Thanks. So are you saying that one can use colon even though I might not be listing items in a series ?
There are other uses for the colon, yes. But here you actually are listing items in a series; namely, the different parts of an address.
A colon can be used to connect two sentences together when the second sentence contrasts or explains the first.
Steve was wet through: it had been raining hard. (The second sentence explains why he was wet.)
Mary eats to live: Dave lives to eat. (The two sentences contrast each other.)
However, the colon is not often used these days.