Adjuntas, PR — rate center

NANPA rate center & CO code data, current as of July 28, 2026.

The Adjuntas rate center (Puerto Rico) anchors 3 active prefixes under area codes 787, 939. Rate centers, not city limits, are what phone numbers are legally tied to.

NANPA records show 3 active prefixes here across 3 carriers. 2 prefixes participate in thousands-block pooling, so blocks of 1,000 numbers are shared between carriers.

Routing-wise it sits in LATA 820.

Multiple area codes over one rate center (787/939) is the overlay pattern: same geography, different first three digits.

With only 3 prefixes, Adjuntas sits at the small end of Puerto Rico'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 Adjuntas 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 Adjuntas

FAQ

What area code is Adjuntas, PR?

Adjuntas is served by 2 area codes — 787, 939 — which overlay the same territory.

How many prefixes does Adjuntas have?

3 active NXX prefixes are anchored to this rate center in NANPA records, held by 3 carriers.

Is a call from a Adjuntas prefix really from Adjuntas?

Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.