The 305 area code is rich in history and significance, particularly in Florida.

Geographical Coverage: Area code 305 covers southeastern Florida, including all of Miami, Miami-Dade County, and parts of the Florida Keys in Monroe County. Its coverage extends to several key cities such as Hialeah, Miami Beach, Kendall, Homestead, Key West, and Marathon​​.

History and Expansion: Established in 1940, area code 305 was one of the first area codes created and originally served the entire state of Florida. Due to the high demand in this region, area code 305 now has an overlay, area code 786. In 1953, the state of Florida was split into two area codes, with 305 covering the southern portion of the state​​​​.

Population Coverage: Currently, area code 305 and its overlays (645 and 786) collectively serve a population of approximately 4.729 million people. This expansive coverage reflects the area's significant growth and demand for telephone services​​.

These facts highlight the 305 area code's pivotal role in Florida's telecommunications history and its ongoing importance in serving a large and diverse population.