Area Code 331: Comprehensive Guide to Technical and Geographic Details
Info: Area code 331 is an overlay serving the western suburbs of Chicago, Illinois, including parts of DuPage, Cook, Kane, and Will counties.
Technical Specifications of Area Code 331
- NPA Code: 331
- Type: Overlay
- Implementation Date: October 7, 2007
- State: Illinois
Geographic Coverage
Area code 331 covers the western suburbs of Chicago, Illinois, including parts of DuPage, Cook, Kane, and Will counties. The central geographic coordinates are approximately 41.833°N latitude and 88.100°W longitude.
Major Cities in Area Code 331
| City | Latitude | Longitude |
|---|---|---|
| Addison, IL | 41.9317 | -87.98896 |
| North Aurora, IL | 41.80614 | -88.3273 |
| Bartlett, IL | 41.99503 | -88.18563 |
| Batavia, IL | 41.85003 | -88.31257 |
| Bensenville, IL | 41.95503 | -87.94007 |
| Bloomingdale, IL | 41.95753 | -88.0809 |
| Bolingbrook, IL | 41.69864 | -88.0684 |
| Carol Stream, IL | 41.91253 | -88.13479 |
| Darien, IL | 41.75198 | -87.97395 |
| Downers Grove, IL | 41.80892 | -88.01117 |
| Elmhurst, IL | 41.89947 | -87.94034 |
| Glen Ellyn, IL | 41.87753 | -88.06701 |
| Glendale Heights, IL | 41.91031 | -88.07174 |
| Hanover Park, IL | 41.99947 | -88.14507 |
| Lisle, IL | 41.80114 | -88.07479 |
| Lombard, IL | 41.88003 | -88.00784 |
| Naperville, IL | 41.78586 | -88.14729 |
| Roselle, IL | 41.98475 | -88.07979 |
| Saint Charles, IL | 41.91419 | -88.30869 |
| Streamwood, IL | 42.02558 | -88.17841 |
| Villa Park, IL | 41.88975 | -87.98895 |
| West Chicago, IL | 41.88475 | -88.20396 |
| Westmont, IL | 41.79586 | -87.97562 |
| Wheaton, IL | 41.86614 | -88.10701 |
| Woodridge, IL | 41.74697 | -88.05034 |
Numbering and Utilization
- Total Numbers Available: Not specified
- Utilization Rate: Not specified
- Exhaust Projection: Not specified
Network Infrastructure
Major Carriers
- AT&T
- Verizon
- T-Mobile
- Sprint
Available Services
- Landline
- Wireless
- VoIP
Regulatory Framework
- Regulatory Body: Illinois Commerce Commission (ICC)
- Dialing Requirements: Ten-digit dialing is mandatory
- NANPA Regulations: Area code 331 is part of the North American Numbering Plan (NANP) and adheres to its regulations and guidelines.
Historical Milestones
- August 3, 1996: Area code 630 was created from a split of area code 708.
- October 7, 2007: Area code 331 was implemented as an overlay for area code 630.
Conclusion
Area code 331 is crucial for the telecommunications infrastructure in Chicago's western suburbs, addressing the demand for phone numbers due to population growth and increased mobile device usage. It is regulated by the Illinois Commerce Commission and complies with NANPA guidelines, ensuring efficient telecommunications services.
For more information about area codes and regulations, visit the North American Numbering Plan Administration (NANPA).