What is an area code
The area code is usually the first three digits of a US number, also called NPA. It gives a rough location signal.
What is a prefix
NXX is the next three digits after the area code. Together, NPA-NXX provides more detailed assignment data.
Why state results are easier
Most users want CA, TX, DC, and other state or region labels instead of raw code tables.
How to export
Use state or region export for normal workflows; use city, carrier, or NPA-NXX fields only when permissions allow.
FAQ
Can area code alone identify the state?
Sometimes roughly, but detailed prefix matching is more reliable.
Is NPA-NXX exported to every user?
No. Detailed fields should follow subscription permissions.
Which filter is easier for normal users?
State or region filtering is easier to understand.