Valeria is a city in Jasper County, Iowa, United States. The population was 39 at the time of the 2020 census. Valeria got its start in the year 188…Valeria is a city in Jasper County, Iowa, United States. The population was 39 at the time of the 2020 census. Valeria got its start in the year 1883, following construction of the Chicago Great Western Railway through the territory. Valeria's population was estimated at 100 residents in 1887, was 146 in 1902, and was 92 in 1915.