Lookup › Area code 421
421 Area Code
Most looked-up 421 numbers
Phone prefixes in 421
Frequently asked questions
What prefixes are in area code 421?
Phone2.io tracks 1 phone prefixes in area code 421, with carrier and spam-report data on individual numbers.
More about area code 421
Area code 421 overview, history, and local numbers
Last updated: June 15, 2026