Area codes in Littleton, Colorado
Littleton, Colorado uses 3 area codes — 303, 720 and 983. The main Littleton area code is 303.
Area codes serving Littleton
Phone numbers in Littleton are written as ten digits — for example (303) 555-0190 — and fall in the Mountain Time zone.
How Littleton came to have 3 area codes
The original Littleton area code is 303, in service since 1947. As the area ran low on available numbers, overlay codes were added over the same region for new phone lines: 720 (1998) and 983 (2022). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Littleton now uses all 3 codes and every local call is dialed with ten digits.
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Frequently asked questions
What is the area code for Littleton?
The main area code for Littleton, Colorado is 303. Littleton is now served by 3 area codes in total: 303, 720, 983.
How many area codes does Littleton have?
Littleton has 3 area codes: 303, 720, 983.
Why does Littleton have more than one area code?
As Littleton used up the numbers available in its original area code (303, in service since 1947), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Littleton number?
Dial all 10 digits — the area code (303 or 720 or 983) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.