Use PokemonGo For Business
You can either fill out a general “No PokeStops or Gyms near me” ticket, or ask about how to create a specific location. The form only allows for business submissions at the moment, but you could always try something less commercial and hope Niantic gets the hint. Make sure you read up on why certain sites are already PokeStops and Gyms before you go on a submission frenzy.