As of the census² of 2000, there were 89,215 people, 31,442 households, and 24,713 families residing in the county. The population density was 78/km² (202/mi²). There were 33,182 housing units at an average density of 29/km² (75/mi²). The racial makeup of the county was 78.86% White, 17.97% Black or African American, 0.23% Native American, 0.68% Asian, 0.01% Pacific Islander, 1.22% from other races, and 1.02% from two or more races. 3.14% of the population were Hispanic or Latino of any race.

In the county the population was spread out with 28.70% under the age of 18, 7.60% from 18 to 24, 33.40% from 25 to 44, 21.80% from 45 to 64, and 8.50% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 98.00 males. For every 100 females age 18 and over, there were 95.40 males.

The median income for a household in the county was $52,706, and the median income for a family was $58,750. Males had a median income of $41,369 versus $27,322 for females. The per capita income for the county was $21,949. About 6.10% of families and 7.80% of the population were below the poverty line, including 9.60% of those under age 18 and 10.50% of those age 65 or over.

Neighboring areas include the following: Fulton County, Fayette County, Spalding County, Meriwether County, Troup County, Heard County, and Carroll County. The cities and towns of Coweta County are Corinth, East Newnan, Grantville, Haralson, Moreland, Newnan, Palmetto, Senoia, Sharpsburg, and Turin.