Idalia is a census-designated place and a U.S. Post Office in Yuma County, Colorado, United States. The population as of the 2010 Census was 88, while the population of the 80735 zip code is 405. The Idalia Post Office has the ZIP code 80735. The Idalia community, known locally as “Jewel of the Plains,” was founded in 1887. Located on the Eastern Plains of Colorado in southern Yuma County, approximately 150 miles east of Denver and 15 miles from the Kansas border, Idalia has been home for many generations of families. The primary industries of the area are farming, ranching, and natural gas production. The community has many amenities for a small rural community, including the Idalia Vision Foundation, Inc., two churches, local Co-Op, convenience store, restaurants, and a motel. A new Kindergarten through grade-12 school building opened in the fall of 2013 providing state-of-the-art educational programs & facilities.