I created a custom search engine called LI-USA.info that searches US LinkedIn profiles (You’ll need to know the basic use of Boolean search terms like AND and OR).
Contact them through LinkedIn.
Call the people or hiring managers you identify.
Use Prophet or Connectifier to identify their email address or Social network profiles and contact them there.
However, if you have a pint or gallon sized LinkedIn network in the USA, this will give you a tool to look past it.