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
443-400 BRYNPKLNCM 7229 — Yes
443-401 BALTIMORE 6395 2011-10-17 Yes
443-402 EDGEWOOD 7325 — Yes
443-403 ABERDEEN 6119 2001-06-20 Yes
443-404 SOLOMONS 5562 — Yes
443-405 RANDALLSTN 318J — Yes
443-406 ELKTON 7325 — Yes
443-407 DUNDALK 7229 — Yes
443-408 SPARROWSPT 7229 — Yes
443-409 EDGEWOOD 829J — Yes
443-410 GLENBURNIE 508J 2013-06-21 Yes
443-411 XXXXXXXXXX MULT — —
443-412 CHURCHVL 7325 — Yes
443-413 BALTIMORE 6855 — Yes
443-414 BALTIMORE 6855 — Yes
443-415 BALTIMORE 6855 — Yes
443-416 BALTIMORE 6855 — Yes
443-417 FALLSTON 7325 — Yes
443-418 BALTIMORE 6855 — Yes
443-419 GLENWOOD 829J — Yes
443-420 ELLICOTTCY 071F — Yes
443-421 FORK 4036 — —
443-422 GLENBURNIE 4036 2009-02-13 Yes
443-423 BALTIMORE 6119 — Yes
443-424 CARDIFF 7325 — Yes
443-425 PARKVILLE 7325 — Yes
443-426 RANDALLSTN 829J — Yes
443-427 PRINCEANNE 2593 — —
443-428 COCKEYSVL 2593 — —
443-429 WOODLAWN 829J — Yes
443-430 COLUMBIA 7229 2001-05-18 Yes
443-431 RANDALLSTN 2593 — Yes
443-432 PRINCEFRCK 829J — Yes
443-433 ANNAPOLIS 7229 2001-02-21 Yes
443-434 FEDERALSBG 073H — Yes
443-435 BALTIMORE 6855 2011-02-01 Yes
443-436 WOODLAWN 9212 — Yes
443-437 POCOMOKE 7325 2004-11-01 Yes
443-438 BALTIMORE 6395 2008-10-08 Yes
443-439 TRAPPE 6395 2004-11-01 Yes
443-440 ANNAPOLIS 7229 — Yes
443-441 GLENWOOD 7325 — Yes
443-442 PARKVILLE 829J 2001-05-09 Yes
443-443 ARBUTUS 939H 2023-11-21 Yes
443-444 BALTIMORE 9212 — Yes
443-445 ELKRIDGE 9212 — Yes
443-446 QUEENSTOWN 7228 2004-11-01 Yes
443-447 BALTIMORE 4036 2008-12-15 Yes
443-448 DENTON 318J 2004-11-01 Yes
443-449 BALTIMORE 829J 2007-03-28 Yes
443-450 PIKESVILLE 6119 — Yes
443-451 BALTIMORE 829J — —
443-452 BALTIMORE 829J 2005-09-07 Yes
443-453 BALTIMORE 876D 2007-10-12 Yes
443-454 ANNAPOLIS 6855 — Yes
443-455 BALTIMORE 9212 2006-03-09 Yes
443-456 EDGEWOOD 318J — Yes
443-457 BRYNPKLNCM 7325 — Yes
443-458 ANNAPOLIS 7229 — Yes
443-459 ELKRIDGE 829J — Yes
443-460 ESSEX 7229 — Yes
443-461 PARKVILLE 829J — Yes
443-462 BALTIMORE 6395 2008-11-06 Yes
443-463 BALTIMORE 6855 — Yes
443-464 CHURCHVL 829J 2010-03-16 Yes
443-465 TOWSON 6395 — Yes
443-466 ELKTON 5562 — Yes
443-467 BALTIMORE 4036 2009-03-20 Yes
443-468 BALTIMORE 6855 2007-04-04 Yes
443-469 BALTIMORE 4036 2009-03-20 Yes
443-470 TOWSON 829J 2008-04-29 Yes
443-471 PIKESVILLE 829J — Yes
443-472 COLUMBIA 6119 — Yes
443-473 BALTIMORE 6855 2007-03-28 Yes
443-474 CATONSVL 4036 — —
443-475 BALTIMORE 7228 2011-06-01 Yes
443-476 ANNAPOLIS 9212 — —
443-477 CAMBRIDGE 6395 2007-01-13 Yes
443-478 BALTIMORE 6395 2009-03-06 Yes
443-479 WATERLO236 9212 — —
443-480 CHESTERTN 6395 — Yes
443-481 ANNAPOLIS 829J — Yes
443-482 ANNAPOLIS 9212 — 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
443-488 BALTIMORE 4036 2010-06-23 Yes
443-489 CHASE 7325 — Yes
443-490 EDGEWOOD 071F — Yes
443-491 PARKTON 876D — Yes
443-492 ELKRIDGE 6119 — Yes
443-493 DELMAR 6395 2009-03-06 Yes
443-494 MILLERSVL 071F — Yes
443-495 PARKVILLE 071F — Yes
443-496 EASTON 5562 — Yes
443-497 SALISBURY 5562 — Yes
443-498 CATONSVL 7229 — Yes
443-499 JARRETTSVL 071F — 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.