Search for Algonquin luxury homes with the Sotheby’s International Realty network, your premier resource for Algonquin homes. We have 108 luxury homes for sale in Algonquin, and 36,227 homes in all of Illinois. Homes listings include vacation homes, apartments, penthouses, luxury retreats, lake homes, ski chalets, villas, and many more lifestyle options. Each sale listing includes detailed descriptions, photos, amenities and neighborhood information for Algonquin.