yes
443-225 CAMBRIDGE 5562 2004-01-20 Yes
443-226 BALTIMORE 6855 — Yes
443-227 PT DEPOSIT 829J — Yes
443-228 CHASE 829J — Yes
443-229 SEVERNA PK 829J 2001-05-10 Yes
443-230 ODENTON 829J — Yes
443-231 ESSEX 7325 — Yes
443-232 WILLARDS 2593 — Yes
443-233 VIENNA 829J — Yes
443-234 SNOW HILL 829J — Yes
443-235 SALISBURY 6395 — —
443-236 CARDIFF 2593 — —
443-237 NORTHBEACH 2593 — —
443-238 PARKTON 829J — Yes
443-239 EASTON 4036 2004-01-20 Yes
443-240 BALTIMORE 4036 2012-01-27 Yes
443-241 WESTMINSTR 876D — —
443-242 SPARROWSPT 829J 2001-05-10 Yes
443-243 FALLSTON 6395 — —
443-244 WESTMINSTR 6119 — Yes
443-245 ELKTON 829J — Yes
443-246 ELKTON 2593 — —
443-247 UNION BDG 829J — Yes
443-248 BALTIMORE 6395 2007-01-15 Yes
443-249 STEVENSVL 9212 — Yes
443-250 BALTIMORE 6855 — Yes
443-251 CATONSVL 876D — Yes
443-252 PERRYVILLE 6395 2009-09-08 Yes
443-253 BALTIMORE 4036 — —
443-254 ANNAPOLIS 6855 — —
443-255 BALTIMORE 4036 — —
443-256 NORTH EAST 829J — Yes
443-257 BALTIMORE 6395 — Yes
443-258 EASTON 4036 — Yes
443-259 COLUMBIA 9212 — Yes
443-260 SALISBURY 9212 — Yes
443-261 SEVERNA PK 7228 — Yes
443-262 CENTREVL 9212 — Yes
443-263 BALTIMORE 9212 — —
443-264 PIKESVILLE 2593 — Yes
443-265 FORK 829J 2001-05-10 Yes
443-266 GLENWOOD 071F — Yes
443-267 DARLINGTON 7325 — Yes
443-268 BALTIMORE 2593 — —
443-269 TOWSON 2593 — Yes
443-270 GLENBURNIE 829J — —
443-271 BALTIMORE 6855 2002-10-21 Yes
443-272 RANDALLSTN 7325 — Yes
443-273 REISTERSTN 7325 — Yes
443-274 SEVERN 9212 — Yes
443-275 TOWSON 318J — Yes
443-276 COLUMBIA 7229 — Yes
443-277 SYKESVILLE 5562 — Yes
443-278 BALTIMORE 4492 2003-10-02 Yes
443-279 TOWSON 7229 — Yes
443-280 SYKESVILLE 4036 — Yes
443-281 COCKEYSVL 7229 — Yes
443-282 CHESTERTN 5562 2004-10-04 Yes
443-283 COLUMBIA 829J — —
443-284 WATERLO238 2593 — Yes
443-285 COLUMBIA 9212 — Yes
443-286 BALTIMORE 6395 — —
443-287 BALTIMORE 9212 — —
443-288 ELLICOTTCY 7229 — Yes
443-289 WESTMINSTR 7228 2011-05-16 Yes
443-290 PARKVILLE 7591 — Yes
443-291 HAMPSTEAD 6119 — Yes
443-292 CROFTON 6119 — Yes
443-293 WESTMINSTR 6395 — Yes
443-294 WEST RIVER 071F — Yes
443-295 PRINCEFRCK 6119 — Yes
443-296 WATERLO238 6119 — Yes
443-297 ARBUTUS 7325 — Yes
443-298 EASTON 4036 2002-11-15 Yes
443-299 FALLSTON 6395 — 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.