Firth is a city in Bingham County, Idaho, United States. The population was 477 at the 2010 census. Geography Firth is located at (43.305519, -112.183938). According to the United States Census Bureau, the city has a total area of , all of it land. Firth is located on the eastern side of the Snake River, facing the Blackfoot Mountains. History Firth began as a Swedish settlement in 1885. It was named for Lorenzo J. Firth, an English emigrant, who gave land for the railroad section house and water tank; the railroad named the station for him in 1903. The post office was established in 1905. Demographics 2010 census At the 2010 census there were 477 people in 168 households, including 121 families, in the city. The population density was . There were 173 housing units at an average density of . The racial makup of the city was 79.5% White, 2.1% Native American, 0.4% Pacific Islander, 14.5% from other races, and 3.6% from two or more races. Hispanic or Latino of any race were 25.2%. Of the 168 households 42.3% had children under the age of 18 living with them, 57.1% were married couples living together, 10.7% had a female householder with no husband present, 4.2% had a male householder with no wife present, and 28.0% were non-families. 26.2% of households were one person and 14.3% were one person aged 65 or older. The average household size was 2.84 and the average family size was 3.45. The median age was 31.4 years. 31.4% of residents were under the age of 18; 8.4% were between the ages of 18 and 24; 24.7% were from 25 to 44; 23.1% were from 45 to 64; and 12.2% were 65 or older. The gender makeup of the city was 50.5% male and 49.5% female. 2000 census At the 2000 census there were 408 people in 142 households, including 100 families, in the city. The population density was . There were 148 housing units at an average density of . The racial makup of the city was 70.34% White, 0.25% African American, 0.49% Native American, 20.83% from other races, and 8.09% from two or more races. Hispanic or Latino of any race were 29.17%. Of the 142 households 42.3% had children under the age of 18 living with them, 59.9% were married couples living together, 8.5% had a female householder with no husband present, and