Kalawao County is a county in the U.S. state of Hawaii. It is the smallest county in the 50 states by land area and the second-smallest county by population, after Loving County, Texas. The county encompasses the Kalaupapa or Makanalua Peninsula, on the north coast of the island of Molokaʻi. The small peninsula is isolated from the rest of Molokaʻi by cliffs over a quarter-mile high; the only land access is a mule trail.

In the United States, a county or county equivalent is an administrative or political subdivision of a U.S. state or other territories of the United States which consists of a geographic area with specific boundaries and usually some level of governmental authority. The term "county" is used in 48 states, while Louisiana and Alaska have functionally equivalent subdivisions called parishes and boroughs, respectively. The specific governmental powers of counties vary widely between the states, with many providing some level of services to civil townships, municipalities, and unincorporated areas. Certain municipalities are in multiple counties; New York City is uniquely partitioned into five counties, referred to at the city government level as boroughs. Some municipalities have been consolidated with their county government to form consolidated city-counties, or have been legally separated from counties altogether to form independent cities. Conversely, those counties in Connecticut, Rhode Island, eight of Massachusetts's 14 counties, and Alaska's Unorganized Borough have no government power, existing only as geographic distinctions.