Hōnaunau-Nāpōʻopoʻo is located on the west side of the island of Hawaiʻi at 19°26′45″N 155°53′14″W / 19.445961°N 155.887090°W / 19.445961; -155.887090.

[2] It is bordered to the north by the Captain Cook CDP and to the west by the Pacific Ocean.

[5] Nāpōʻopoʻo has a tropical monsoon climate (Köppen Am) with uniformly warm temperatures year-round.

There were 944 housing units at an average density of 24.8 per square mile (9.6/km2).

20.3% of all households were made up of individuals, and 5.2% had someone living alone who was 65 years of age or older.