The population was 8,126 at a 2007 estimate.
According to the United States Census Bureau, the city has a total area of 1.9 square miles (4.9 km²), all of it land. Live Oak is an agricultural community located in the fertile Sacramento Valley. Rich farmlands, orchards, the Feather River, and the Sutter Buttes surround Live Oak.
Live Oak's climate usually consists of hot, dry summers and prolonging wet, cool winters, a Mediterranean climate. Summers are hot, sunny and dry but a delta breeze occurs at times. This cools the temperature but doesn't last long. Heat waves occur during the summer months, lasting for 3–5 days on average. Temperatures range from 105 to 110 degrees. Dry months range from mid to late May to early to mid September where rainfall is rare. The hottest month is July with temperatures averaging around 96 to 100 degrees with no rain but it isnt rare for some rain to arrive from the Southwest Monsoon. Winters are prolonging wet, cool and foggy. Wet months range from mid October to mid April where rainfall becomes constant. January is the wettest and coolest month with rainfall averaging between 4 to 6 inches but during El Niño season, rainfall averages 10 to 12 inches which causes major flooding. During the La Niña season, rainfall averages 4 inches or below, causing drought problems during summer. In the winter, temperatures average 45 to 50 degrees. Foggy and cloudy weather can last up to 2 to 4 weeks, also known as Tule fog. Snow occurs rarely. The record amount of snow was 3.8 inches in 2002.
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As of the census of 2000, there were 6,229 people, 1,729 households, and 1,393 families residing in the city. The population density was 3,277.8 people per square mile (1,265.8/km²). There were 1,818 housing units at an average density of 956.7/sq mi (369.4/km²). The racial makeup of the city was 49.67% White, 1.57% African American, 1.89% Native American, 9.63% Asian, 0.06% Pacific Islander, 32.62% from other races, and 4.54% from two or more races. Hispanic or Latino of any race were 48.61% of the population.
There were 1,729 households out of which 48.8% had children under the age of 18 living with them, 60.7% were married couples living together, 14.3% had a female householder with no husband present, and 19.4% were non-families. 17.0% of all households were made up of individuals and 8.8% had someone living alone who was 65 years of age or older. The average household size was 3.43 and the average family size was 3.85.
In the city the population was spread out with 33.0% under the age of 18, 9.6% from 18 to 24, 29.5% from 25 to 44, 17.2% from 45 to 64, and 10.7% who were 65 years of age or older. The median age was 30 years. For every 100 females there were 91.4 males. For every 100 females age 18 and over, there were 85.5 males.
The median income for a household in the city was $25,754, and the median income for a family was $31,075. Males had a median income of $22,901 versus $20,852 for females. The per capita income for the city was $9,571. About 26.0% of families and 30.2% of the population were below the poverty line, including 40.4% of those under age 18 and 7.9% of those age 65 or over.
In the state legislature Live Oak is located in the 4th Senate District, represented by Republican Sam Aanestad, and in the 2nd Assembly District, represented by Republican Doug LaMalfa. Federally, Live Oak is located in California's 2nd congressional district, which has a Cook PVI of R +13 and is represented by Republican Wally Herger.
Live Oak has a mainly volunteer fire department, which is part of the Sutter County Fire Department. EMS (i.e. ambulances) are covered by the Bi-County Ambulance company, which covers both Sutter and Yuba County areas.
Until the mid 1970's, Live Oak had its own police department. In the 70's the city decided to contract out services from the Sutter County Sheriff's Department. There is a dedicated group of deputies from the Sheriff's Department who are stationed in and patrol mainly in the Live Oak contract area, making for a more effective patrol and more community oriented department. The city has a substation staffed with seven patrol deputies, a Sergeant and a Lieutenant. The city also has a K9 unit to exclusively patrol the Live Oak area.
Both the Sheriff's Department Live Oak Sub Station and the Live Oak Fire Department are located at the corner of Fir Street and O Street in Live Oak.
The City's economy relies mainly on agricultural production, but there are other members of the commercial community;