Welcome to Waipio. Before you get your adventure underway, it’s helpful to know some basic facts about where you’re going. So straighten out your map, grab a highlighter and listen up.It sits 4,847 miles to the west of Washington, the buzzing national capital.Facts and figures your kind of thing? Like to know how many people live in this part of Waipahu before you set off on your day trip? At the last count, the population was 11,700.