All assignees
800 prefixes in 410 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 410-900 | BALTIMORE | 829J | 2004-10-04 | Yes |
| 410-901 | CAMBRIDGE | 9212 | — | Yes |
| 410-902 | PIKESVILLE | 9212 | — | — |
| 410-903 | SEVERNA PK | 5562 | — | Yes |
| 410-904 | WATERLO238 | 7228 | — | Yes |
| 410-905 | BALTIMORE | 6855 | — | Yes |
| 410-906 | BALTIMORE | 9212 | — | — |
| 410-907 | WOODLAWN | 7228 | — | Yes |
| 410-908 | BALTIMORE | 6855 | — | Yes |
| 410-909 | ELKRIDGE | 6630 | — | — |
| 410-910 | COLUMBIA | 7228 | — | — |
| 410-911 | XXXXXXXXXX | MULT | — | — |
| 410-912 | SALISBURY | 829J | — | — |
| 410-913 | BALTIMORE | 6395 | — | — |
| 410-914 | CHURCHVL | 829J | — | Yes |
| 410-915 | BALTIMORE | 8697 | 2005-10-27 | — |
| 410-916 | BALTIMORE | 6395 | — | — |
| 410-917 | CATONSVL | 4036 | — | — |
| 410-918 | ESSEX | 9212 | — | Yes |
| 410-919 | ANNAPOLIS | 7228 | — | Yes |
| 410-920 | ELKTON | 4036 | — | — |
| 410-921 | SEVERN | 7591 | — | Yes |
| 410-922 | RANDALLSTN | 9212 | — | — |
| 410-923 | MILLERSVL | 9212 | — | — |
| 410-924 | EASTON | 6395 | — | — |
| 410-925 | BALTIMORE | 6395 | — | — |
| 410-926 | CATONSVL | 4036 | — | Yes |
| 410-927 | ODENTON | 7591 | — | Yes |
| 410-928 | MILLINGTON | 9212 | — | Yes |
| 410-929 | BALTIMORE | 071F | 2008-05-13 | Yes |
| 410-930 | WATERLO236 | 6810 | — | — |
| 410-931 | PARKVILLE | 9212 | — | — |
| 410-932 | ELKRIDGE | 6630 | — | — |
| 410-933 | PARKVILLE | 9212 | — | — |
| 410-934 | ANNAPOLIS | 4036 | 2012-01-27 | Yes |
| 410-935 | BALTIMORE | 6395 | — | — |
| 410-936 | SALISBURY | 318J | 2019-06-04 | Yes |
| 410-937 | FALLSTON | 6395 | — | — |
| 410-938 | TOWSON | 9212 | — | Yes |
| 410-939 | HAVREGRACE | 9212 | — | — |
| 410-940 | ANNAPOLIS | 829J | 2002-01-22 | Yes |
| 410-941 | JARRETTSVL | 9212 | 2001-08-21 | Yes |
| 410-942 | HAVREGRACE | 9212 | — | Yes |
| 410-943 | HURLOCK | 9212 | — | Yes |
| 410-944 | WOODLAWN | 9212 | — | — |
| 410-945 | BALTIMORE | 9212 | — | — |
| 410-946 | SEVERNA PK | 9212 | — | Yes |
| 410-947 | BALTIMORE | 9212 | — | — |
| 410-948 | CATONSVL | 4036 | — | Yes |
| 410-949 | BALTIMORE | 7228 | — | Yes |
| 410-950 | — | — | ||
| 410-951 | BALTIMORE | 7325 | — | — |
| 410-952 | BALTIMORE | 6395 | — | — |
| 410-953 | COLUMBIA | 9212 | — | Yes |
| 410-954 | BALTIMORE | 9212 | — | — |
| 410-955 | BALTIMORE | 9212 | — | — |
| 410-956 | ANNAPOLIS | 9212 | — | — |
| 410-957 | POCOMOKE | 9212 | — | Yes |
| 410-958 | — | — | ||
| 410-959 | — | — | ||
| 410-960 | BALTIMORE | 6395 | — | — |
| 410-961 | BALTIMORE | 6855 | — | Yes |
| 410-962 | BALTIMORE | 9212 | — | — |
| 410-963 | BALTIMORE | 6855 | — | Yes |
| 410-964 | COLUMBIA | 9212 | — | — |
| 410-965 | WOODLAWN | 9212 | — | — |
| 410-966 | WOODLAWN | 9212 | — | — |
| 410-967 | TOWSON | 4036 | — | — |
| 410-968 | CRISFIELD | 9212 | — | Yes |
| 410-969 | SEVERN | 9212 | — | — |
| 410-970 | SYKESVILLE | 7228 | — | Yes |
| 410-971 | CATONSVL | 4036 | — | — |
| 410-972 | ANNAPOLIS | 7325 | — | Yes |
| 410-973 | BERLIN | 861F | 2010-06-23 | Yes |
| 410-974 | SEVERNA PK | 9212 | — | — |
| 410-975 | SEVERNA PK | 9212 | — | Yes |
| 410-976 | BALTIMORE | MULT | — | — |
| 410-977 | BALTIMORE | 6855 | — | Yes |
| 410-978 | CATONSVL | 4036 | — | — |
| 410-979 | CATONSVL | 4036 | — | — |
| 410-980 | ANNAPOLIS | 6395 | — | Yes |
| 410-981 | GLENBURNIE | 9212 | — | Yes |
| 410-982 | BALTIMORE | 2596 | 2003-10-13 | Yes |
| 410-983 | FORK | 9212 | — | Yes |
| 410-984 | SYKESVILLE | 5562 | — | Yes |
| 410-985 | WATERLO236 | 8697 | — | — |
| 410-986 | BALTIMORE | 9212 | — | — |
| 410-987 | SEVERN | 9212 | — | — |
| 410-988 | ELLICOTTCY | 9212 | — | Yes |
| 410-989 | FORK | 9212 | — | Yes |
| 410-990 | ANNAPOLIS | 9212 | — | — |
| 410-991 | ANNAPOLIS | 6395 | — | — |
| 410-992 | COLUMBIA | 9212 | — | Yes |
| 410-993 | GLENBURNIE | 9212 | — | — |
| 410-994 | EDGEWOOD | 9212 | — | Yes |
| 410-995 | ELLICOTTCY | 9212 | — | Yes |
| 410-996 | ELKTON | 9212 | — | Yes |
| 410-997 | COLUMBIA | 9212 | — | — |
| 410-998 | PIKESVILLE | 9212 | — | Yes |
| 410-999 | GLENBURNIE | 8697 | 2003-06-09 | 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.