The 2010 United States Census reported that Mono City had a population of 172. The population density was 31.7 people per square mile. The racial makeup of Mono City was 156 White, 0 African American, 1 Native American, 2 Asian, 0 Pacific Islander, 2 from other races, and 11 from two or more races. Hispanic or Latino of any race were 37 persons. The Census reported that 172 people lived in households, 0 lived in non-institutionalized group quarters, and 0 were institutionalized. There were 63 households, out of which 21 had children under the age of 18 living in them, 44 were opposite-sex married couplesliving together, 1 had a female householder with no husband present, 3 had a male householder with no wife present. There were 6 unmarried opposite-sex partnerships, and 0 same-sex married couples or partnerships. 8 households were made up of individuals and 2 had someone living alone who was 65 years of age or older. The average household size was 2.73. There were 48 families ; the average family size was 2.94. The population was spread out with 41 people under the age of 18, 7 people aged 18 to 24, 48 people aged 25 to 44, 61 people aged 45 to 64, and 15 people who were 65 years of age or older. The median age was 41.0 years. For every 100 females, there were 91.1 males. For every 100 females age 18 and over, there were 95.5 males. There were 94 housing units at an average density of 17.3 per square mile, of which 45 were owner-occupied, and 18 were occupied by renters. The homeowner vacancy rate was 0%; the rental vacancy rate was 0%. 126 people lived in owner-occupied housing units and 46 people lived in rental housing units.
2000
The 2000 United States Census reported the population of Mono City to be 126. In 2000, 8.7% of the population was under 5 years old, 13% were from 5 to 17, 68% were from 18 to 64, and 8.7% were over 65. Seventy-nine percent of the households were owner occupied and 21% were rented. The California Department of Finance projects the population to increase to 159 by 2020 and to 171 in 2030.
Mono City is the seat of the Mono City Fire Protection District, which was established in 1972. The fire protection district covers an area of approximately.
