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
443-600 ESSEX 6855 2001-07-23 Yes
443-601 FALLSTON 829J — Yes
443-602 BALTIMORE 6395 2007-02-15 Yes
443-603 ANNAPOLIS 829J — Yes
443-604 BALTIMORE 6395 — —
443-605 WESTMINSTR 829J — Yes
443-606 FORK 829J — Yes
443-607 WEST RIVER 829J — Yes
443-608 TOWSON 4036 2009-02-27 Yes
443-609 SYKESVILLE 829J — Yes
443-610 BALTIMORE 6395 — Yes
443-611 XXXXXXXXXX MULT — —
443-612 CATONSVL 9212 — —
443-613 TOWSON 4036 2009-02-27 Yes
443-614 SALISBURY 6395 2001-07-23 —
443-615 BALTIMORE 6395 2007-05-10 Yes
443-616 BEL AIR 829J — Yes
443-617 FALLSTON 6395 2005-04-11 Yes
443-618 GLENBURNIE 6395 — Yes
443-619 BEL AIR 6395 2009-06-05 Yes
443-620 WATERLO238 7325 — Yes
443-621 BALTIMORE 6855 — Yes
443-622 BALTIMORE 6855 — Yes
443-623 GLENBURNIE 6855 2002-08-20 Yes
443-624 PRINCEFRCK 6395 2002-03-06 Yes
443-625 FORK 6119 2001-02-21 Yes
443-626 CHASE 829J 2001-05-10 Yes
443-627 BALTIMORE 6119 — Yes
443-628 GLENBURNIE 2593 — Yes
443-629 BALTIMORE 6855 — Yes
443-630 BALTIMORE 6395 2008-05-08 Yes
443-631 CATONSVL 4036 2005-08-16 Yes
443-632 TOWSON 829J — Yes
443-633 BALTIMORE 6855 2011-07-18 Yes
443-634 WATERLO236 9212 2011-11-09 Yes
443-635 BALTIMORE 4036 2009-10-14 Yes
443-636 CATONSVL 6855 — Yes
443-637 ARGRGBSNIS 7229 2001-02-21 Yes
443-638 ELLICOTTCY 2554 — —
443-639 HAMPSTEAD 829J — Yes
443-640 BEL AIR 829J 2001-05-18 Yes
443-641 PIKESVILLE 6119 2001-05-18 Yes
443-642 BALTIMORE 6395 2006-11-08 Yes
443-643 BEL AIR 9212 — Yes
443-644 JARRETTSVL 829J — Yes
443-645 MILLERSVL 829J — Yes
443-646 NORTHBEACH 829J — Yes
443-647 NEWWINDSOR 829J — Yes
443-648 ESSEX 7325 — Yes
443-649 SPARROWSPT 829J 2001-06-20 Yes
443-650 REISTERSTN 7229 2001-02-20 Yes
443-651 BALTIMORE 6395 2011-07-08 Yes
443-652 TOWSON 6855 — Yes
443-653 PARKVILLE 6855 2001-05-18 Yes
443-654 WATERLO236 9212 2008-08-28 Yes
443-655 BEL AIR 4036 — Yes
443-656 COLUMBIA 829J 2001-05-10 Yes
443-657 RANDALLSTN 7591 — Yes
443-658 WOODLAWN 876D — —
443-659 WEST RIVER 876D — —
443-660 PIKESVILLE 318J — Yes
443-661 WATERLO238 829J — Yes
443-662 SPARKSGLNC 829J 2001-05-10 Yes
443-663 WOODLAWN 9212 — Yes
443-664 OCEAN CITY 829J — Yes
443-665 NANTICOKE 2593 — Yes
443-666 CHESTERTN 6119 2012-05-23 Yes
443-667 DELMAR 6395 2023-05-16 Yes
443-668 CATONSVL 4036 2001-01-15 Yes
443-669 DELMAR 829J — Yes
443-670 CATONSVL 829J 2001-05-10 Yes
443-671 NEWWINDSOR 7325 — Yes
443-672 PARKTON 7325 — Yes
443-673 BRYNPKLNCM 829J 2001-05-10 Yes
443-674 NORTH EAST 7325 — Yes
443-675 RANDALLSTN 829J — Yes
443-676 BALTIMORE 4036 2001-06-20 —
443-677 BALTIMORE 6855 2001-03-15 Yes
443-678 PARKVILLE 9212 — Yes
443-679 SEVERN 7325 — Yes
443-680 BALTIMORE 6855 2010-09-27 Yes
443-681 BALTIMORE 6395 2009-06-05 Yes
443-682 BALTIMORE 6395 2006-12-19 Yes
443-683 BALTIMORE 6395 2007-04-09 Yes
443-684 PRINCEFRCK 6395 2008-10-08 Yes
443-685 SEVERN 829J — Yes
443-686 FALLSTON 6395 — Yes
443-687 BALTIMORE 6395 2009-09-08 Yes
443-688 SEVERN 829J 2001-05-10 Yes
443-689 COCKEYSVL 829J 2001-05-10 Yes
443-690 BALTIMORE 6395 — —
443-691 BALTIMORE 4036 2001-01-15 —
443-692 BALTIMORE 7229 — Yes
443-693 PERRYVILLE 7325 — Yes
443-694 SEVERNA PK 5562 2001-04-20 Yes
443-695 BALTIMORE 6395 — —
443-696 DUNDALK 829J 2001-05-10 Yes
443-697 CATONSVL 2554 — —
443-698 ODENTON 7325 — Yes
443-699 ANNAPOLIS 6395 2011-08-10 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.