Sunnyside-Tahoe City is located at 39°9'1" North, 120°8'59" West (39.150272, -120.149794)Template:GR.
As of the censusTemplate:GR of 2000, there are 1,761 people, 789 households, and 362 families residing in the CDP. The population density is 199.4/km² (515.8/mi²). There are 2,102 housing units at an average density of 238.0/km² (615.7/mi²). The racial makeup of the CDP is 95.34% White, 0.28% African American, 0.40% Native American, 1.31% Asian, 0.11% Pacific Islander, 0.45% from other races, and 2.10% from two or more races. 3.63% of the population are Hispanic or Latino of any race.
There are 789 households out of which 20.8% have children under the age of 18 living with them, 37.9% are married couples living together, 4.6% have a female householder with no husband present, and 54.1% are non-families. 30.0% of all households are made up of individuals and 3.7% have someone living alone who is 65 years of age or older. The average household size is 2.23 and the average family size is 2.75.
In the CDP the population is spread out with 15.9% under the age of 18, 7.4% from 18 to 24, 45.0% from 25 to 44, 25.7% from 45 to 64, and 6.0% who are 65 years of age or older. The median age is 36 years. For every 100 females there are 128.4 males. For every 100 females age 18 and over, there are 132.5 males.
The median income for a household in the CDP is $56,875, and the median income for a family is $79,412. Males have a median income of $41,136 versus $25,833 for females. The per capita income for the CDP is $33,534. 5.5% of the population and 1.1% of families are below the poverty line. Out of the total population, 0.0% of those under the age of 18 and 0.0% of those 65 and older are living below the poverty line.