Troy was platted in 1819. Some say the community was named after Troy, New York, while others believe the name is a transfer from Troy, Vermont. An early variant name was Woods Fort. A post office called Troy has been in operation since 1823.
Troy is located two miles west of the Cuivre River. U.S. 61 passes the east side of the city and Missouri Route 47 passes through the north side. According to the United States Census Bureau, the city has a total area of, of which is land and is water.
As of the census of 2010, there were 10,542 people, 3,843 households, and 2,727 families living in the city. The population density was. There were 4,141 housing units at an average density of. The racial makeup of the city was 92.5% White, 3.1% African American, 0.4% Native American, 0.7% Asian, 0.8% from other races, and 2.4% from two or more races. Hispanic or Latino of any race were 3.0% of the population. There were 3,843 households of which 43.6% had children under the age of 18 living with them, 50.5% were married couples living together, 14.8% had a female householder with no husband present, 5.6% had a male householder with no wife present, and 29.0% were non-families. 24.4% of all households were made up of individuals and 10.1% had someone living alone who was 65 years of age or older. The average household size was 2.67 and the average family size was 3.16. The median age in the city was 32.2 years. 30.5% of residents were under the age of 18; 7.7% were between the ages of 18 and 24; 30.4% were from 25 to 44; 19.6% were from 45 to 64; and 11.8% were 65 years of age or older. The gender makeup of the city was 47.4% male and 52.6% female.
2000 census
As of the census of 2000, there were 6,737 people, 2,521 households, and 1,747 families living in the city. The population density was 1,134.5 people per square mile. There were 2,661 housing units at an average density of 448.1 per square mile. The racial makeup of the city was 93.87% White, 2.86% African American, 0.39% Native American, 0.13% Asian, 0.01% Pacific Islander, 0.80% from other races, and 1.93% from two or more races. Hispanic or Latino of any race were 1.71% of the population. There were 2,521 households out of which 39.8% had children under the age of 18 living with them, 51.6% were married couples living together, 14.6% had a female householder with no husband present, and 30.7% were non-families. 26.6% of all households were made up of individuals and 12.5% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 3.10. In the city, the population was spread out with 29.8% under the age of 18, 9.2% from 18 to 24, 30.6% from 25 to 44, 16.4% from 45 to 64, and 14.0% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 87.1 males. For every 100 females age 18 and over, there were 83.7 males. The median income for a household in the city was $40,332, and the median income for a family was $46,818. Males had a median income of $34,750 versus $24,440 for females. The per capita income for the city was $17,666. About 7.6% of families and 11.0% of the population were below the poverty line, including 13.4% of those under age 18 and 14.6% of those age 65 or over.
