It looks like you have a lot of room in your Town Square area next to your cafe!
I visited a dream town with the station near the Train Station which I thought was really cool and I don't see that often. It looks like you have some room around there too~
Personally, I say put the police station right next to the cafe. That way, Booker or Copper can pop over for coffee whenever they need it, because they're open all day and night!
I would either put it next to the town hall, because that's a nice pair, or off to the right of the cafe like a lot of people have been saying. I tend to like my buildings closer together, but that's just me.