All assignees
800 prefixes in 203 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 203-700 | — | — | ||
| 203-701 | MILFORD | 7421 | — | Yes |
| 203-702 | DANBURY | 829J | — | Yes |
| 203-703 | STAMFORD | 9147 | — | Yes |
| 203-704 | WOLCOTT | 4800 | 2002-07-17 | Yes |
| 203-705 | STAMFORD | 7230 | — | Yes |
| 203-706 | WATERBURY | 829J | 2004-02-12 | Yes |
| 203-707 | WATERBURY | 6388 | 2011-03-10 | Yes |
| 203-708 | STAMFORD | 9147 | — | Yes |
| 203-709 | WATERBURY | 9147 | — | Yes |
| 203-710 | NEW HAVEN | 4036 | — | — |
| 203-711 | XXXXXXXXXX | MULT | — | — |
| 203-712 | HUNTINGTON | 4800 | — | Yes |
| 203-713 | MILFORD | 639C | — | Yes |
| 203-714 | NAUGATUCK | 624H | — | Yes |
| 203-715 | MERIDEN | 6624 | — | Yes |
| 203-716 | NEW CANAAN | 4800 | — | Yes |
| 203-717 | GREENWICH | 612K | 2011-01-28 | Yes |
| 203-718 | CHESHIRE | 4800 | — | Yes |
| 203-719 | STAMFORD | 7230 | — | — |
| 203-720 | NAUGATUCK | 9147 | — | Yes |
| 203-721 | WATERBURY | 6388 | — | Yes |
| 203-722 | NORWALK | 4036 | — | — |
| 203-723 | NAUGATUCK | 9147 | — | Yes |
| 203-724 | STAMFORD | 829J | — | Yes |
| 203-725 | WATERBURY | 318J | — | Yes |
| 203-726 | BRIDGEPORT | 6388 | 2010-09-08 | Yes |
| 203-727 | BRIDGEPORT | 6624 | 2001-06-05 | Yes |
| 203-728 | STAMFORD | 9147 | 2006-11-22 | Yes |
| 203-729 | NAUGATUCK | 9147 | — | — |
| 203-730 | DANBURY | 9147 | — | — |
| 203-731 | DANBURY | 9147 | — | Yes |
| 203-732 | ANSONIDRBY | 9147 | — | — |
| 203-733 | DANBURY | 6388 | — | — |
| 203-734 | ANSONIDRBY | 9147 | — | — |
| 203-735 | ANSONIDRBY | 9147 | — | — |
| 203-736 | ANSONIDRBY | 9147 | — | Yes |
| 203-737 | NEW HAVEN | 9147 | — | Yes |
| 203-738 | GUILFORD | 829J | — | Yes |
| 203-739 | DANBURY | 9147 | — | Yes |
| 203-740 | DANBURY | 9147 | — | — |
| 203-741 | WALLINGFD | 9147 | — | Yes |
| 203-742 | GREENWICH | 7230 | 2003-04-10 | Yes |
| 203-743 | DANBURY | 9147 | — | — |
| 203-744 | DANBURY | 9147 | — | Yes |
| 203-745 | NEW HAVEN | 9147 | — | Yes |
| 203-746 | DANBURY | 9147 | — | — |
| 203-747 | NEW HAVEN | 7143 | — | Yes |
| 203-748 | DANBURY | 9147 | — | — |
| 203-749 | DANBURY | 9147 | — | — |
| 203-750 | NORWALK | 9147 | — | — |
| 203-751 | ANSONIDRBY | 9147 | — | Yes |
| 203-752 | NEW HAVEN | 9147 | — | Yes |
| 203-753 | WATERBURY | 9147 | — | — |
| 203-754 | WATERBURY | 9147 | — | — |
| 203-755 | WATERBURY | 9147 | — | — |
| 203-756 | WATERBURY | 9147 | — | — |
| 203-757 | WATERBURY | 9147 | — | — |
| 203-758 | WATERBURY | 9147 | — | — |
| 203-759 | WATERBURY | 9147 | — | Yes |
| 203-760 | BRIDGEPORT | 539F | 2012-04-16 | Yes |
| 203-761 | WILTON | 9147 | — | — |
| 203-762 | WILTON | 9147 | — | Yes |
| 203-763 | FAIRFIELD | 4800 | — | Yes |
| 203-764 | NEW HAVEN | 9147 | — | Yes |
| 203-765 | NEW HAVEN | 9147 | — | — |
| 203-766 | NEW HAVEN | 9748 | — | — |
| 203-767 | BRIDGEPORT | 6388 | — | — |
| 203-768 | WATERBURY | 6624 | — | — |
| 203-769 | GREENWICH | 9104 | — | Yes |
| 203-770 | DANBURY | 4036 | — | — |
| 203-771 | NEW HAVEN | 9147 | — | — |
| 203-772 | NEW HAVEN | 9147 | — | Yes |
| 203-773 | NEW HAVEN | 9147 | — | — |
| 203-774 | WALLINGFD | 829J | — | Yes |
| 203-775 | DANBURY | 9147 | — | — |
| 203-776 | NEW HAVEN | 9147 | — | — |
| 203-777 | NEW HAVEN | 9147 | — | — |
| 203-778 | DANBURY | 9147 | — | — |
| 203-779 | MADISON | 829J | — | Yes |
| 203-780 | NEW HAVEN | 539F | 2012-10-02 | Yes |
| 203-781 | NEW HAVEN | 9147 | — | Yes |
| 203-782 | NEW HAVEN | 9147 | — | — |
| 203-783 | MILFORD | 9147 | — | — |
| 203-784 | NEW HAVEN | 9147 | — | — |
| 203-785 | NEW HAVEN | 9147 | — | — |
| 203-786 | NEW HAVEN | 9147 | — | — |
| 203-787 | NEW HAVEN | 9147 | — | Yes |
| 203-788 | DANBURY | 4036 | — | — |
| 203-789 | NEW HAVEN | 9147 | — | — |
| 203-790 | DANBURY | 9147 | — | — |
| 203-791 | DANBURY | 9147 | — | — |
| 203-792 | DANBURY | 9147 | — | — |
| 203-793 | WALLINGFD | 4800 | 2001-03-23 | Yes |
| 203-794 | DANBURY | 9147 | — | Yes |
| 203-795 | NEW HAVEN | 9147 | — | — |
| 203-796 | DANBURY | 9147 | — | — |
| 203-797 | DANBURY | 9147 | — | — |
| 203-798 | DANBURY | 9147 | — | — |
| 203-799 | NEW HAVEN | 9147 | — | — |
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.