All assignees
596 prefixes in 231 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 231-688 | MERRITT | 965H | 2020-02-19 | Yes |
| 231-689 | WHITECLOUD | 9323 | — | Yes |
| 231-690 | LUDINGTON | 6003 | 2002-07-19 | — |
| 231-695 | HOWARDCITY | 817J | 2001-07-11 | — |
| 231-699 | FOUNTAIN | 516J | 2022-02-22 | Yes |
| 231-700 | — | — | ||
| 231-707 | NEWAYGO | 543C | 2016-02-25 | Yes |
| 231-709 | TRAVERSECY | 6534 | — | Yes |
| 231-711 | XXXXXXXXXX | MULT | — | — |
| 231-712 | MUSKEGON | 9748 | — | — |
| 231-714 | TRAVERSECY | 6003 | — | Yes |
| 231-715 | TRAVERSECY | 6534 | — | Yes |
| 231-719 | MUSKEGON | 0695 | — | Yes |
| 231-720 | MUSKEGON | 0695 | — | Yes |
| 231-721 | HART | 2550 | 2002-08-27 | Yes |
| 231-722 | MUSKEGON | 0695 | — | — |
| 231-723 | MANISTEE | 9323 | — | — |
| 231-724 | MUSKEGON | 0695 | — | Yes |
| 231-725 | MUSKEGON | 0695 | — | Yes |
| 231-726 | MUSKEGON | 0695 | — | Yes |
| 231-727 | MUSKEGON | 0695 | — | — |
| 231-728 | MUSKEGON | 0695 | — | — |
| 231-729 | IRONS | 6534 | 2002-08-30 | Yes |
| 231-730 | MUSKEGON | 6534 | — | — |
| 231-731 | SHELBY | 2550 | — | — |
| 231-732 | MORLEY | 624H | — | Yes |
| 231-733 | MUSKEGON | 0695 | — | — |
| 231-734 | EVART | 9323 | — | Yes |
| 231-735 | TRAVERSECY | 6003 | 2001-06-18 | Yes |
| 231-736 | MUSKEGON | 0695 | — | Yes |
| 231-737 | MUSKEGON | 0695 | — | — |
| 231-739 | MUSKEGON | 0695 | — | — |
| 231-740 | MUSKEGON | 6003 | — | — |
| 231-742 | HART | 6534 | — | Yes |
| 231-743 | MARION | 9323 | — | Yes |
| 231-744 | MUSKEGON | 0695 | — | — |
| 231-745 | BALDWIN | 9323 | — | Yes |
| 231-746 | CHEBOYGAN | 516J | 2022-02-18 | Yes |
| 231-747 | MUSKEGON | 0695 | — | Yes |
| 231-750 | MUSKEGON | 6534 | — | — |
| 231-751 | WALLOON LK | 543C | 2014-10-06 | Yes |
| 231-753 | PETOSKEY | 829J | 2001-06-18 | Yes |
| 231-755 | MUSKEGON | 0695 | — | — |
| 231-757 | SCOTTVILLE | 9323 | — | Yes |
| 231-758 | PETOSKEY | 2964 | — | Yes |
| 231-759 | MUSKEGON | 0695 | — | — |
| 231-760 | MUSKEGON | 0695 | — | Yes |
| 231-762 | AMBLE | 785G | — | — |
| 231-763 | AMBLE | 792K | 2019-04-19 | Yes |
| 231-764 | FIFE LAKE | 817J | 2001-08-31 | — |
| 231-766 | MUSKEGON | 0695 | — | Yes |
| 231-767 | MUSKEGON | 0695 | — | Yes |
| 231-768 | LE ROY | 9323 | — | Yes |
| 231-769 | MUSKEGON | 0695 | — | Yes |
| 231-771 | ELK RAPIDS | 543C | 2016-03-22 | Yes |
| 231-772 | WELLSTON | 516J | 2022-03-07 | Yes |
| 231-773 | MUSKEGON | 0695 | — | — |
| 231-774 | INTERLOCHN | 3535 | 2005-01-19 | Yes |
| 231-775 | CADILLAC | 9323 | — | — |
| 231-776 | PETOSKEY | 2550 | 2002-08-27 | — |
| 231-777 | MUSKEGON | 0695 | — | — |
| 231-778 | TRAVERSECY | 2550 | 2002-08-27 | — |
| 231-779 | CADILLAC | 9323 | — | — |
| 231-780 | MUSKEGON | 0695 | — | Yes |
| 231-782 | CHEBOYGAN | 2550 | 2002-08-27 | — |
| 231-786 | TRAVERSECY | 965H | 2021-03-24 | Yes |
| 231-787 | WHITECLOUD | 543C | 2014-11-07 | Yes |
| 231-788 | MUSKEGON | 0695 | — | Yes |
| 231-790 | FREESOIL | 829J | 2001-06-18 | Yes |
| 231-791 | REED CITY | 829J | 2001-05-18 | Yes |
| 231-792 | MANCELONA | 2550 | 2002-08-27 | — |
| 231-793 | WHITECLOUD | 516C | — | Yes |
| 231-794 | MANISTEE | 6534 | 2002-08-30 | Yes |
| 231-796 | BIG RAPIDS | 9323 | — | — |
| 231-797 | LUTHER | 9323 | — | Yes |
| 231-798 | MUSKEGON | 0695 | — | Yes |
| 231-799 | MUSKEGON | 0695 | — | Yes |
| 231-800 | LUTHER | 543C | 2017-10-02 | Yes |
| 231-803 | MORLEY | 6120 | 2001-05-18 | Yes |
| 231-805 | KALEVA | 3535 | 2005-01-19 | Yes |
| 231-806 | CORAL | 2550 | 2002-08-27 | — |
| 231-808 | CENTRAL LK | 2550 | 2002-08-12 | — |
| 231-810 | — | — | ||
| 231-811 | XXXXXXXXXX | MULT | — | — |
| 231-813 | LUDINGTON | 2550 | — | — |
| 231-818 | CHEBOYGAN | 6534 | — | Yes |
| 231-819 | TUSTIN | 543C | 2014-10-06 | Yes |
| 231-821 | HOLTON | 0695 | — | Yes |
| 231-822 | BEULAH | 817J | 2001-08-27 | — |
| 231-823 | STANWOOD | 0695 | — | Yes |
| 231-824 | MANTON | 9323 | — | Yes |
| 231-825 | MCBAIN | 9323 | — | Yes |
| 231-826 | FALMOUTH | 0705 | — | Yes |
| 231-828 | TWIN LAKE | 0695 | — | Yes |
| 231-829 | TUSTIN | 9323 | — | Yes |
| 231-830 | MUSKEGON | 0695 | — | Yes |
| 231-831 | EASTJORDAN | 543C | — | Yes |
| 231-832 | REED CITY | 9323 | — | — |
| 231-833 | WOLVERINE | 6534 | 2005-04-11 | Yes |
| 231-834 | GRANT | 9323 | — | 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.