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
443-900 TOWSON 6395 2012-05-23 Yes
443-901 TOWSON 829J 2001-08-21 Yes
443-902 BALTIMORE 6395 2011-01-06 Yes
443-903 BEL AIR 6395 2011-09-07 Yes
443-904 BALTIMORE 6395 2001-10-17 Yes
443-905 ANNAPOLIS 4036 — Yes
443-906 SEVERNA PK 568G 2012-09-20 Yes
443-907 ELKTON 6395 2001-04-20 Yes
443-908 BALTIMORE 6395 2011-06-29 Yes
443-909 BALTIMORE 6395 2006-08-09 Yes
443-910 BEL AIR 4036 2001-04-20 Yes
443-911 XXXXXXXXXX MULT — —
443-912 TOWSON 2593 2002-07-02 Yes
443-913 BALTIMORE 6855 2011-06-30 Yes
443-914 WORTHINGTN 7325 — Yes
443-915 BALTIMORE 6395 2011-09-07 Yes
443-916 BALTIMORE 6855 2011-08-22 Yes
443-917 COLUMBIA 876D 2011-10-07 Yes
443-918 TANEYTOWN 7325 — Yes
443-919 BALTIMORE 829J — —
443-920 SYKESVILLE 7325 — Yes
443-921 TOWSON 829J — Yes
443-922 EDGEWOOD 829J 2006-02-07 Yes
443-923 BALTIMORE 829J 2001-05-11 —
443-924 ANNAPOLIS 6395 2009-07-06 Yes
443-925 BALTIMORE 6855 2006-02-24 Yes
443-926 ANNAPOLIS 6119 — Yes
443-927 BALTIMORE 6119 — Yes
443-928 BALTIMORE 6395 2001-09-24 Yes
443-929 PIKESVILLE 6855 2001-04-20 Yes
443-930 BALTIMORE 6395 2011-04-06 Yes
443-931 BALTIMORE 7228 2011-10-24 Yes
443-932 BALTIMORE 6855 2011-08-22 Yes
443-933 COCKEYSVL 7325 2004-04-20 Yes
443-934 BALTIMORE 6395 2007-12-04 Yes
443-935 TOWSON 4036 2006-07-31 Yes
443-936 ELKRIDGE 4036 2017-02-23 Yes
443-937 UNION BDG 7325 — Yes
443-938 BALTIMORE 6395 2007-08-06 Yes
443-939 BALTIMORE 6855 2002-09-23 Yes
443-940 PIKESVILLE 829J 2001-08-21 Yes
443-941 ELKTON 4036 2011-09-07 Yes
443-942 SEVERNA PK 7325 — Yes
443-943 SPARROWSPT 7325 — Yes
443-944 SALISBURY 318J 2006-06-08 Yes
443-945 ELKTON 4036 2002-07-02 Yes
443-946 PARKVILLE 2593 — Yes
443-947 PERRYVILLE 829J — Yes
443-948 BALTIMORE 6855 2011-08-22 Yes
443-949 ANNAPOLIS 318J 2006-06-28 Yes
443-950 — —
443-951 ANNAPOLIS 6119 — Yes
443-952 WESTMINSTR 6395 2011-09-07 Yes
443-953 SALISBURY 6395 2011-09-07 Yes
443-954 BALTIMORE 829J 2005-07-06 Yes
443-955 BALTIMORE 6395 2006-03-13 Yes
443-956 BALTIMORE 4036 — —
443-957 BALTIMORE 7421 — Yes
443-958 — —
443-959 — —
443-960 GLENBURNIE 6395 2011-10-07 Yes
443-961 BALTIMORE 820C 2014-12-23 Yes
443-962 GLENBURNIE 6395 2007-09-14 Yes
443-963 BALTIMORE 071F — Yes
443-964 NORTHBEACH 6119 2006-05-12 Yes
443-965 BALTIMORE 6855 2006-06-21 Yes
443-966 FALLSTON 6395 2006-09-13 Yes
443-967 NORTH EAST 9212 2001-04-20 Yes
443-968 PRINCEFRCK 4036 — Yes
443-969 ESSEX 829J 2001-05-11 Yes
443-970 BALTIMORE 6395 2011-11-21 Yes
443-971 TANEYTOWN 071F 2011-02-16 Yes
443-972 CAMBRIDGE 829J 2011-11-21 Yes
443-973 ELLICOTTCY 7229 — Yes
443-974 WESTMINSTR 7325 — Yes
443-975 PRINCEFRCK 4036 — Yes
443-976 XXXXXXXXXX MULT — —
443-977 BALTIMORE 6395 2006-10-12 Yes
443-978 SALISBURY 6395 2011-11-21 Yes
443-979 COLUMBIA 6395 2011-11-21 Yes
443-980 CATONSVL 4036 — Yes
443-981 FALLSTON 6395 2011-11-21 Yes
443-982 BALTIMORE 281E 2007-05-30 Yes
443-983 BALTIMORE 6855 2002-07-02 Yes
443-984 BALTIMORE 9212 — —
443-985 RANDALLSTN 6855 2001-06-20 Yes
443-986 BALTIMORE 6395 2006-07-13 Yes
443-987 BEL AIR 6395 — Yes
443-988 CENTREVL 6119 2006-06-08 Yes
443-989 GLENBURNIE 829J 2001-05-11 Yes
443-990 BALTIMORE 071F 2011-02-04 Yes
443-991 TOWSON 6395 2011-12-01 Yes
443-992 BALTIMORE 6119 — Yes
443-993 ELKTON 5562 2010-12-13 Yes
443-994 ANNAPOLIS 4036 — —
443-995 ANNAPOLIS 4036 — —
443-996 CATONSVL 4036 — —
443-997 BALTIMORE 9212 — —
443-998 PARKVILLE 9212 2001-03-19 Yes
443-999 BALTIMORE 9212 — —

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.