Of 102 counties in the Land of Lincoln, McHenry County ranks 36th by size (611 square miles). McHenry County is in Northern Illinois. There is almost 1,000 acres of ranches for sale in McHenry County, Illinois, based on recent Land Network data. The combined market value of land for sale here is nearly $3 million. Browse all McHenry County ranches for sale on the Land Network to find the ranch that's right for your business or commercial needs, from the sprawling legacy ranch to unbelievable residential ranch for your second home, investment property or retirement nest egg. The most common type of land for sale by combined acreage in McHenry County is undeveloped land.