Area Code Lookup
What Area Code Is Colfax?
2 area codes serve Colfax
Colfax is served by area codes 309, 515. It spans Illinois and Iowa.
Area Codes Serving Colfax
Frequently Asked Questions
What area code is Colfax?
Colfax is served by area codes 309, 515.
Why does Colfax have multiple area codes?
As demand for phone numbers increased, NANPA added area codes through splits (dividing the region) or overlays (layering a new code over the same geography). Colfax now has 2 area codes — 309 and 515 — covering the same or overlapping areas.
How do I call Colfax from outside the US?
To call Colfax from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-309-XXX-XXXX). The +1 is the country code for all NANPA countries.