Hillsdale, TN — rate center

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

The Hillsdale rate center (Tennessee) anchors 2 active prefixes under area codes 615, 629. Rate centers, not city limits, are what phone numbers are legally tied to.

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

The rate center belongs to the Nashville-Davidson--Murfreesboro--Franklin, TN Metropolitan Statistical Area. Routing-wise it sits in LATA 470.

Multiple area codes over one rate center (615/629) is the overlay pattern: same geography, different first three digits.

With only 2 prefixes, Hillsdale sits at the small end of Tennessee'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 Hillsdale 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 Hillsdale

FAQ

What area code is Hillsdale, TN?

Hillsdale is served by 2 area codes — 615, 629 — which overlay the same territory.

How many prefixes does Hillsdale have?

2 active NXX prefixes are anchored to this rate center in NANPA records, held by 2 carriers.

Is a call from a Hillsdale prefix really from Hillsdale?

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