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
443-700 — —
443-701 ARBUTUS 7229 — Yes
443-702 ARGRGBSNIS 829J 2001-05-10 Yes
443-703 BALTIMORE 7229 — Yes
443-704 ODENTON 829J 2001-05-10 Yes
443-705 COCKEYSVL 6395 — Yes
443-706 CRISFIELD 829J — Yes
443-707 ABERDEEN 6855 — Yes
443-708 BALTIMORE 7591 — Yes
443-709 ARBUTUS 829J — Yes
443-710 CATONSVL 7229 — Yes
443-711 XXXXXXXXXX MULT — —
443-712 REISTERSTN 829J — Yes
443-713 GLENBURNIE 568G 2012-09-19 Yes
443-714 ANNAPOLIS 4036 — Yes
443-715 NORTH EAST 829J — Yes
443-716 ANNAPOLIS 829J — Yes
443-717 BALTIMORE 6395 2005-09-14 Yes
443-718 COLUMBIA 829J 2008-03-05 Yes
443-719 JARRETTSVL 829J — Yes
443-720 ABERDEEN 7229 2012-11-27 Yes
443-721 BALTIMORE 6395 2009-07-06 Yes
443-722 BALTIMORE 6855 2001-03-09 —
443-723 BALTIMORE 6855 2011-10-06 Yes
443-724 EASTON 829J — Yes
443-725 PARKVILLE 829J — Yes
443-726 BALTIMORE 6855 2011-10-06 Yes
443-727 BISHOPVL 829J — Yes
443-728 BERLIN 829J — Yes
443-729 WOODLAWN 829J — Yes
443-730 ESSEX 829J — Yes
443-731 PT DEPOSIT 7325 — Yes
443-732 SILVER RUN 7325 — Yes
443-733 WATERLO238 7325 — Yes
443-734 SEVERN 9212 — Yes
443-735 SALISBURY 4036 — —
443-736 SALISBURY 4036 — Yes
443-737 WATERLO238 829J — Yes
443-738 PIKESVILLE 829J — Yes
443-739 BALTIMORE 6855 2001-07-23 —
443-740 BALTIMORE 6119 2005-02-03 Yes
443-741 COLUMBIA 7228 2011-03-29 Yes
443-742 BALTIMORE 4036 — —
443-743 BALTIMORE 6395 2008-04-07 Yes
443-744 REISTERSTN 5562 2002-07-02 Yes
443-745 COLUMBIA 6395 — —
443-746 EASTON 6119 2002-02-22 Yes
443-747 PT DEPOSIT 2593 2002-02-22 Yes
443-748 MILLERSVL 829J 2001-05-11 Yes
443-749 GLENBURNIE 829J — Yes
443-750 BALTIMORE 6395 2010-06-08 Yes
443-751 WOODLAWN 829J 2001-05-11 Yes
443-752 BEL AIR 6395 2001-10-17 Yes
443-753 WATERLO236 7229 — Yes
443-754 SALISBURY 6395 2010-06-09 Yes
443-755 WATERLO238 9212 — Yes
443-756 BALTIMORE 4036 — —
443-757 ELKRIDGE 829J 2001-05-11 Yes
443-758 ANNAPOLIS 6395 — Yes
443-759 BALTIMORE 6395 2007-10-29 Yes
443-760 ABERDEEN 7421 — Yes
443-761 TOWSON 6855 2008-05-28 Yes
443-762 BALTIMORE 6855 2001-01-10 Yes
443-763 GLENBURNIE 6855 — Yes
443-764 GLENBURNIE 6855 2008-08-21 Yes
443-765 CATONSVL 4036 2001-07-23 Yes
443-766 COLUMBIA 829J 2005-05-18 Yes
443-767 WORTHINGTN 829J 2001-05-11 Yes
443-768 BALTIMORE 6855 2001-05-18 Yes
443-769 BALTIMORE 6855 2008-09-16 Yes
443-770 ARGRGBSNIS 9212 — Yes
443-771 PRINCEFRCK 6395 2010-09-08 Yes
443-772 ESSEX 829J 2001-07-23 Yes
443-773 BRYNPKLNCM 7229 — Yes
443-774 COLUMBIA 4036 2018-11-19 Yes
443-775 ANNAPOLIS 6395 2014-10-08 Yes
443-776 ELKRIDGE 071F 2014-01-17 Yes
443-777 ESSEX 9212 — Yes
443-778 WATERLO236 9212 — Yes
443-779 ABERDEEN 7229 — Yes
443-780 WOODLAWN 829J 2001-07-23 Yes
443-781 ARGRGBSNIS 876D — Yes
443-782 ANNAPOLIS 7229 — Yes
443-783 SALISBURY 6395 — —
443-784 ARGRGBSNIS 7325 — Yes
443-785 ARBUTUS 876D — —
443-786 EASTON 6395 — Yes
443-787 BEL AIR 829J — Yes
443-788 ABERDEEN 6855 — Yes
443-789 WESTMINSTR 4036 — Yes
443-790 GLENBURNIE 6855 2001-11-19 Yes
443-791 TOWSON 4036 — Yes
443-792 BRYNPKLNCM 9212 2007-10-18 Yes
443-793 PARKVILLE 7229 — Yes
443-794 BALTIMORE 4036 — —
443-795 SEVERN 7229 — Yes
443-796 PIKESVILLE 7229 — Yes
443-797 TOWSON 7229 — Yes
443-798 TOWSON 7591 — Yes
443-799 BALTIMORE 4036 2001-07-23 —

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.