Of 102 counties in the Inland Empire, McHenry County is 36th in terms of its size (611 square miles). McHenry County is in Northern Illinois. The total value of almost 1,000 acres of riverfront land recently listed for sale in McHenry County, Illinois, was roughly $300,000. Browse all waterfront property for sale in McHenry County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in McHenry County is undeveloped land.