The 2010 United States Census stated there were 13, 100 people, 4, 498 households, and 2, 889 families moving into the city, with a citizenry density of 6, 894. 7 people per square mile (2, 673. 5/km²). The racial makeup of the city was 38. 0% White, 46. 4% African American, 0. 5% Indigenous American, 0. 8% Asian, 0. 1% Pacific Islander, 8. 9% from other races, and 5. 3% from two or more races. Hispanic or Latino of any race were 23. 0% of the population.

There were 4, 498 households, out that 36. 5% had young ones under the age of 18 living with them, 28. 3% were married couples living together, 27. 7% had women householder with no spouse present, 8. 2% had a male householder with no spouse present, and 35. 8% were nonfamilies. 42. 4% of all households had individuals under 18 living in them, and 19. 5% had someone living alone who had been 65 years of age or older. The average household size was 2 . 86 and the typical family size was 3. 46.

In the city the people was spread out, with 30. 4% under the age of 18. The median age was 31 years. The people was 50. 6% female and 49. 4% male.

Coatesville had 4, 998 housing units, of which 90. 2% were occupied. Of the occupied housing units, 37. 5% were owner-occupied.

In 2000, the median income for a household in the city was $29, 912, and the median income for a family was $36, 375. Males had a median income of $31, 782 versus $24, 774 for females. The per capita income for the town was $14, 079. About 18. 3% of families and 22. 1% of the population were below the poverty line, including 28. 9% of those under age 18 and 15. 9% of those age 65 or higher.