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Area Code 309: Comprehensive Guide to Technical and Geographic Insights

Area code 309 is integral to west-central Illinois, encompassing cities like Bloomington, Peoria, and Moline. Established in 1957, it is part of the North American Numbering Plan (NANP).

Technical Specifications of Area Code 309

  • NPA Code: 309
  • Type: Overlay (with area code 861)
  • Implementation Date: 1957
  • State: Illinois

Geographic Coverage

Area code 309 covers the west-central region of Illinois. For instance, Peoria, a pivotal city in this area, is located at approximately 40.69365°N latitude and -89.58899°W longitude.

Major Cities Served

  • Bloomington: 40.4842°N, -88.99369°W
  • East Moline: 41.50087°N, -90.4443°W
  • East Peoria: 40.66615°N, -89.5801°W
  • Galesburg: 40.94782°N, -90.37124°W
  • Moline: 41.5067°N, -90.51513°W
  • Normal: 40.5142°N, -88.99063°W
  • Pekin: 40.56754°N, -89.64066°W
  • Peoria: 40.69365°N, -89.58899°W
  • Rock Island: 41.50948°N, -90.57875°W

Numbering and Utilization Statistics

  • Total Numbers Available: Not specified
  • Utilization Rate: Not specified
  • Exhaust Projection: Late 2023 (according to NANPA projections)

Network Infrastructure and Services

Major Carriers and Services

  • Services Offered:
    • Landline
    • Wireless
    • VoIP

Regulatory Framework and Guidelines

  • Regulatory Body: Illinois Commerce Commission (ICC)
  • Dialing Requirements: Transitioned to ten-digit dialing on October 24, 2021
  • NANPA Regulations: Includes allocation of central office codes and overlay implementation of area code 861

Historical Milestones

  • 1947: Illinois divided into four numbering plan areas; 815 covered the northern region.
  • 1957: Area code 309 was created from a split of area code 815.
  • 2021: Transition to ten-digit dialing due to the designation of 988 as the National Suicide Prevention Lifeline.
  • 2023: Introduction of overlay area code 861 to prevent number exhaustion.

Conclusion

Area code 309 remains a vital component of the telecommunications infrastructure in west-central Illinois, supporting major cities and numerous smaller communities. The addition of overlay area code 861 ensures ongoing availability of numbers in the region.

For more detailed information, visit the Illinois Commerce Commission's official site or the Wikipedia page on Area Code 309.