Of 102 counties in the Prairie State, McHenry County ranks 36th in terms of size (611 square miles). McHenry County is in Northern Illinois. The total value of nearly 1,000 acres of riverfront land and property recently listed for sale in McHenry County, Illinois, was almost $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.