I also have no deer around my house. I do have pigeons, squirells, cats, moles, rabbits, and lots of birds.
I used to have a ton of Ivy all around my house which I ripped out. I have since learned that dark, damp places like that are tick heaven.
I also found out that ticks can live on just about animal that has skin and blood.
I was mowing my lawn last year and a tick fell out of a tree and landed on my shoulder - no lie! I freaked.
I have since gotten my trees removed.
Anyway - my point is that you can get bitten by a deer tick anywhere. Not just in the woods.