Area Code Lookup
What Area Code Is Kiefer?
Area code 539 · Oklahoma
Kiefer uses area code 539. It is located in Oklahoma.
Area Code Serving Kiefer
Frequently Asked Questions
What area code is Kiefer?
Kiefer uses area code 539. It is located in Oklahoma.
How do I call Kiefer from outside the US?
To call Kiefer from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-539-XXX-XXXX). The +1 is the country code for all NANPA countries.