could have something to do with emergency services and being registered on a citywide plan sort of thing. parents have a cottage on the beach - second one in from the dirt road and their number is 67
I think Hana has it right. My parents' house was No 11 but was changed to No 2917 due to 911 listings. I don't think there is any logical organisation in it though such as by block, etc though the houses do follow each other numerically. Not sure how the first house number is chosen though.
Zip codes, the equivalent to postcodes, are the same kind of thing. They don't progress numerically across the country or have any kind of logic as far as I can tell. Unless you happen to know a certain zip code for an area they don't make any sense. I was amazed when I came to the UK and could tell where someone lived just by their postcode!
When the original continental surveys were done, they put a grid over the whole country, and so everywhere has a grid reference. Not every house numbering system follows this, but those that do often have numbers in the 1000s.
Where we lived, every block is 100 numbers, so they evenly spread the propert numbers, and if they build something in between, it can have a number too. Ten blocks took up about a mile, so the 10000 block would be approximately 10 miles from Downtown, or east-west of the road that was deemed to go right through the middle.