Ephrata, WA (Washington) Houses and Residents. Total population: 8,031 (Urban population: 6,341 (all inside urban clusters), Rural population: 477 (all nonfarm)) Houses: 2,802 (2,578 occupied: 1,687 owner occupied, 1,104 renter occupied) Housing density: 281 houses/condos per square mile. Median price asked for vacant for-sale houses and condos in 2013 in this county: $200,853. Median contract rent in 2013: $398 (lower quartile is $276, upper quartile is $515) Median rent asked for vacant for-rent units in 2013: $512. Median gross rent in Ephrata, WA in 2013: $465. Housing units in Ephrata with a mortgage: 909 (147 second mortgage, 65 home equity loan, 0 both second mortgage and home equity loan) Houses without a mortgage: 553. Median household income for houses/condos with a mortgage: $61,959.