What is 309 Area Code?

The 309 area code is a telephone area code in Illinois, serving the central and western regions of the state. It covers major cities like Peoria, Bloomington, Moline, and Galesburg, along with numerous smaller communities. Introduced in 1957, it provides residents and businesses with a strong regional identity and remains an essential part of Illinois’ communication network.

  • State: Illinois
  • Major Cities: Peoria, Bloomington, Moline, Galesburg, Quincy, East Peoria, Macomb
  • Time Zone: Central Time Zone (CT)
  • Established: 1957
  • Overlay Area Code: None 
  • Region Population: Approximately 1.03 million people
  • Primary Uses: Landlines, mobile phones, business lines, and VoIP services

Population & Demographics of 309 Area Code

The 309 area code serves a population of about 1.03 million people across central and western Illinois. This region includes a mix of urban centers like Peoria and Bloomington, along with smaller rural communities, creating a diverse customer base for businesses.

The demographics reflect a balanced economy with strong representation in manufacturing, healthcare, education, and agriculture. With both young professionals and established families, the area offers businesses a wide range of opportunities to connect with local residents.

309 Area Code Time Zone

The 309 area code operates in the Central Time Zone (CT). This ensures synchronized communication with many parts of the Midwest, making it convenient for both regional and national businesses.