|Total||14.6 sq mi (37.7 km2)|
|Land||11.5 sq mi (29.8 km2)|
|Water||3.0 sq mi (7.9 km2)|
|Elevation||354 ft (108 m)|
|Density||501.2/sq mi (193.5/km2)|
|Time zone||Pacific (PST) (UTC-8)|
|Summer (DST)||PDT (UTC-7)|
|GNIS feature ID||1504879|
A quiet town founded on March 18, 1902 by George Finley, a farmer who relocated to the area from Nebraska. In 1908, it was only a small community of 25 families. During the 1950s, there was a major population increase when the neighboring town of Hover was relocated to Finley, due to the construction of the dam which allowed the local school to be River View High School. Fresh water sources and access to established rail lines and power grids in 1950s and 1960s have prompted some manufacturing and chemical plants who have remained in town ever since.
Finley is located at (46.175660, -119.057361).
According to the United States Census Bureau, the CDP has a total area of 14.6 square miles (37.7 km ), of which, 11.5 square miles (29.8 km ) of it is land and 3.0 square miles (7.9 km ) of it (20.88%) is water.
As of the census of 2000, there were 5,770 people, 1,987 households, and 1,585 families residing in the CDP. The population density was 501.2 people per square mile (193.6/km ). There were 2,082 housing units at an average density of 180.8/sq mi (69.8/km ). The racial makeup of the CDP was 91.40% White, 0.03% African American, 1.11% Native American, 0.24% Asian, 0.12% Pacific Islander, 4.71% from other races, and 2.37% from two or more races. Hispanic or Latino of any race were 8.99% of the population.
There were 1,987 households out of which 39.1% had children under the age of 18 living with them, 62.7% were married couples living together, 10.5% had a female householder with no husband present, and 20.2% were non-families. 14.9% of all households were made up of individuals and 4.3% had someone living alone who was 65 years of age or older. The average household size was 2.90 and the average family size was 3.19.
In the CDP the age distribution of the population shows 29.5% under the age of 18, 8.4% from 18 to 24, 28.5% from 25 to 44, 24.8% from 45 to 64, and 8.8% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 101.7 males. For every 100 females age 18 and over, there were 101.8 males.
The median income for a household in the CDP was $42,820, and the median income for a family was $47,983. Males had a median income of $41,103 versus $23,818 for females. The per capita income for the CDP was $17,282. About 6.2% of families and 6.5% of the population were below the poverty line, including 9.1% of those under age 18 and 8.4% of those age 65 or over.