Area codes in Westminster, Colorado
Westminster, Colorado uses 3 area codes — 303, 720 and 983. The main Westminster area code is 303.
Area codes serving Westminster
Phone numbers in Westminster are written as ten digits — for example (303) 555-0190 — and fall in the Mountain Time zone.
How Westminster came to have 3 area codes
The original Westminster 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 Westminster now uses all 3 codes and every local call is dialed with ten digits.
All Colorado area codes · Is a Westminster call a scam?
Nearby cities
- Denver area codes
- Lakewood area codes
- Aurora area codes
- Brighton area codes
- Boulder area codes
- Littleton area codes
- Longmont area codes
- Loveland area codes
More cities in Colorado
Frequently asked questions
What is the area code for Westminster?
The main area code for Westminster, Colorado is 303. Westminster is now served by 3 area codes in total: 303, 720, 983.
How many area codes does Westminster have?
Westminster has 3 area codes: 303, 720, 983.
Why does Westminster have more than one area code?
As Westminster 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 Westminster 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.