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
443-500 BALTIMORE 4036 2009-03-20 Yes
443-501 PIKESVILLE 6119 — Yes
443-502 HAVREGRACE 7325 — Yes
443-503 DUNDALK 7229 — Yes
443-504 FALLSTON 829J — Yes
443-505 ESSEX 6119 — Yes
443-506 BALTIMORE 6855 — Yes
443-507 HAMPSTEAD 7325 — Yes
443-508 HAMPSTEAD 829J — Yes
443-509 BALTIMORE 6395 2009-02-10 Yes
443-510 ANNAPOLIS 6395 2007-12-04 Yes
443-511 XXXXXXXXXX MULT — —
443-512 EDGEWOOD 9212 — Yes
443-513 BERLIN 4036 — Yes
443-514 CATONSVL 829J — Yes
443-515 CAMBRIDGE 6395 2009-06-08 Yes
443-516 SYKESVILLE 876D — Yes
443-517 GLENBURNIE 6119 — Yes
443-518 COLUMBIA 9212 2008-12-16 Yes
443-519 TOWSON 6119 — Yes
443-520 CATONSVL 4036 — —
443-521 CAMBRIDGE 6395 — Yes
443-522 REISTERSTN 829J — Yes
443-523 SALISBURY 9212 — Yes
443-524 BALTIMORE 7229 — —
443-525 BALTIMORE 4036 2009-03-20 Yes
443-526 HAVREGRACE 829J — Yes
443-527 BALTIMORE 6855 2001-03-19 —
443-528 BEL AIR 6855 — Yes
443-529 BALTIMORE 6855 2008-07-22 Yes
443-530 DUNDALK 829J — Yes
443-531 BALTIMORE 4036 2009-03-20 Yes
443-532 PRINCEFRCK 5562 — Yes
443-533 JARRETTSVL 7325 — Yes
443-534 ANNAPOLIS 6395 2001-01-15 Yes
443-535 COLUMBIA 9212 — Yes
443-536 WESTMINSTR 5562 — Yes
443-537 COLUMBIA 6395 — Yes
443-538 COLUMBIA 6855 2001-06-20 —
443-539 COLUMBIA 829J — Yes
443-540 BALTIMORE 4036 — —
443-541 COCKEYSVL 829J — Yes
443-542 COLUMBIA 318J — Yes
443-543 ARBUTUS 9212 — Yes
443-544 PIKESVILLE 829J 2001-05-10 Yes
443-545 COLUMBIA 6119 2001-05-18 Yes
443-546 COLUMBIA 9212 — Yes
443-547 WESTMINSTR 6395 2009-05-07 Yes
443-548 PIKESVILLE 7229 — Yes
443-549 DUNDALK 829J — Yes
443-550 NORTHBEACH 6119 — Yes
443-551 WOODLAWN 6119 — Yes
443-552 BALTIMORE 9212 — Yes
443-553 ELKTON 6395 — —
443-554 CHASE 6855 2001-07-23 Yes
443-555 DIR ASST MULT — —
443-556 COCKEYSVL 9212 — —
443-557 GLENBURNIE 7229 — Yes
443-558 ABERDEEN 7229 2001-01-15 Yes
443-559 ESSEX 318J — Yes
443-560 BALTIMORE 6855 2011-07-18 Yes
443-561 ELKRIDGE 829J — Yes
443-562 BALTIMORE 4036 — —
443-563 BALTIMORE 6855 2006-11-14 Yes
443-564 TOWSON 6119 — Yes
443-565 RANDALLSTN 829J 2001-05-10 Yes
443-566 CHESAPKECY 6395 2004-09-16 Yes
443-567 BEL AIR 6119 — Yes
443-568 ARBUTUS 7229 — Yes
443-569 ANNAPOLIS 6119 — Yes
443-570 BALTIMORE 6855 — —
443-571 BALTIMORE 6395 2011-12-06 Yes
443-572 GLENBURNIE 9212 — Yes
443-573 BALTIMORE 829J — Yes
443-574 ELLICOTTCY 829J — Yes
443-575 ARBUTUS 829J 2001-05-10 Yes
443-576 RANDALLSTN 7229 2001-02-21 Yes
443-577 GLENBURNIE 829J — Yes
443-578 COCKEYSVL 4773 — Yes
443-579 ESSEX 829J — Yes
443-580 BALTIMORE 6855 2011-08-25 Yes
443-581 CHASE 876D — Yes
443-582 CHURCHVL 829J — Yes
443-583 COLUMBIA 829J — Yes
443-584 CROFTON 829J — Yes
443-585 DARLINGTON 829J — Yes
443-586 DUNDALK 2593 — Yes
443-587 EDGEWOOD 829J — Yes
443-588 PARKVILLE 7229 — Yes
443-589 COCKEYSVL 829J — Yes
443-590 REISTERSTN 6119 — Yes
443-591 GLENBURNIE 6395 2009-05-07 Yes
443-592 ELKRIDGE 2593 — Yes
443-593 ELKTON 829J — Yes
443-594 SPARROWSPT 6119 — Yes
443-595 SPARKSGLNC 071F — Yes
443-596 ESSEX 2593 — Yes
443-597 SEVERNA PK 5562 — Yes
443-598 SHERWD FOR 071F — Yes
443-599 SEVERN 5562 — 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.