2489.

lucasitaly.com/2019/02/01/venetian-house-numbers

Finding an address in Venice has long had the reputation for being difficult. Shakespeare in The Merchant of Venice, puts the following speech into the mouth of someone being asked directions to the character Shylock’s house :

‘Turn up on your right hand at the next turning, but,
at the next turning of all, on your left; marry, at
the very next turning, turn of no hand, but turn
down indirectly’

For each sestiere, a starting point was chosen. The buildings were then numbered snaking out from that point. For example, in the Sestiere of San Marco, the Doge’s Palace was chosen as the starting point. This is how it came to be numbered San Marco 1.
Here we have sestriere Cannaregio 2489.