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
443-300 SYKESVILLE 6119 — Yes
443-301 BALTIMORE 4036 2012-04-05 Yes
443-302 CROFTON 6119 — Yes
443-303 ABERDEEN 6119 — Yes
443-304 ARBUTUS 071F — Yes
443-305 ARGRGBSNIS 6119 — Yes
443-306 SEVERNA PK 5562 — Yes
443-307 BEL AIR 6119 — Yes
443-308 SEVERN 7229 — Yes
443-309 ELKTON 5562 — Yes
443-310 BALTIMORE 4036 — —
443-311 XXXXXXXXXX MULT — —
443-312 BRYNPKLNCM 6119 — Yes
443-313 FORK 6119 — Yes
443-314 BALTIMORE 6855 2011-02-01 Yes
443-315 CATONSVL 4036 — Yes
443-316 WOODLAWN 6119 — Yes
443-317 CHASE 071F — Yes
443-318 COCKEYSVL 829J — Yes
443-319 COLUMBIA 829J — Yes
443-320 BALTIMORE 6119 — Yes
443-321 ANNAPOLIS 829J — —
443-322 TOWSON 829J 2001-05-10 Yes
443-323 SHARPTOWN 829J — Yes
443-324 BALTIMORE 6855 — Yes
443-325 ELLICOTTCY 829J — Yes
443-326 BALTIMORE 4036 2001-02-21 —
443-327 ABERDEEN 829J — Yes
443-328 SYKESVILLE 829J — Yes
443-329 WATERLO236 6119 — Yes
443-330 COCKEYSVL 829J — Yes
443-331 TANEYTOWN 829J — Yes
443-332 CROFTON 829J 2001-05-09 Yes
443-333 ANNAPOLIS 4036 2009-02-13 Yes
443-334 PIKESVILLE 7229 2001-03-14 Yes
443-335 BRYNPKLNCM 5562 — Yes
443-336 ANNAPOLIS 6855 — Yes
443-337 SPARROWSPT 2593 — Yes
443-338 SPARKSGLNC 829J — Yes
443-339 SHERWD FOR 829J — Yes
443-340 WESTMINSTR 6395 — —
443-341 CATONSVL 6119 — Yes
443-342 SOLOMONS 829J — Yes
443-343 MILLERSVL 7325 — Yes
443-344 SEVERNA PK 2593 — —
443-345 ABERDEEN 6119 — Yes
443-346 SEVERNA PK 2593 — Yes
443-347 CARDIFF 829J — Yes
443-348 WOODLAWN 7325 — Yes
443-349 SILVER RUN 2593 — —
443-350 ELKTON 6395 — Yes
443-351 ODENTON 829J — Yes
443-352 PIKESVILLE 6119 — Yes
443-353 COCKEYSVL 9212 2004-03-19 Yes
443-354 GLENBURNIE 6119 — Yes
443-355 ELLICOTTCY 6119 — Yes
443-356 BEL AIR 6119 — Yes
443-357 PIKESVILLE 9212 — Yes
443-358 SALISBURY 281E 2011-02-17 Yes
443-359 DELMAR 6395 — Yes
443-360 ABERDEEN 7325 — Yes
443-361 SYKESVILLE 2593 — —
443-362 EASTON 6855 — Yes
443-363 SEVERN 2593 — Yes
443-364 ELLICOTTCY 7325 — Yes
443-365 SALISBURY 6855 — Yes
443-366 SALISBURY 5562 2001-04-17 Yes
443-367 COLUMBIA 9212 — Yes
443-368 WESTMINSTR 2593 — —
443-369 BEL AIR 2593 — —
443-370 ANNAPOLIS 4036 — Yes
443-371 BEL AIR 6119 — Yes
443-372 EDGEWOOD 829J 2001-03-19 Yes
443-373 OCEAN CITY 5562 — Yes
443-374 ABERDEEN 829J — Yes
443-375 HAMPSTEAD 5562 — Yes
443-376 DUNDALK 7325 — Yes
443-377 TOWSON 6395 2010-06-09 Yes
443-378 BALTIMORE 6855 2004-07-27 Yes
443-379 PIKESVILLE 318J 2007-02-23 Yes
443-380 WOODLAWN 6119 — Yes
443-381 REISTERSTN 4036 — Yes
443-382 CAMBRIDGE 2593 — —
443-383 SILVER RUN 829J — Yes
443-384 PARKVILLE 829J — Yes
443-385 EASTON 2593 — —
443-386 BALTIMORE 6395 — Yes
443-387 POCOMOKE 2593 — —
443-388 BALTIMORE 6395 2006-04-13 Yes
443-389 SALISBURY 2593 — —
443-390 CHURCHVL 071F — Yes
443-391 COCKEYSVL 6119 — Yes
443-392 BALTIMORE 7325 — Yes
443-393 COLUMBIA 6119 — Yes
443-394 PIKESVILLE 9212 — —
443-395 ABERDEEN 9212 2009-08-13 Yes
443-396 ODENTON 6119 — Yes
443-397 SALISBURY 6395 2009-04-06 Yes
443-398 SYKESVILLE 5562 2001-03-15 Yes
443-399 DUNDALK 876D — 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.