I used to live in a rather odd little corner of London that had 3 roads in it. The one we lived on had only 5 houses on it, according to the actual addresses, but there were another three which had their doors on our road, but were technically on one of the side roads.
There was also no rhyme or reason to the numbering system. On our road there was X Cottage, Y Cottage, X House, Z House and Number 2 ABC Road. There was no 1 or 3 ABC Road, just a 2. There was also, it turned out, no number 2 DEF Road as number 2 was on ABC Road, even though it was called 2 ABC Road not 2 DEF Road.
[Head explodes]
Even better - 2 ABC Road was flats.
Postmen came and went with unsurprising regularity.