Who's jurisdiction is this? Littleton or Centennial? And do I call the police or the city?

There is no sidewalk on the other side of Broadway, and the sidewalk here has cars parked on it. Pedestrians have no safe options.

Why is there no response to this? After 121 days?

no comment? This is a little frustrating. Still a problem. it's the sort of thing that contributes to a lower quality of life for those who want to walk or bike rather than drive.

Thats probably Centennial. Call their Code Enforcement and file a complaint.