According to the 2010 United States Census, Monterey had a population of 27,810 residents. Of the population, Monterey had 2,364 people per square mile. 91% of those people lived in households; where as 7.9% of those people lived in non-institutionalized group housing. 1.1% of the population was institutionalized.
In 2010, 20.3% of households had children under the age of 18 living within them. 38.5% of the households were opposite-sex married couples, 7.4% had a female head-of-house with no male counterpart, and 3% had a male head-of-house with no female counterpart. At the time, 5.7% of the residents were unmarried opposite-sex relationships, and .9% were same-sex married couples or partnerships. 39.2% of the households in Monterey were made up of individuals, 11.8% had someone living alone who was 65 years of age or older.
The average household size was 2.08, and the average family size was 2.81.
The racial make-up of Monterey in 2010 was as follows: 78.3% white residents, 13.7% Hispanic or Latino residents, 7.9% Asian residents, 2.8% black residents, .5% Native American residents, and .3% Pacific Islander residents. 5.1% of Monterey residents identified as two or more races, and 5% of residents identified as “other races.”