Area code 303: Denver, Colorado
Area code 303 is a Colorado code serving Denver, Boulder and Aurora, on Mountain Time. It overlays 720, 983, so numbers in the same area may start with any of them. From abroad, dial +1 303 and the 7-digit number.
Updated
At a glance
- State
- Colorado
- Places served
- Denver, Boulder, Aurora
- Time zone
- Mountain TimeUTC−7, UTC−6 in summer
- Overlay codes
- 720, 983Same area, assigned when numbers ran short.
- Country
- United States (+1)
- Number format
- (303) 555-0123+1 303 555 0123 in international format
How to call a 303 number
All +1 numbers are 10 digits: the 3-digit area code and a 7-digit local number.
| Calling from | Dial |
|---|---|
| Inside the US or Canada | 1 303 555 0123 |
| The UK and most of Europe | 00 1 303 555 0123 |
| Australia | 0011 1 303 555 0123 |
| Any mobile | +1 303 555 0123 |
555-0123 is a placeholder; use the real 7-digit number.
Get a (303) number without living there
A callmins US number costs $2.00/month, no setup fee. It rings in your browser or the callmins app anywhere in the world, receives texts, and needs no ID or local address. When you buy, search by area code to look for a 303 number.
Availability changes daily
Popular codes sell out. If there's no 303 number free, try the overlay codes 720, 983 or another Colorado code below. US numbers don't receive WhatsApp codes; use a UK number for that.
Other Colorado area codes
Questions people ask
Where is area code 303?
Area code 303 is in Colorado, the United States. It serves Denver, Boulder and Aurora, and shares the same area with 720, 983 (overlay codes).
What time zone is area code 303?
Area code 303 is on Mountain Time (UTC−7, UTC−6 in summer). Where an area straddles a time-zone line, this is the time most of its callers keep.
How do I call a 303 number from abroad?
Dial your exit code, then 1, then 303 and the 7-digit number: 00 1 303 from the UK and most of Europe, or +1 303 from any mobile. Inside the US and Canada, dial 1 303 and the number.
Is a call from area code 303 a scam?
303 is an ordinary geographic area code, not a premium-rate or toll-free one. But caller ID can be faked, so a familiar-looking local code proves nothing about who is calling. Don't share codes or payment details with an unexpected caller.
Can I get a 303 phone number?
You can search callmins for a 303 number when you buy a US number ($2.00/month, no setup fee). Which area codes have numbers free changes daily; if 303 has none, pick a nearby or overlay code such as 720.
Related
A 303 number, in your browser.
$2.00/month, no setup fee. Calls and texts on your laptop or phone, from anywhere.
Area code details are compiled from North American Numbering Plan assignments and list the best-known places served; check NANPA for the full boundary.