Tara Hills first appeared as a census-designated place in the 1990 United States census.
!Pop 2010
!style="background-color: #ffffb3;" |Pop 2020
!% 2000
!% 2010
!style="background-color: #ffffb3;" |% 2020
|-
|White alone (NH)
|2,299
|1,453
|style='background: #ffffe6; |1,146
|43.12%
|28.35%
|style='background: #ffffe6; |21.36%
|-
|Black or African American alone (NH)
|757
|658
|style='background: #ffffe6; |594
|14.20%
|12.84%
|style='background: #ffffe6; |11.07%
|-
|Native American or Alaska Native alone (NH)
|25
|11
|style='background: #ffffe6; |18
|0.47%
|0.21%
|style='background: #ffffe6; |0.34%
|-
|Asian alone (NH)
|752
|864
|style='background: #ffffe6; |1,112
|14.10%
|16.86%
|style='background: #ffffe6; |20.73%
|-
|Native Hawaiian or Pacific Islander alone (NH)
|27
|17
|style='background: #ffffe6; |15
|0.51%
|0.33%
|style='background: #ffffe6; |0.28%
|-
|Other race alone (NH)
|11
|20
|style='background: #ffffe6; |41
|0.21%
|0.39%
|style='background: #ffffe6; |0.76%
|-
|Mixed race or Multiracial (NH)
|188
|156
|style='background: #ffffe6; |233
|3.53%
|3.04%
|style='background: #ffffe6; |4.34%
|-
|Hispanic or Latino (any race)
|1,273
|1,947
|style='background: #ffffe6; |2,205
|23.87%
|37.98%
|style='background: #ffffe6; |41.11%
|-
|Total
|5,332
|5,126
|style='background: #ffffe6; |5,364
|100.00%
|100.00%
|style='background: #ffffe6; |100.00%
|}
2020 census
As of the 2020 census, Tara Hills had a population of 5,364. The population density was . The racial makeup of Tara Hills was 26.4% White, 11.3% African American, 1.5% Native American, 21.0% Asian, 0.3% Pacific Islander, 25.4% from other races, and 14.1% from two or more races. Hispanic or Latino people of any race were 41.1% of the population.
Income and poverty
In 2023, the US Census Bureau estimated that the median household income was $116,415, and the per capita income was $45,330.
Commerce
The neighborhood is near two shopping centers.
The eastern and upper border has Pinole Square (previously known as Appian 80) at the intersection of Appian Way and I-80.
At the west end near San Pablo Bay, the Spectrum Center Tara Hills Campus occupies most of the Tara Hills old Shopping Center.
San Pablo Avenue borders the northwest side of the neighborhood and is home to many businesses.
Education
Tara Hills is in the West Contra Costa Unified School District.