[3] The name comes from the myth that the gods Kāne and Kanaloa threw a stone to determine the boundaries, but it was lost and later found at Pili o Kahe.

[4] Hawaiian settlement on the ʻEwa Plain dates back at least to the 12th century C.E., at which time kanaka maoli expanded the main channel of Puʻuloa (Pearl Harbor) before creating fishponds and terraced agricultural fields in the surrounding area.

Scholars have recognized ʻEwa's ancient fishponds as exemplary evidence of Native Hawaiian ingenuity.

With 11,000 acres (4,500 ha) of land sublet by Benjamin Dillingham, W.R. Lowrie became the first plantation manager in 1891, when Hawaiʻi was under the rule of Queen Liliʻuokalani.

Throughout the twentieth century, it played a very influential role in Hawaii's culture, economy, and politics.

76) which runs north (away from the coast) past ʻEwa to Waipahu, connecting there to Farrington Highway (State Rte.

[21] In 2005, the team from ʻEwa Beach, representing (locally) West Oʻahu and the United States, captured the Little League World Series crown, beating Curaçao 7–6 in an extra inning after a walk-off home run by Michael Memea.