All assignees
800 prefixes in 410 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 410-800 | BALTIMORE | 6395 | 2004-10-05 | Yes |
| 410-801 | BALTIMORE | 7228 | — | Yes |
| 410-802 | CATONSVL | 4036 | — | — |
| 410-803 | FORK | 9212 | — | Yes |
| 410-804 | BALTIMORE | 6395 | — | — |
| 410-805 | BALTIMORE | 6855 | 2011-08-25 | Yes |
| 410-806 | TOWSON | 6630 | — | — |
| 410-807 | CATONSVL | 7591 | — | Yes |
| 410-808 | FALLSTON | 5562 | — | Yes |
| 410-809 | BEL AIR | 829J | — | Yes |
| 410-810 | CHESTERTN | 9212 | — | Yes |
| 410-811 | XXXXXXXXXX | MULT | — | — |
| 410-812 | TOWSON | 4036 | — | — |
| 410-813 | WATERLO236 | 9212 | — | — |
| 410-814 | BALTIMORE | 829J | 2005-09-30 | Yes |
| 410-815 | WATERLO236 | 9212 | — | — |
| 410-816 | TOWSON | 6395 | — | Yes |
| 410-817 | FORK | 9212 | — | Yes |
| 410-818 | CATONSVL | 7325 | — | Yes |
| 410-819 | EASTON | 9212 | — | Yes |
| 410-820 | EASTON | 9212 | — | — |
| 410-821 | TOWSON | 9212 | — | — |
| 410-822 | EASTON | 9212 | — | — |
| 410-823 | TOWSON | 9212 | — | — |
| 410-824 | WATERLO236 | 7591 | — | Yes |
| 410-825 | TOWSON | 9212 | — | — |
| 410-826 | BALTIMORE | 876D | 2015-11-19 | Yes |
| 410-827 | QUEENSTOWN | 9212 | — | Yes |
| 410-828 | TOWSON | 9212 | — | — |
| 410-829 | EASTON | 6395 | — | Yes |
| 410-830 | TOWSON | 9212 | — | Yes |
| 410-831 | SALISBURY | 6855 | — | Yes |
| 410-832 | TOWSON | 9212 | — | Yes |
| 410-833 | REISTERSTN | 9212 | — | — |
| 410-834 | WATERLO236 | 508J | — | Yes |
| 410-835 | WILLARDS | 9212 | — | Yes |
| 410-836 | BEL AIR | 9212 | — | — |
| 410-837 | BALTIMORE | 9212 | — | — |
| 410-838 | BEL AIR | 9212 | — | — |
| 410-839 | TOWSON | 6630 | — | — |
| 410-840 | REISTERSTN | 9212 | — | Yes |
| 410-841 | SEVERNA PK | 9212 | — | Yes |
| 410-842 | TOWSON | 7228 | — | Yes |
| 410-843 | BALTIMORE | 7325 | — | — |
| 410-844 | BALTIMORE | 568G | 2011-09-30 | Yes |
| 410-845 | SALISBURY | 6855 | 2001-04-18 | Yes |
| 410-846 | SEVERN | 7228 | — | Yes |
| 410-847 | TOWSON | 9212 | — | Yes |
| 410-848 | WESTMINSTR | 9212 | — | — |
| 410-849 | SHERWD FOR | 9212 | — | Yes |
| 410-850 | GLENBURNIE | 9212 | — | — |
| 410-851 | TOWSON | 9212 | — | — |
| 410-852 | CATONSVL | 4036 | — | — |
| 410-853 | TOWSON | 9212 | — | Yes |
| 410-854 | WATERLO236 | 9212 | — | — |
| 410-855 | GLENBURNIE | 9212 | — | Yes |
| 410-856 | BALTIMORE | 9212 | — | Yes |
| 410-857 | WESTMINSTR | 9212 | — | — |
| 410-858 | ANNAPOLIS | 9212 | 2005-03-11 | Yes |
| 410-859 | GLENBURNIE | 9212 | — | — |
| 410-860 | SALISBURY | 9212 | — | — |
| 410-861 | WESTMINSTR | 9212 | — | Yes |
| 410-862 | WATERLO236 | 876D | — | Yes |
| 410-863 | GLENBURNIE | 9212 | — | Yes |
| 410-864 | BALTIMORE | 7228 | — | Yes |
| 410-865 | GLENBURNIE | 9212 | — | Yes |
| 410-866 | ESSEX | 9212 | — | — |
| 410-867 | WEST RIVER | 9212 | — | Yes |
| 410-868 | CATONSVL | 4036 | — | — |
| 410-869 | CATONSVL | 9212 | — | Yes |
| 410-870 | PARKVILLE | 318J | 2005-02-10 | Yes |
| 410-871 | WESTMINSTR | 9212 | — | Yes |
| 410-872 | COLUMBIA | 9212 | — | — |
| 410-873 | NANTICOKE | 9212 | — | Yes |
| 410-874 | ODENTON | 7228 | — | Yes |
| 410-875 | SYKESVILLE | 9212 | — | Yes |
| 410-876 | REISTERSTN | 9212 | — | — |
| 410-877 | FALLSTON | 9212 | — | Yes |
| 410-878 | BALTIMORE | 7228 | — | Yes |
| 410-879 | FORK | 9212 | — | — |
| 410-880 | WATERLO236 | 9212 | — | — |
| 410-881 | SHERWD FOR | 7228 | — | Yes |
| 410-882 | PARKVILLE | 9212 | — | — |
| 410-883 | SHARPTOWN | 9212 | — | Yes |
| 410-884 | COLUMBIA | 9212 | — | — |
| 410-885 | CHESAPKECY | 9212 | — | Yes |
| 410-886 | TILGHMAN | 9212 | — | Yes |
| 410-887 | TOWSON | 9212 | — | — |
| 410-888 | WATERLO236 | 9212 | — | Yes |
| 410-889 | BALTIMORE | 9212 | — | — |
| 410-890 | TOWSON | 6630 | — | — |
| 410-891 | COCKEYSVL | 7228 | — | Yes |
| 410-892 | GLENBURNIE | 9212 | — | Yes |
| 410-893 | FORK | 9212 | — | — |
| 410-894 | TOWSON | 6630 | — | — |
| 410-895 | BALTIMORE | 9212 | — | — |
| 410-896 | DELMAR | 9212 | — | Yes |
| 410-897 | ANNAPOLIS | 9212 | — | Yes |
| 410-898 | WATERLO236 | 9212 | — | — |
| 410-899 | TOWSON | 6630 | — | — |
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.