According to theUnited States Census Bureau, the city has a total area of 7.1 square miles (18 km2), of which, 6.6 square miles (17 km2) of it is land and 0.5 square miles (1.3 km2) of it (6.98%) is water.[4]
The present location of Rio Vista town center is several miles south of the original settlement. Colonel Nathan H. Davis founded "Brazos del Rio" near the entrance of Cache Slough at the Sacramento River, on theRancho Los Ulpinos Mexican land grant, in 1858. The settlement was renamed "Rio Vista" before a flood in 1862 that resulted in the town moving to its present location on higher ground. The city's name combines the Spanish words for "river" and "view." Post authorities established office in 1858.[9] The community was officiallyincorporated as Rio Vista on December 30, 1893. The newspaper of record there was the River News-Herald and Isleton Journal,[10] established in 1890.[11]
From 1911 through 1992 Rio Vista was home to theUnited States Army Reserve Center, Rio Vista. The facility was initially established as a base for river control activities by theU.S. Army Corps of Engineers. During the 1950s it was used by theU.S. Army Transportation Corps to store and maintain harbor craft, and during the 1960s and 1970s it was used to prepare amphibious vehicles for transportation to Vietnam and to train troops in their use. In 1980 it was transferred to theU.S. Army Reserve and in 1992 it was closed due to aBRAC decision. The town also hosts aUnited States Coast Guard station, established in 1963.[12]
Rio Vista was visited by a losthumpback whale in 1985, despite being 60 miles (97 kilometers) up the Sacramento River from thePacific Ocean. The young whale, nicknamed "Humphrey", attracted throngs of curiosity seekers before he was eventually guided back to sea by rescuers. The Army Reserve Unit (481st Transportation Company (Heavy Boat)) was activated to use their vessels (Landing Craft Utility (LCU)) to assist in the guiding of Humphrey back to the sea. Again in May 2007, humpbacks were sighted in Rio Vista. "Delta" and "Dawn," mother and calf, stopped at least twice in the river near the town.
In 2018, a group of investors called Flannery Associates, a subsidiary ofCalifornia Forever, began purchasing most of the land surrounding Rio Vista and suing those refusing to sell Flannery their land for "constraint of trade."[13][14][15]
The census reported that 99.9% of the population lived in households, 0.1% lived in non-institutionalized group quarters, and no one was institutionalized.[17]
There were 4,881 households, out of which 14.5% included children under the age of 18, 50.9% were married-couple households, 6.0% werecohabiting couple households, 27.2% had a female householder with no partner present, and 15.9% had a male householder with no partner present. 31.6% of households were one person, and 22.0% were one person aged 65 or older. The average household size was 2.05.[17] There were 3,046families (62.4% of all households).[18]
The age distribution was 11.8% under the age of 18, 4.6% aged 18 to 24, 14.8% aged 25 to 44, 23.6% aged 45 to 64, and 45.1% who were 65years of age or older. The median age was 62.8years. For every 100 females, there were 90.6 males.[17]
There were 5,199 housing units at an average density of 787.7 units per square mile (304.1 units/km2), of which 4,881 (93.9%) were occupied. Of these, 80.9% were owner-occupied, and 19.1% were occupied by renters.[17]
In 2023, the US Census Bureau estimated that the median household income was $86,970, and theper capita income was $51,519. About 1.8% of families and 8.0% of the population were below the poverty line.[19]
At the2010 census Rio Vista had a population of 7,360. The population density was 1,037.4 inhabitants per square mile (400.5/km2). The racial makeup of Rio Vista was 6,003 (81.6%) White, 372 (5.1%) African American, 53 (0.7%) Native American, 359 (4.9%) Asian, 15 (0.2%) Pacific Islander, 288 (3.9%) from other races, and 270 (3.7%) from two or more races. Hispanic or Latino of any race were 914 people (12.4%).[20]
The census reported that 100% of the population lived in households.
There were 3,454 households, 626 (18.1%) had children under the age of 18 living in them, 1,846 (53.4%) wereopposite-sex married couples living together, 255 (7.4%) had a female householder with no husband present, 139 (4.0%) had a male householder with no wife present. There were 146 (4.2%)unmarried opposite-sex partnerships, and 24 (0.7%)same-sex married couples or partnerships. 1,045 households (30.3%) were one person and 605 (17.5%) had someone living alone who was 65 or older. The average household size was 2.13. There were 2,240 families (64.9% of households); the average family size was 2.60.
The age distribution was 1,145 people (15.6%) under the age of 18, 349 people (4.7%) aged 18 to 24, 1,089 people (14.8%) aged 25 to 44, 2,400 people (32.6%) aged 45 to 64, and 2,377 people (32.3%) who were 65 or older. The median age was 57.2 years. For every 100 females, there were 92.6 males. For every 100 females age 18 and over, there were 91.3 males.
There were 3,890 housing units at an average density of 548.3 units per square mile (211.7 units/km2), of which 77.7% were owner-occupied and 22.3% were occupied by renters. The homeowner vacancy rate was 2.7%; the rental vacancy rate was 13.7%. 75.1% of the population lived in owner-occupied housing units and 24.9% lived in rental housing units.
The Trilogy at Rio Vista development, aimed at active adults, is a mile northwest of the original city on theRio Vista Highway (SR 12). It is built around the 18-hole Rio Vista Golf Club. There will be between 2,800 and 3,000 homes when Trilogy is complete.
Natural gas was discovered in the Rio Vista area in 1936[21] and theRio Vista Field, (RVGU Rio Vista Gas Unit ) at one time there was a gas well behind RV City Hall in the middle of boat launch parking lot. Amerada Hess Corporation was the first major operations. When Amerada sold out to Sheridan Energy another buy out would soon take shape by Calpine Natural Gas. Calpine fell into the energy collapse when Enron went under then Calpine sold off a majority of its natural gas holdings to Rosetta Resources. Next buyer was Vintage Petroleum who sold out to and currently running operations California Resources Corporation as of 2022. Same address since 1936. Rio Vista Gas Unit was the largest natural gas field in California, became a major source of employment for the remainder of the 20th century. Other industries include agriculture, manufacturing and tourism. There are over 750wind turbines belonging to the threerenewable energy projects (Shiloh Wind Power Plant,NextEra Energy Resources' High Winds Energy Center and one owned by the Sacramento Municipal Utility District) on theMontezuma Hills, close to the city. There are plans to add an additional 200 wind turbines.
Rio Vista is home to the largest American producer ofBelgian endive[22] in the United States.Craig Breedlove, five-time world land speed record holder, lived in and had an engineering facility in the city.