Preston, MD — rate center
Phone numbers "from Preston" are, precisely speaking, numbers whose prefixes are anchored to the Preston rate center of Maryland, under 410, 667.
The rate center currently carries 4 working prefixes across 4 carriers. 4 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 4 prefixes, Preston 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).
A Preston prefix on caller ID is a starting point, not proof of origin — numbers travel with their owners and displays can be spoofed. Use official callback numbers for anything sensitive.
Prefixes anchored to Preston
| Prefix | Code holder | Pooled |
|---|---|---|
| 410-673 | VERIZON MARYLAND, INC. | Yes |
FAQ
What area code is Preston, MD?
Preston is served by 2 area codes — 410, 667 — which overlay the same territory.
How many prefixes does Preston have?
4 active NXX prefixes are anchored to this rate center in NANPA records, held by 4 carriers.
Is a call from a Preston prefix really from Preston?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.