According to the United States Census Bureau Jamul is located at .
According to the United States Census Bureau, the Jamul census-designated place (CDP) has a total area of 43.1 km² (16.6 mi²). 42.6 km² (16.5 mi²) of it is land and 0.5 km² (0.2 mi²) of it (1.08%) is water.
As of the census of 2000, there were 5,920 people, 1,762 households, and 1,541 families residing in the CDP. The population density was 138.9/km² (359.9/mi²). There were 1,789 housing units at an average density of 42.0/km² (108.8/mi²). The racial makeup of the CDP was 86.37% White, 2.13% African American, 0.39% Native American, 3.07% Asian, 0.24% Pacific Islander, 3.63% from other races, and 4.17% from two or more races. Hispanic or Latino of any race were 13.77% of the population.
There were 1,762 households out of which 44.3% had children under the age of 18 living with them, 77.7% were married couples living together, 6.0% had a female householder with no husband present, and 12.5% were non-families. 8.5% of all households were made up of individuals and 3.5% had someone living alone who was 65 years of age or older. The average household size was 3.30 and the average family size was 3.48.
In the CDP the population was spread out with 29.7% under the age of 18, 7.2% from 18 to 24, 25.7% from 25 to 44, 28.4% from 45 to 64, and 9.0% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 101.2 males. For every 100 females age 18 and over, there were 98.7 males.
The median income for a household in the CDP was $87,309, and the median income for a family was $89,550. Males had a median income of $60,808 versus $40,568 for females. The per capita income for the CDP was $32,450. About 5.0% of families and 8.9% of the population were below the poverty line, including 10.6% of those under age 18 and 7.5% of those age 65 or over.
In 1999, the Tipai Band of Kumeyaay Indians, with 64 members living on 6 acres (24,000 m2) of sovereign land in the Jamul area designated the "Jamul Indian Village," announced their intent to develop a new hotel and casino. The original plan, which required the US government to annex 81 acres (330,000 m2) of surrounding land to complete the project, met with strong opposition from local residents. After the annexation effort was denied, the casino plan was revised to fit the 6-acre (24,000 m2) reservation grounds. Despite continuing opposition from townspeople, a ceremonial groundbreaking took place on 10 December 2005.
The $200 million project is financed by Lakes Entertainment of Minnesota. The casino's original concept was to be developed according to the State of California's gambling compact. Proponents emphasize increased revenue for the state and the tribe, as well as 2000 new jobs for all members of the community, while opponents fear strain on its police and fire services, a major impact on the local water supply, and argue that a 15-story building will permanently change the town's character. The chief concern is the increased traffic on the main road through the town, Highway 94. The proposed casino location is such that all the traffic to and from would likely pass through the middle of the town.
On Feb 7, 2003, the U.S. Bureau of Indian Affairs held a meeting to discuss the environmental impact report produced by the Jamul Indian Tribe in support of the casino project. Hundreds of Jamul residents showed up to express almost unanimous opposition to the casino.
On Sept 13, 2006, casino organizers held a meeting with the townspeople on site to address their concerns. The casino plan was further clarified, with an artist's conception of the proposed six story casino and 12-story hotel complex on display. A court reporter was on hand to receive comments for or against the proposal, and of the 40 who did so, three were in favor. Most of the negative comments were in regard to increased traffic on Highway 94, which narrows to a two-lane road at the proposed site of casino.
On Mar. 10, 2007, the tribe evicted three residents (not tribal members) who had been living on the Indian Village land but who opposed the casino- Karen Toggery and her son and Walter Rosales. Local Jamulians gathered to protest the evictions. The Tribe hired a local security company and "deputized" them as "Jamul Tribal Police." These guards then utilized pepper spray and metal batons on some of the protestors who trespassed onto Tribal property and refused to leave. Tribal chairman Leon Acebedo signed an agreement witnessed by local Board of Supervisors member Dianne Jacob that stipulated that the homes of the evicted would not be destroyed for at least seven days. The homes were demolished two days later, leading to considerable controversy in the community. An unrelated statement was released that same day stating that the tribal leaders no longer wished to negotiate with the state regarding the casino and were planning a casino with Class II games only- which do not include slot machines- as casinos with only Class II games are not governed by compacts with the State of California.
On October 1, 2008 the tribe sued CalTrans after months of unsuccessful negotiations. The tribe claimed their sovereignty gives them the right to use the land that they see fit. CalTrans maintained that they represent the public’s safety and that they will not approve the permits to put a stoplight in the middle of 94 unless more environmental impact studies (EIR) are performed. The tribe continued to maintain that CalTrans’ preferred, safe alternative of building a driveway off a side road, Melody Lane, was “improper meddling by the state”. In the article cited above, a member of the tribe's Executive Council, Carlene Chamberlain, stated “The Minnesota company backing the casino, Lakes Entertainment, can't get funding for design and construction until it's clear that gamblers will be able to get to the slot machines.”. As the tribe appears unable or unwilling to meet CalTrans’ requirements, this lawsuit must be won by the tribe before the casino can be built.
During Lakes Entertainment's review of their 2008 results on March 12, 2009, they indicated that the Jamul Indian Tribe and CalTrans' had reached an understanding and that the Jamul Indian Tribe had agreed to create an EIR for the revised project. Lakes indicated also that the project would be re-evaluated in light of the financial environment and would be monitored closely. Although Lakes did say they wouldn't abandon the project completely, they reduced the "fair market value" of the project by 80%. In addition, Lakes revised their estimate of when the project could be completed to 2014.
In the state legislature Jamul is located in the 36th Senate District, represented by Republican Dennis Hollingsworth, and in the 77th and 78th Assembly District, represented by Republicans Joel Anderson and Shirley Horton respectively. Federally, Jamul is located in California's 52nd congressional district, which has a Cook PVI of R +9 and is represented by Republican Duncan D. Hunter.