Area Code 303: Comprehensive Guide to Colorado's North-Central Region
Info: Area code 303 is integral to the North American Numbering Plan (NANP), covering Colorado's north-central area, including Denver and Boulder. It operates alongside area codes 720 and 983.
Technical Specifications
- NPA Code: 303
- Type: Overlay
- Implementation Date: 1947
- State: Colorado
Geographic Coverage
Area code 303 serves the north-central region of Colorado, including major urban centers such as Denver and Boulder.
Major Cities
| City | Latitude | Longitude |
|---|---|---|
| Arvada | 39.80276 | -105.08748 |
| Aurora | 39.72943 | -104.83192 |
| Boulder | 40.01499 | -105.27055 |
| Brighton | 39.98526 | -104.82053 |
| Broomfield | 39.92054 | -105.08665 |
| Castle Rock | 39.37221 | -104.85609 |
| Denver | 39.73915 | -104.9847 |
| Lakewood | 39.70471 | -105.08137 |
| Longmont | 40.16721 | -105.10193 |
| Thornton | 39.86804 | -104.97192 |
Numbering Statistics
- Total Numbers Available: 23.8 million
- Utilization Rate: Data not provided
- Exhaust Projection: 2023
Network Infrastructure
Major Carriers
- AT&T
- Verizon
- T-Mobile
Services Offered
- Landline
- Wireless
- VoIP
Regulatory Framework
- Regulatory Body: Colorado Public Utilities Commission
- Dialing Requirements: Ten-digit dialing is mandatory for all calls within the area.
- NANPA Regulations: Area code 303 is part of an overlay complex with area codes 720 and 983.
Historical Milestones
- 1947: Area code 303 was established as one of the original North American area codes.
- 1988: Area code 719 was split from 303.
- 1995: Area code 970 was created from 303.
- 1998: Area code 720 was added as an overlay.
- 2022: Area code 983 was introduced as an additional overlay.
Conclusion
Area code 303 is vital to Colorado's telecommunications, supporting a populous and expanding region. The overlay with area codes 720 and 983 ensures ample numbering resources. For further details, visit the Colorado Public Utilities Commission or the Wikipedia page on Area Code 303.