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Riverdale (formerly, Liberty Settlement) at an elevation of above mean sea level.
Geography
According to the United States Census Bureau, the CDP has a total area of , all of it land.
History
The first post office at Riverdale opened in 1875.
Demographics
Riverdale first appeared as an unincorporated place in the 1960 U.S. census;
!Pop 2010
!style="background-color: #ffffb3;" |Pop 2020
!% 2000
!% 2010
!style="background-color: #ffffb3;" |% 2020
|-
|White alone (NH)
|977
|920
|style='background: #ffffe6; |720
|40.44%
|29.18%
|style='background: #ffffe6; |20.71%
|-
|Black or African American alone (NH)
|28
|30
|style='background: #ffffe6; |24
|1.16%
|0.95%
|style='background: #ffffe6; |0.69%
|-
|Native American or Alaska Native alone (NH)
|15
|14
|style='background: #ffffe6; |13
|0.62%
|0.44%
|style='background: #ffffe6; |0.37%
|-
|Asian alone (NH)
|43
|22
|style='background: #ffffe6; |17
|1.78%
|0.70%
|style='background: #ffffe6; |0.49%
|-
|Native Hawaiian or Pacific Islander alone (NH)
|3
|4
|style='background: #ffffe6; |1
|0.12%
|0.13%
|style='background: #ffffe6; |0.03%
|-
|Other race alone (NH)
|6
|4
|style='background: #ffffe6; |13
|0.25%
|0.13%
|style='background: #ffffe6; |0.37%
|-
|Mixed race or Multiracial (NH)
|110
|53
|style='background: #ffffe6; |98
|4.55%
|1.68%
|style='background: #ffffe6; |2.82%
|-
|Hispanic or Latino (any race)
|1,234
|2,106
|style='background: #ffffe6; |2,591
|51.08%
|66.79%
|style='background: #ffffe6; |74.52%
|-
|Total
|2,416
|3,153
|style='background: #ffffe6; |3,477
|100.00%
|100.00%
|style='background: #ffffe6; |100.00%
|}
2020 census
As of the 2020 census, Riverdale had a population of 3,477 and a population density of . The whole population lived in households. 0.0% of residents lived in urban areas, while 100.0% lived in rural areas.
The racial makeup of Riverdale was 34.3% White, 1.2% African American, 1.5% Native American, 0.5% Asian, 0.1% Pacific Islander, 40.8% from other races, and 21.7% from two or more races. Hispanic or Latino of any race were 74.5% of the population.
The age distribution was 32.5% under the age of 18, 10.4% aged 18 to 24, 26.6% aged 25 to 44, 20.4% aged 45 to 64, and 10.1% who were 65 years of age or older. The median age was 29.8 years. For every 100 females, there were 101.7 males, and for every 100 females age 18 and over, there were 100.0 males age 18 and over.
2010 census
The 2010 United States census reported that Riverdale had a population of 3,153. The population density was . The racial makeup of Riverdale was 1,826 (57.9%) White, 33 (1.0%) African American, 59 (1.9%) Native American, 27 (0.9%) Asian, 5 (0.2%) Pacific Islander, 1,051 (33.3%) from other races, and 152 (4.8%) from two or more races. Hispanics or Latinos of any race were 2,106 persons (66.8%).
The census reported that 3,153 people (100% of the population) lived in households, none (0%) lived in noninstitutionalized group quarters, and none (0%) were institutionalized.
Of the 845 households, 482 (57.0%) had children under 18 living in them, 552 (65.3%) were opposite-sex married couples living together, 116 (13.7%) had a female householder with no husband present, 46 (5.4%) had a male householder with no wife present, 52 (6.2%) were unmarried opposite-sex partnerships, and 2 (0.2%) were same-sex married couples or partnerships; 104 households (12.3%) were made up of individuals, and 63 (7.5%) had someone living alone who was 65 or older. The average household size was 3.73. There were 714 families (84.5% of all households); the average family size was 4.09.
The age distribution was 1,111 people (35.2%) were under 18, 352 people (11.2%) were 18 to 24, 814 people (25.8%) were 25 to 44, 614 people (19.5%) were 45 to 64, and 262 people (8.3%) were 65 or older. The median age was 27.6 years. For every 100 females, there were 99.7 males. For every 100 females 18 and over, there were 95.6 males.
The 918 housing units had an average density of , of which 845 were occupied and 509 (60.2%) were owner-occupied, and 336 (39.8%) were occupied by renters. The homeowner vacancy rate was 3.4%; the rental vacancy rate was 9.9%. In total, 1,879 people (59.6% of the population) lived in owner-occupied housing units and 1,274 people (40.4%) lived in rental housing units.
Education and Government
The Riverdale Joint Unified School District<!--Census code UNI 00040--> is the school district for Riverdale CDP.
In the United States House of Representatives, Riverdale is in California's 13th congressional district, represented by Democrat Adam Gray as of January 2025.
Famous resident
- Alan Autry, a former Green Bay Packers quarterback, cast member of the television series In the Heat of the Night, and former mayor of Fresno, California, moved to Riverdale in the mid-1960s.