Meaning and local context
In Miami, “the 305” means Miami, identified through its best-known area code. Used in music, sports, branding, and local identity.
Example in context
A local example is “He represents the 305.” In plain English, that means “He represents Miami.”
He represents the 305.
He represents Miami.
How to interpret it
The surrounding sentence is important when interpreting “the 305”. Use the regional sense above when the situation matches the example instead of relying on the word or phrase in isolation.
Tone and caution
Miami-Dade also uses other area codes, so this is cultural shorthand. Because this is informal regional language, tone and situation should guide whether you use “the 305” yourself or simply recognise it when someone else uses it.