Rock Hall, MD — rate center
Phone numbers "from Rock Hall" are, precisely speaking, numbers whose prefixes are anchored to the Rock Hall rate center of Maryland, under 410, 667.
NANPA records show 3 active prefixes here across 3 carriers. 3 prefixes participate in thousands-block pooling, so blocks of 1,000 numbers are shared between carriers.
Routing-wise it sits in LATA 242.
Multiple area codes over one rate center (410/667) is the overlay pattern: same geography, different first three digits.
With only 3 prefixes, Rock Hall sits at the small end of Maryland's rate centers — a handful of carrier blocks cover the whole locality, and a number from here is a fairly strong locality signal (before porting is considered).
As always with US numbering: a prefix anchored to Rock Hall tells you where the block was issued. The person calling may have ported the number, moved away, or be spoofing it entirely — verify callers through independently found contact details.
Prefixes anchored to Rock Hall
| Prefix | Code holder | Pooled |
|---|---|---|
| 410-639 | VERIZON MARYLAND, INC. | Yes |
FAQ
What area code is Rock Hall, MD?
Rock Hall is served by 2 area codes — 410, 667 — which overlay the same territory.
How many prefixes does Rock Hall have?
3 active NXX prefixes are anchored to this rate center in NANPA records, held by 3 carriers.
Is a call from a Rock Hall prefix really from Rock Hall?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.