2020 census As of the
2020 census, Thermal had a population of 2,676. The population density was . The median age was 29.6 years. The age distribution was 32.5% under the age of 18, 10.2% aged 18 to 24, 27.1% aged 25 to 44, 21.1% aged 45 to 64, and 9.0% who were 65 years of age or older. For every 100 females, there were 108.6 males, and for every 100 females age 18 and over there were 106.5 males age 18 and over. The census reported that 99.6% of the population lived in households, 0.4% lived in non-institutionalized group quarters, and no one was institutionalized. There were 664 households, out of which 56.0% included children under the age of 18, 54.8% were married-couple households, 7.2% were
cohabiting couple households, 21.8% had a female householder with no spouse or partner present, and 16.1% had a male householder with no spouse or partner present. 13.6% of households were one person, and 6.0% were one person aged 65 or older. The average household size was 4.01. There were 554
families (83.4% of all households). There were 719 housing units at an average density of , of which 664 (92.4%) were occupied. Of these, 48.8% were owner-occupied, and 51.2% were occupied by renters. 7.6% of housing units were vacant. The homeowner vacancy rate was 1.5% and the rental vacancy rate was 3.7%.
2010 census Thermal first appeared as a
census-designated place in the
2010 U.S. census. ==Education==