Aguanga (/əˈwɑːŋ.ɡə/; Luiseño: Awáanga, meaning "dog place") is a census-designated place located within the Inland Empire in Riverside County, California. It is located about 18 miles (29 km) east of Temecula and 22 miles (35 km) south-southeast of Hemet. Aguanga lies at an elevation of 1955 feet (596 m). As of the 2010 census, it had a population of 1,028.

The town gets its name from a former village of the Native village called awáanga, meaning 'dog place'. Butterfield Overland Mail established a station 1.7 miles to the west of the current post office in 1858. It was at first called Tejungo Station and was located 14 miles east of Temecula Station and 12 miles northwest of Oak Grove Stage Station. The wooden building was located in a grove of trees a few hundred feet from the stage road. Soon, however, it became known as Aguanga Station after the name of the nearby Luiseño village.

The November 7, 1861, report of Lieut. Col. Joseph R. West, mentioned the abandoned station location was then called Giftaler’s Ranch, after its German owner Joseph Giftaler, in a journal of his unit's march to Fort Yuma on the old Butterfield Overland Mail route. In a later Civil War itinerary of the route, it is referred to as the "Dutchman's". In 1863, Camp Giftaler Ranch was established at the ranch as a post along the march route of troops to the Arizona Territory by the Union army.

In 1864, Giftaler's Ranch was purchased by Jacob Bergman, also a German immigrant, stagecoach driver and Union army veteran, who operated the Bergman Ranch there for many years until his death on September 13, 1894. After the Civil War, he ran Bergman's Stage Station there for the Banning and Tomlinson Stage lines for many years. During the Julian gold rush, he ran the Guahonga post office there from July 27, 1870, to September 13, 1871. The post office for the area was then moved to Oak Grove until the Bergman post office was opened in 1894, but its name was changed to Aguanga in 1901.

Today the station site is on the Twin Creek Stage Stop Ranch, on Allmouth Road, found just east of the Stagecoach Inn at 43851 Highway 79. The ruins of the old wooden station building and ranch house is located among a grove of trees, at the foot of the west end of the hill at the bottom of the meadow, along the right fork of Allmouth Road. The small, fenced-in Bergman Family Cemetery and the Jacob Bergman Marker are found on Caprice Road, 200 feet from the highway, just across the highway from the entrance to the ranch and a short distance to the east.

On September 7, 2020, deputies with the Riverside County Sheriff's Department responded to reports of an assault with a deadly weapon at a residence along Route 371. Upon responding, they found a woman suffering gunshot wounds, who eventually died from her injuries after being rushed to a hospital. The deputies then discovered six additional victims inside the home, all of whom were dead from gunshots. Authorities believed the shooting was an isolated incident. The residence where the shooting occurred was reportedly being used to grow illegal marijuana. Authorities did not find a motive or any viable suspects. The shooting is the deadliest in Riverside County's history.

On July 29, 2024, the Nixon Fire ignited near Tule Valley Road and Richard Nixon Boulevard.

According to the United States Census Bureau, the CDP covers an area of 13.6 square miles (35.2 km), all of it land.

The community of Aguanga lies near the intersection of State Route 79 (SR 79) and State Route 371 (Cahuilla Road), along the historic Butterfield Overland Mail stage route. The area lies at about 1,940 feet (590 m) above mean sea level (AMSL) and is north of the Cleveland National Forest. The straight-line distance to Palomar Observatory is 5.9 miles (9.5 km) south, and the observatory site is about 3,500 feet (1,100 m) higher than the community. The town is also home to Cottonwood Elementary School (K–8) operated by the Hemet Valley Unified School District. The largest nearby city is Temecula, along the Interstate 15 corridor, about 17 miles (27 km) west of Aguanga on SR 79.

This area is in a canyon beside Temecula Creek near Pechanga tribal lands and the San Diego County line. Official U.S. Geological Survey NAD27 coordinates for the community are 33°26′34″N 116°51′51″W / 33.44278°N 116.86417°W / 33.44278; -116.86417. It is within area code 951 and shares its ZIP Code, 92536, with the San Diego County community of Holcomb Village.

According to the Köppen climate classification system, Aguanga has a hot-summer Mediterranean climate, abbreviated "Csa" on climate maps. The climate makes it significantly easier to grow olive trees, so the Temecula Olive Oil Company is based here.

Historical population

Census	Pop.	Note	%±
2010	1,128		—
2020	989		−12.3%
U.S. Decennial Census 1850–1870 1880-1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

The 2010 United States Census reported that Aguanga had a population of 1,128. The population density was 82.9 inhabitants per square mile (32.0/km). The racial makeup of Aguanga was 929 (82.4%) White (69.2% Non-Hispanic White), 11 (1.0%) African American, 20 (1.8%) Native American, 24 (2.1%) Asian, 0 (0.0%) Pacific Islander, 109 (9.7%) from other races, and 35 (3.1%) from two or more races. Hispanic or Latino of any race were 274 persons (24.3%).

The Census reported that 1,128 people (100% of the population) lived in households, 0 (0%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.

There were 470 households, out of which 81 (17.2%) had children under the age of 18 living in them, 279 (59.4%) were opposite-sex married couples living together, 33 (7.0%) had a female householder with no husband present, 22 (4.7%) had a male householder with no wife present. There were 36 (7.7%) unmarried opposite-sex partnerships, and 1 (0.2%) same-sex married couples or partnerships. 107 households (22.8%) were made up of individuals, and 65 (13.8%) had someone living alone who was 65 years of age or older. The average household size was 2.40. There were 334 families (71.1% of all households); the average family size was 2.77.

The population was spread out, with 173 people (15.3%) under the age of 18, 89 people (7.9%) aged 18 to 24, 161 people (14.3%) aged 25 to 44, 365 people (32.4%) aged 45 to 64, and 340 people (30.1%) who were 65 years of age or older. The median age was 53.4 years. For every 100 females, there were 102.5 males. For every 100 females age 18 and over, there were 104.5 males.

There were 984 housing units at an average density of 72.4 per square mile (28.0/km), of which 381 (81.1%) were owner-occupied, and 89 (18.9%) were occupied by renters. The homeowner vacancy rate was 1.3%; the rental vacancy rate was 8.2%. 881 people (78.1% of the population) lived in owner-occupied housing units and 247 people (21.9%) lived in rental housing units.

According to the 2010 United States Census, Aguanga had a median household income of $49,618, with 8.5% of the population living below the federal poverty line.

It is in the Hemet Unified School District.

• Aguanga Website and Forums about Aguanga
• ||||&item=1&index=6&nav=next Buildings of the Jake Bergman Ranch, Geddes, L. J. [Copy Print]; Unidentified Photographer. Copy of a 19th-century photograph of buildings at the Jake Bergman Ranch in Aguanga, California, early to mid-1900s. Caption: JAKE BERGMAN RANCH, AGUANGA, CENTER BUILDING IS OLD BUTTERFIELD STAGE STATION TAKEN FROM OLD PRINT. Courtesy of Southwest Museum of the American Indian Collection from ehumanitydev.pti.indiana.edu accessed June 5, 2013.