Winnebago County is in Northern Illinois. Of the 102 counties in the Land of Lincoln, Winnebago County ranks 52nd in terms of size (519 square miles). Browse all Winnebago 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 Winnebago County is residential property.