All assignees
800 prefixes in 303 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 303-800 | DENVER | 6118 | — | — |
| 303-801 | DENVER | 7229 | — | Yes |
| 303-802 | DENVER | 4574 | — | Yes |
| 303-803 | DENVER | 4574 | — | Yes |
| 303-804 | DENVER | 9636 | — | — |
| 303-805 | DENVER | 9636 | — | — |
| 303-806 | DENVER | 9636 | — | — |
| 303-807 | DENVER | 6010 | — | — |
| 303-808 | DENVER | 6010 | — | — |
| 303-809 | DENVER | 6010 | — | — |
| 303-810 | DENVER | 6010 | — | — |
| 303-811 | XXXXXXXXXX | MULT | — | — |
| 303-812 | DENVER | 9636 | — | — |
| 303-813 | DENVER | 9636 | — | — |
| 303-814 | DENVER | 9636 | — | — |
| 303-815 | DENVER | 5972 | 2005-02-03 | Yes |
| 303-816 | DECKERS | 9636 | — | Yes |
| 303-817 | DENVER | 6567 | — | — |
| 303-818 | DENVER | 6567 | — | — |
| 303-819 | DENVER | 6567 | — | — |
| 303-820 | DENVER | 9636 | — | — |
| 303-821 | DENVER | 6630 | — | — |
| 303-822 | BYERS | 2181 | — | — |
| 303-823 | ALLNSPKLYN | 9636 | — | Yes |
| 303-824 | DENVER | 7378 | — | Yes |
| 303-825 | DENVER | 9636 | — | — |
| 303-826 | DENVER | 6630 | — | — |
| 303-827 | LONGMONT | 6118 | — | Yes |
| 303-828 | DENVER | 9636 | — | Yes |
| 303-829 | DENVER | 6567 | — | — |
| 303-830 | DENVER | 9636 | — | Yes |
| 303-831 | DENVER | 9636 | — | — |
| 303-832 | DENVER | 9636 | — | — |
| 303-833 | DENVER | 9636 | — | — |
| 303-834 | LONGMONT | 6567 | 2006-09-27 | Yes |
| 303-835 | DENVER | 6118 | — | Yes |
| 303-836 | DENVER | 6907 | — | — |
| 303-837 | DENVER | 9636 | — | — |
| 303-838 | DECKERS | 9636 | — | — |
| 303-839 | DENVER | 9636 | — | — |
| 303-840 | DENVER | 9636 | — | — |
| 303-841 | DENVER | 9636 | — | — |
| 303-842 | DENVER | 6567 | — | Yes |
| 303-843 | DENVER | 9636 | — | — |
| 303-844 | DENVER | 9636 | — | — |
| 303-845 | LONGMONT | 7378 | — | Yes |
| 303-846 | DENVER | 9636 | — | — |
| 303-847 | DENVER | 6118 | — | Yes |
| 303-848 | LONGMONT | 6118 | — | Yes |
| 303-849 | ROGGEN | 2202 | — | — |
| 303-850 | DENVER | 9636 | — | — |
| 303-851 | DENVER | 6630 | — | — |
| 303-852 | DENVER | 6630 | — | — |
| 303-853 | DENVER | 9636 | — | — |
| 303-854 | DENVER | 6118 | — | Yes |
| 303-855 | DENVER | 6630 | — | — |
| 303-856 | DENVER | 6118 | — | Yes |
| 303-857 | FORTLUPTON | 9636 | — | Yes |
| 303-858 | DENVER | 9636 | — | — |
| 303-859 | DENVER | 6567 | — | Yes |
| 303-860 | DENVER | 9636 | — | — |
| 303-861 | DENVER | 9636 | — | — |
| 303-862 | DENVER | 318J | 2005-06-04 | Yes |
| 303-863 | DENVER | 9636 | — | — |
| 303-864 | DENVER | 9636 | — | — |
| 303-865 | DENVER | 6118 | — | Yes |
| 303-866 | DENVER | 9636 | — | — |
| 303-867 | DENVER | 881B | 2005-11-04 | Yes |
| 303-868 | DENVER | 6567 | — | — |
| 303-869 | DENVER | 9636 | — | — |
| 303-870 | DENVER | 6567 | — | — |
| 303-871 | DENVER | 9636 | — | — |
| 303-872 | DENVER | 6118 | — | Yes |
| 303-873 | DENVER | 9636 | — | — |
| 303-874 | DENVER | 6118 | — | Yes |
| 303-875 | DENVER | 6529 | — | — |
| 303-876 | DENVER | 7229 | — | — |
| 303-877 | DENVER | 6567 | — | — |
| 303-878 | DENVER | 6630 | — | — |
| 303-879 | DENVER | 026D | 2023-08-15 | Yes |
| 303-880 | DENVER | 6567 | — | — |
| 303-881 | DENVER | 6010 | — | — |
| 303-882 | DENVER | 6010 | — | — |
| 303-883 | DENVER | 6010 | — | — |
| 303-884 | DENVER | 6010 | — | — |
| 303-885 | DENVER | 6010 | 2001-04-12 | — |
| 303-886 | DENVER | 6010 | 2001-04-12 | — |
| 303-887 | DENVER | 6010 | 2001-04-12 | — |
| 303-888 | DENVER | 6010 | — | — |
| 303-889 | DENVER | 9636 | — | Yes |
| 303-890 | DENVER | 6630 | — | — |
| 303-891 | DENVER | 6630 | — | — |
| 303-892 | DENVER | 9636 | — | — |
| 303-893 | DENVER | 9636 | — | — |
| 303-894 | DENVER | 9636 | — | — |
| 303-895 | DENVER | 6567 | — | Yes |
| 303-896 | DENVER | 9636 | — | — |
| 303-897 | DENVER | 6630 | — | — |
| 303-898 | DENVER | 6010 | — | — |
| 303-899 | DENVER | 9636 | — | — |
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.