no sidewalks here period. we have "share the road" ... tho the cars get really pissy and start honking when you dare to ride close to the edge of the road.
We have sidewalks here and there in town. Mostly newer or nicer subdivisions. The sidewalk I run on near my parents' house will have bikes occasionally (my parents' bike up to the grocery store on the sidewalk).
I was running once with headphones on and all of a sudden a bike passes me on the left (I try to run as close to the right side as comfortable). I was startled but realized I probably didn't hear a warning cause I was listening to my music.