thumb|right|Eruption in the Leilani Estates subdivision (May 3, 2018)
thumb|right|Lava from a fissure slowly advanced to the northeast on Hoʻokupu Street in Leilani Estates subdivision (May 5, 2018)
Leilani Estates is a census-designated place (CDP) in Hawaiʻi County, Hawaii, United States located in the District of Puna. The subdivision was formed in 1964. The population was 1,139 at the 2020 census, and up from 1,046 at the 2000 census.
The 2018 lower Puna eruption of Kīlauea Volcano, which occurred within and around the subdivision, claimed many homes and displaced an unknown number of Leilani Estates residents. Accessing the entire resulting solid lava rock flow field has been prohibited, as per the Mayor's 12/6/18 Emergency Proclamation, with fines up to $5,000 for violations. As of January 2019, in further effort to prevent the private subdivision from becoming a public attraction, the Leilani Community Association began enforcing regulations regarding no parking on private roads, no trespassing on private property, and no tours being conducted in the subdivision.
Geography
Leilani Estates is located near the eastern tip of the island of Hawaiʻi. It is south of Pāhoa and south of Hilo. It is bordered to the southeast by the Malama Kī Forest Reserve.
According to the United States Census Bureau, the CDP has a total area of , all of it land. Zone 1 includes the summit and rift zones of active volcanoes—new eruptive vents can spawn anywhere inside this zone. Approximately 10% or out of the of Puna have been covered by lava flows since 1790.
2018 eruption
Of the 24 total volcanic fissure vents that formed during the event, 14 erupted lava to varying degrees within Leilani Estates. ʻAhuʻailāʻau (initially designated Fissure 8) on Luana St. was the dominant vent that produced the most output of lava, with fountaining as high as 330 feet and flow front advancement as fast as 76 m/h as it reached the ocean miles below Leilani Estates. By the time the eruption ceased on August 9 of 2018, around 200 homes had been destroyed within the subdivision.
Demographics
2020 census
As of the 2020 census, Leilani Estates had a population of 1,139. The median age was 55.0 years. 16.0% of residents were under the age of 18 and 31.5% of residents were 65 years of age or older. For every 100 females there were 114.9 males, and for every 100 females age 18 and over there were 116.0 males age 18 and over.
0.0% of residents lived in urban areas, while 100.0% lived in rural areas.
There were 514 households in Leilani Estates, of which 18.3% had children under the age of 18 living in them. Of all households, 35.0% were married-couple households, 30.7% were households with a male householder and no spouse or partner present, and 23.7% were households with a female householder and no spouse or partner present. About 33.2% of all households were made up of individuals and 18.1% had someone living alone who was 65 years of age or older.
There were 696 households, out of which 18.1% had children under the age of 18 living with them. The average household size was 2.24.