Hamilton City (formerly, Hamilton) is a census-designated place (CDP) in Glenn County, California, United States. The population was 1,903 at the 2000 census. Hamilton City is located 9.5 miles (15 km) east of Orland, at an elevation of 151 feet (46 m). The default numbers used for wired telephones in Hamilton City are (530) 826-xxxx. The postal ZIP Code is 95951.
The community is located along the Sacramento River near Mile 199. Gianella Bridge gets traffic on SR32 across the river. A local landmark, known to all locals, is Hamilton Union High School. Landmark grain elevators, originally Holly Sugar Corporation, and served by California Northern Railroad are visible from all over town. Glenn-Colusa Canal marks the west extent of the town.
According to the United States Census Bureau, the CDP has a total area of 0.3 square miles (0.8 km²), all of it land.
The town began in 1905 with the founding of a large sugar beet processing plant. The first post office at Hamilton City opened in 1906. The name honors J.G. Hamilton, sugar company president.
As of the census of 2000, there were 1,903 people, 513 households, and 431 families residing in the CDP. The population density was 6,043.9 people per square mile (2,370.2/km²). There were 543 housing units at an average density of 1,724.6/sq mi (676.3/km²). The racial makeup of the CDP was 38.10% White, 0.37% Black or African American, 1.21% Native American, 0.32% Asian, 56.38% from other races, and 3.63% from two or more races. 80.56% of the population were Hispanic or Latino of any race.
There were 513 households out of which 52.0% had children under the age of 18 living with them, 64.9% were married couples living together, 11.7% had a female householder with no husband present, and 15.8% were non-families. 10.5% of all households were made up of individuals and 4.7% had someone living alone who was 65 years of age or older. The average household size was 3.71 and the average family size was 4.00.
In the CDP the population was spread out with 33.4% under the age of 18, 12.6% from 18 to 24, 28.3% from 25 to 44, 18.5% from 45 to 64, and 7.2% who were 65 years of age or older. The median age was 28 years. For every 100 females there were 106.0 males. For every 100 females age 18 and over, there were 113.1 males.
The median income for a household in the CDP was $33,169, and the median income for a family was $34,167. Males had a median income of $20,405 versus $14,191 for females. The per capita income for the CDP was $9,047. About 17.5% of families and 20.6% of the population were below the poverty line, including 29.0% of those under age 18 and 9.2% of those age 65 or over.
In the state legislature Hamilton is located in the 4th Senate District, represented by Republican Sam Aanestad, and in the 2nd Assembly District, represented by Republican Doug LaMalfa. Federally, Hamilton is located in California's 2nd congressional district, which has a Cook PVI of R +13 and is represented by Republican Wally Herger.