Hydro was home to Lucille Hammons, a Route 66 icon dubbed "The Mother of the Mother Road." Her motel and gas station still stand on Old Route 66 just west of Hydro. A modern replica of the station, with a large restaurant attached, is in nearby Weatherford.
In downtown Hydro, an old-fashioned drug store still serves up sodas and lunch.
There were 413 households out of which 31.5% had children under the age of 18 living with them, 51.8% were married couples living together, 10.7% had a female householder with no husband present, and 32.2% were non-families. 29.1% of all households were made up of individuals and 11.6% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 2.98.
In the town the population was spread out with 24.1% under the age of 18, 9.7% from 18 to 24, 23.9% from 25 to 44, 20.8% from 45 to 64, and 21.5% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 84.7 males. For every 100 females age 18 and over, there were 83.4 males.
The median income for a household in the town was $27,235, and the median income for a family was $31,071. Males had a median income of $26,645 versus $17,308 for females. The per capita income for the town was $13,256. About 14.4% of families and 18.0% of the population were below the poverty line, including 23.6% of those under age 18 and 10.1% of those age 65 or over.