All assignees
800 prefixes in 410 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 410-600 | BERLIN | 7228 | 2006-04-25 | Yes |
| 410-601 | BALTIMORE | 9212 | — | Yes |
| 410-602 | PIKESVILLE | 9212 | — | — |
| 410-603 | SALISBURY | 4036 | — | — |
| 410-604 | STEVENSVL | 9212 | — | Yes |
| 410-605 | BALTIMORE | 9212 | — | — |
| 410-606 | WATERLO236 | 9212 | — | — |
| 410-607 | TOWSON | 6630 | — | — |
| 410-608 | CATONSVL | 4036 | — | Yes |
| 410-609 | BRYNPKLNCM | 9212 | — | Yes |
| 410-610 | PRINCEFRCK | 6395 | — | — |
| 410-611 | XXXXXXXXXX | MULT | — | — |
| 410-612 | EDGEWOOD | 9212 | — | Yes |
| 410-613 | BALTIMORE | 9212 | — | — |
| 410-614 | BALTIMORE | 9212 | — | — |
| 410-615 | CATONSVL | 4036 | — | — |
| 410-616 | TOWSON | 7228 | — | Yes |
| 410-617 | BALTIMORE | 9212 | — | Yes |
| 410-618 | PERRYVILLE | 228C | 2011-11-07 | Yes |
| 410-619 | WATERLO236 | 9748 | — | — |
| 410-620 | ELKTON | 9212 | — | Yes |
| 410-621 | PRINCEANNE | 9212 | — | Yes |
| 410-622 | BALTIMORE | 7228 | 2011-08-12 | Yes |
| 410-623 | MARION | 9212 | — | Yes |
| 410-624 | BALTIMORE | 9212 | — | Yes |
| 410-625 | BALTIMORE | 9212 | — | — |
| 410-626 | ANNAPOLIS | 9212 | — | Yes |
| 410-627 | BALTIMORE | 6395 | — | — |
| 410-628 | COCKEYSVL | 9212 | — | Yes |
| 410-629 | BERLIN | 9212 | — | Yes |
| 410-630 | CHASE | 7228 | — | Yes |
| 410-631 | BALTIMORE | 9212 | — | Yes |
| 410-632 | SNOW HILL | 9212 | — | Yes |
| 410-633 | BALTIMORE | 9212 | — | — |
| 410-634 | RIDGELY | 9212 | — | Yes |
| 410-635 | NEWWINDSOR | 9212 | — | Yes |
| 410-636 | BRYNPKLNCM | 9212 | — | — |
| 410-637 | BALTIMORE | 9212 | — | Yes |
| 410-638 | BEL AIR | 9212 | — | — |
| 410-639 | ROCK HALL | 9212 | — | Yes |
| 410-640 | BALTIMORE | 6630 | — | — |
| 410-641 | BERLIN | 9212 | — | — |
| 410-642 | PERRYVILLE | 9212 | — | Yes |
| 410-643 | STEVENSVL | 9212 | — | — |
| 410-644 | BALTIMORE | 9212 | — | — |
| 410-645 | WOODLAWN | 7228 | — | Yes |
| 410-646 | BALTIMORE | 9212 | — | Yes |
| 410-647 | SEVERNA PK | 9212 | — | — |
| 410-648 | GALENA | 9212 | — | Yes |
| 410-649 | BALTIMORE | 7325 | — | Yes |
| 410-650 | DUNDALK | 7229 | — | Yes |
| 410-651 | PRINCEANNE | 9212 | — | — |
| 410-652 | BEL AIR | 4036 | — | — |
| 410-653 | PIKESVILLE | 9212 | — | — |
| 410-654 | PIKESVILLE | 9212 | — | — |
| 410-655 | RANDALLSTN | 9212 | — | — |
| 410-656 | NORTH EAST | 420C | 2008-05-30 | Yes |
| 410-657 | PARKVILLE | 7228 | — | Yes |
| 410-658 | RISING SUN | 0216 | — | — |
| 410-659 | BALTIMORE | 9212 | — | — |
| 410-660 | ELKRIDGE | 5562 | 2006-07-31 | Yes |
| 410-661 | PARKVILLE | 9212 | — | — |
| 410-662 | BALTIMORE | 9212 | — | Yes |
| 410-663 | PARKVILLE | 9212 | — | — |
| 410-664 | BALTIMORE | 9212 | — | — |
| 410-665 | PARKVILLE | 9212 | — | — |
| 410-666 | COCKEYSVL | 9212 | — | — |
| 410-667 | COCKEYSVL | 9212 | — | — |
| 410-668 | PARKVILLE | 9212 | — | — |
| 410-669 | BALTIMORE | 9212 | — | — |
| 410-670 | EDGEWOOD | 7228 | — | Yes |
| 410-671 | EDGEWOOD | 9212 | — | Yes |
| 410-672 | ODENTON | 9212 | — | Yes |
| 410-673 | PRESTON | 9212 | — | Yes |
| 410-674 | ODENTON | 9212 | — | — |
| 410-675 | BALTIMORE | 9212 | — | — |
| 410-676 | EDGEWOOD | 9212 | — | — |
| 410-677 | SALISBURY | 9212 | — | — |
| 410-678 | ELKRIDGE | 6630 | — | — |
| 410-679 | FORK | 9212 | — | — |
| 410-680 | ELLICOTTCY | 7591 | — | Yes |
| 410-681 | TOWSON | 6630 | — | — |
| 410-682 | ESSEX | 9212 | — | Yes |
| 410-683 | COCKEYSVL | 9212 | — | Yes |
| 410-684 | GLENBURNIE | 9212 | — | Yes |
| 410-685 | BALTIMORE | 9212 | — | — |
| 410-686 | ESSEX | 9212 | — | — |
| 410-687 | ESSEX | 9212 | — | — |
| 410-688 | FALLSTON | 6395 | — | — |
| 410-689 | GLENBURNIE | 7325 | — | Yes |
| 410-690 | EASTON | 6119 | 2002-05-20 | Yes |
| 410-691 | GLENBURNIE | 9212 | — | Yes |
| 410-692 | JARRETTSVL | 9212 | — | Yes |
| 410-693 | ANNAPOLIS | 4036 | — | — |
| 410-694 | GLENBURNIE | 9212 | — | Yes |
| 410-695 | ODENTON | 9212 | — | Yes |
| 410-696 | ELLICOTTCY | 7228 | — | Yes |
| 410-697 | MILLERSVL | 7228 | — | Yes |
| 410-698 | FORK | 7228 | — | Yes |
| 410-699 | CHESTERTN | 6855 | 2002-07-23 | 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.