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. The Idalia Post Office has the ZIP code 80735.
Idalia is located at 39°42′15″N 102°17′35″W / 39.70417°N 102.29306°W / 39.70417; -102.29306 (39.704281,-102.293186), along U.S. Route 36 approximately two miles west of U.S. Route 385.
Idalia was founded in the late 19th century. The founders were primarily of German descent. While the population of the town is around 75, the surrounding community, almost purely of an agricultural base, is around 200.