According to the United States Census Bureau, the CDP has a total area of 4.2 square miles (10.9 km²), of which, 4.2 square miles (10.8 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.71%) is water.
As of the census of 2000, there were 1,109 people, 544 households, and 283 families residing in the CDP. The population density was 265.8 people per square mile (102.7/km²). There were 613 housing units at an average density of 146.9/sq mi (56.8/km²). The racial makeup of the CDP was 94.14% White, 0.09% African American, 0.54% Native American, 0.27% Asian, 1.80% from other races, and 3.16% from two or more races. Hispanic or Latino of any race were 5.59% of the population.
There were 544 households out of which 22.2% had children under the age of 18 living with them, 38.6% were married couples living together, 10.3% had a female householder with no husband present, and 47.8% were non-families. 41.9% of all households were made up of individuals and 22.2% had someone living alone who was 65 years of age or older. The average household size was 2.04 and the average family size was 2.80.
In the CDP the population was spread out with 21.6% under the age of 18, 3.6% from 18 to 24, 22.8% from 25 to 44, 28.6% from 45 to 64, and 23.4% who were 65 years of age or older. The median age was 46 years. For every 100 females there were 90.2 males. For every 100 females age 18 and over, there were 83.3 males.
The median income for a household in the CDP was $24,271, and the median income for a family was $35,000. Males had a median income of $34,375 versus $31,406 for females. The per capita income for the CDP was $19,695. About 21.6% of families and 25.7% of the population were below the poverty line, including 42.5% of those under age 18 and 10.7% of those age 65 or over.
In the state legislature Springville is located in the 18th Senate District, represented by Republican Roy Ashburn, and in the 34th Assembly District, represented by Republican Connie Conway. Federally, Springville is located in California's 21st congressional district, which has a Cook PVI of R +13 and is represented by Republican Devin Nunes.
The rare wildflower Clarkia springvillensis was discovered near and named after Springville in 1964.
In the science fiction novel Lucifer's Hammer, written by Larry Niven and Jerry Pournelle, fragments of a comet strike the Earth, causing massive tidal waves to destroy most of the planet's coastal cities. Los Angeles is completely destroyed, and the collapse of dams throughout California causes the San Joaquin Valley to become an inland sea. The second half of this novel focuses on an enclave of civilization in the fictional "Silver Valley", located slightly east or northeast of Springville, and just north of the Middle Fork of the Tule River.
Several key scenes in Alfred Hitchcock's Saboteur (1942) take place at a ranch in Springville.