Less than you would hope, and the two codes say the same thing as each other. 353 is an overlay, in service since September 2023 and covering exactly the same ground as 608, so neither one marks a half of the market or a side of the city. What the difference between them really records is roughly when a line was ordered, because the newer code goes to whoever asks next. Two firms on the same street can hold different codes and be equally local. Treat the digits as a formality, dial all ten of them, and put your real coverage in the greeting where a caller hears it before deciding to ring somebody else.