Hispanic or Latino of any race were 454 people (12.4%). The whole population lived in households, no one lived in non-institutionalized group quarters and no one was institutionalized. There were 1,466 households, 413 (28.2%) had children under the age of 18 living in them, 898 (61.3%) were opposite-sex married couples living together, 114 (7.8%) had a female householder with no husband present, 58 (4.0%) had a male householder with no wife present. There were 92 (6.3%) unmarried opposite-sex partnerships, and 12 (0.8%) same-sex married couples or partnerships. 291 households (19.8%) were one person and 115 (7.8%) had someone living alone who was 65 or older. The average household size was 2.50. There were 1,070 families (73.0% of households); the average family size was 2.86. The age distribution was 783 people (21.3%) under the age of 18, 253 people (6.9%) aged 18 to 24, 710 people (19.3%) aged 25 to 44, 1,270 people (34.6%) aged 45 to 64, and 655 people (17.8%) who were 65 or older. The median age was 46.9 years. For every 100 females, there were 102.4 males. For every 100 females age 18 and over, there were 103.0 males. There were 2,336 housing units at an average density of 109.0 per square mile (42.1/km²),of which 1,466 were occupied, 1,089 (74.3%) by the owners and 377 (25.7%) by renters. The homeowner vacancy rate was 6.7%; the rental vacancy rate was 8.7%. 2,549 people (69.4% of the population) lived in owner-occupied housing units and 1,122 people (30.6%) lived in rental housing units. In the state legislature, Copperopolis is in , and . Federally, Copperopolis is in . Copperopolis is famous for the shack on Jack Ass Hill, where Mark Twain is supposed to have written one of his most famous works, "The Celebrated Jumping Frog of Calaveras County". Author K. Martin Gardner expounds on this literary history, and Twain's friendship with renowned scientist of the time, Nikola Tesla, in his novel "Copperopolis."