Longmont, CO — rate center
The Longmont rate center (Colorado) anchors 63 active prefixes under area codes 303, 720, 983. Rate centers, not city limits, are what phone numbers are legally tied to.
NANPA records show 63 active prefixes here across 14 carriers. 51 prefixes participate in thousands-block pooling, so blocks of 1,000 numbers are shared between carriers.
Routing-wise it sits in LATA 656.
Multiple area codes over one rate center (303/720/983) is the overlay pattern: same geography, different first three digits.
As always with US numbering: a prefix anchored to Longmont 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 Longmont
| Prefix | Code holder | Pooled |
|---|---|---|
| 303-485 | QWEST CORPORATION | No |
| 303-532 | PAETEC ITEL, LLC | Yes |
| 303-651 | QWEST CORPORATION | No |
| 303-652 | QWEST CORPORATION | Yes |
| 303-678 | QWEST CORPORATION | No |
| 303-682 | QWEST CORPORATION | No |
| 303-684 | QWEST CORPORATION | No |
| 303-702 | QWEST CORPORATION | No |
| 303-709 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | Yes |
| 303-746 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | Yes |
| 303-772 | QWEST CORPORATION | No |
| 303-774 | QWEST CORPORATION | No |
| 303-775 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | No |
| 303-776 | QWEST CORPORATION | No |
| 303-827 | LEVEL 3 COMMUNICATIONS, LLC - CO | Yes |
| 303-834 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | Yes |
| 303-845 | TELEPORT COMMUNICATIONS AMERICA, LLC - CO | Yes |
| 303-848 | LEVEL 3 COMMUNICATIONS, LLC - CO | Yes |
FAQ
What area code is Longmont, CO?
Longmont is served by 3 area codes — 303, 720, 983 — which overlay the same territory.
How many prefixes does Longmont have?
63 active NXX prefixes are anchored to this rate center in NANPA records, held by 14 carriers.
Is a call from a Longmont prefix really from Longmont?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.