Of five counties in the state, Honolulu County ranks third in terms of size (2,166 square miles). Honolulu County is in the Oahu Hawaii region. Browse all waterfront property for sale in Honolulu 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 Honolulu County is homesite.