NRNumberResearch Membership · Data 09/17/2026

← Area code 443

LEVEL 3 COMMUNICATIONS, LLC - MD

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

Prefixes held by LEVEL 3 COMMUNICATIONS, LLC - MD in area code 443
NPA-NXXRate centerOCNAssignedPooled
443-218 WORTHINGTN 6119 — Yes
443-219 PARKVILLE 6119 — Yes
443-221 ANNAPOLIS 6119 — Yes
443-244 WESTMINSTR 6119 — Yes
443-291 HAMPSTEAD 6119 — Yes
443-292 CROFTON 6119 — Yes
443-295 PRINCEFRCK 6119 — Yes
443-296 WATERLO238 6119 — Yes
443-300 SYKESVILLE 6119 — Yes
443-302 CROFTON 6119 — Yes
443-303 ABERDEEN 6119 — Yes
443-305 ARGRGBSNIS 6119 — Yes
443-307 BEL AIR 6119 — Yes
443-312 BRYNPKLNCM 6119 — Yes
443-313 FORK 6119 — Yes
443-316 WOODLAWN 6119 — Yes
443-320 BALTIMORE 6119 — Yes
443-329 WATERLO236 6119 — Yes
443-341 CATONSVL 6119 — Yes
443-345 ABERDEEN 6119 — Yes
443-352 PIKESVILLE 6119 — Yes
443-354 GLENBURNIE 6119 — Yes
443-355 ELLICOTTCY 6119 — Yes
443-356 BEL AIR 6119 — Yes
443-371 BEL AIR 6119 — Yes
443-380 WOODLAWN 6119 — Yes
443-391 COCKEYSVL 6119 — Yes
443-393 COLUMBIA 6119 — Yes
443-396 ODENTON 6119 — Yes
443-403 ABERDEEN 6119 2001-06-20 Yes
443-423 BALTIMORE 6119 — Yes
443-450 PIKESVILLE 6119 — Yes
443-472 COLUMBIA 6119 — Yes
443-483 CARDIFF 6119 — Yes
443-484 EDGEWOOD 6119 — Yes
443-485 ELKTON 6119 — Yes
443-486 PRINCEFRCK 6119 — Yes
443-487 WESTMINSTR 6119 — Yes
443-492 ELKRIDGE 6119 — Yes
443-501 PIKESVILLE 6119 — Yes
443-505 ESSEX 6119 — Yes
443-517 GLENBURNIE 6119 — Yes
443-519 TOWSON 6119 — Yes
443-545 COLUMBIA 6119 2001-05-18 Yes
443-550 NORTHBEACH 6119 — Yes
443-551 WOODLAWN 6119 — Yes
443-564 TOWSON 6119 — Yes
443-567 BEL AIR 6119 — Yes
443-569 ANNAPOLIS 6119 — Yes
443-590 REISTERSTN 6119 — Yes
443-594 SPARROWSPT 6119 — Yes
443-625 FORK 6119 2001-02-21 Yes
443-627 BALTIMORE 6119 — Yes
443-641 PIKESVILLE 6119 2001-05-18 Yes
443-666 CHESTERTN 6119 2012-05-23 Yes
443-740 BALTIMORE 6119 2005-02-03 Yes
443-746 EASTON 6119 2002-02-22 Yes
443-809 TOWSON 6119 2014-06-13 Yes
443-818 ARGRGBSNIS 6119 2005-12-30 Yes
443-832 COLUMBIA 6119 — Yes
443-877 NORTH EAST 6119 — Yes
443-898 PIKESVILLE 6119 2005-12-08 Yes
443-899 WATERLO238 6119 — Yes
443-926 ANNAPOLIS 6119 — Yes
443-927 BALTIMORE 6119 — Yes
443-951 ANNAPOLIS 6119 — Yes
443-964 NORTHBEACH 6119 2006-05-12 Yes
443-988 CENTREVL 6119 2006-06-08 Yes
443-992 BALTIMORE 6119 — 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.