 About 12.8% of families and 14.7% of the population were below the poverty line, including 14.2% of those under age 18 and 16.4% of those age 65 or over.The area known as Sunnyside was founded in 1879, when George and James Whitmore arrived at the base of the Book Cliffs and established the Whitmore Cattle Ranch.In 1883, the Denver and Rio Grande Western Railroad (D&RGW) extended its line from the railhead at Deseret to Price.