Area Code 303

FTC complaints involving 303 numbers

Numbers shown with area code 303 in the FTC's Do Not Call “Reported Calls” database (recent reporting window). Most common reported reasons: “Other”, “Calls pretending to be government, businesses, or family and friends”, “Dropped call or no message”.

Most-complained 303 numbers:

• (303) 468-4065 — 25 complaints
• (303) 309-1163 — 20 complaints
• (303) 395-0849 — 17 complaints
• (303) 209-1177 — 10 complaints
• (303) 226-9260 — 10 complaints

These are FTC Do Not Call complaints filed about specific numbers shown with this area code — frequently spoofed. The area code itself is not a scam. See the most-reported area codes and the most-reported phone numbers nationwide.

Frequently asked questions

Where is area code 303?

Area code 303 covers Denver and nearby cities including Aurora, Lakewood, Thornton in Colorado, in the Mountain Time.

What cities use area code 303?

Area code 303 serves Denver, Aurora, Lakewood, Thornton, Arvada, and 19 other communities in Colorado.

What time zone is area code 303 in?

Area code 303 is in the Mountain Time (America/Denver).

How do you dial a 303 number?

Dial all 10 digits: 303 followed by the 7-digit local number. From abroad, dial +1 303 and the local number.

Is a call from area code 303 a scam?

A 303 number is geographically tied to Colorado, but caller ID can be spoofed, so the displayed area code does not prove where a caller really is. If you did not expect the call, do not share personal information and consider looking the number up.

Is 303 a country code?

No. 303 is a US area code (a domestic 3-digit code), not a country code. The country (calling) code for the United States is +1, shared across the North American Numbering Plan. So a full 303 number written for international dialing looks like +1 303 followed by the 7-digit local number.