State
Area Code 303
Denver, Longmont, Fort Lupton, Colorado
Local time now
…
Time zone
Mountain
Main cities
Denver, Longmont, Fort Lupton, Keenesburg, Hudson, Georgetown
In service since
1947
When you can make sales calls to 303 numbers
| Every day | 8 AM – 9 PM (federal rule) |
In the called person's local time. Guidance, not legal advice.
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Other area codes in Colorado
Questions about area code 303
- Where is area code 303?
- Area code 303 is in Colorado, covering Denver, Longmont, Fort Lupton, Keenesburg.
- What time zone is area code 303?
- Mountain time.
- When can telemarketers call a 303 number?
- Federal rules allow sales calls from 8 AM to 9 PM local time.
- Is 303 a toll-free number?
- No. 303 is a regular area code for Colorado. Toll-free codes are 800, 833, 844, 855, 866, 877 and 888.