Hispanic or Latino of any race made up 4.95% of the population.There were 4,840 households out of which 29.5% had children under the age of 18 living with them, 47.3% were married couples living together, 9.6% had a female householder with no husband present, and 39.9% were non-families.Located in a valley and bisected by Interstate 90, the city is bordered by the Sammamish Plateau to the north and the Issaquah Alps to the south.
They believe that these three mountains are the remains of a much older mountain range long since eroded by earthquakes, volcanic action, and shifting plates.31.0% of all households were made up of individuals and 7.8% had someone living alone who was 65 years of age or older.The average household size was 2.27 and the average family size was 2.87. For every 100 females age 18 and over, there were 88.1 males.According to a 2012 estimate, the median income for a household in the city was ,074, and the median income for a family was 5,814. According to the Washington State Office of Financial Management, Issaquah ranked 6th of 279 eligible incorporated communities in population growth between 20.).The racial makeup of the city was 74.7% White, 1.4% African American, 0.4% Native American, 17.5% Asian, 0.1% Pacific Islander, 1.8% from other races, and 4.1% from two or more races.
In the city the population was spread out with 22.2% under the age of 18, 7.3% from 18 to 24, 36.5% from 25 to 44, 24.0% from 45 to 64, and 10.0% who were 65 years of age or older. The median income for a household in the city was $57,892, and the median income for a family was $77,274.