Question 1

What is the area code for DeKalb?

Accepted Answer

The main area code for DeKalb, Illinois is 815. DeKalb is now served by 2 area codes in total: 815, 779.

Question 2

How many area codes does DeKalb have?

Accepted Answer

DeKalb has 2 area codes: 815, 779.

Question 3

Why does DeKalb have more than one area code?

Accepted Answer

As DeKalb used up the numbers available in its original area code (815, in service since 1947), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.

Question 4

How do you dial a DeKalb number?

Accepted Answer

Dial all 10 digits — the area code (815 or 779) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.

Area codes in DeKalb, Illinois

Area codes serving DeKalb

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