The average household size was 2.77 and the average family size was 3.02. In the city, the population was spread out with 29.5% under the age of 18, 4.6% from 18 to 24, 34.0% from 25 to 44, 22.5% from 45 to 64, and 9.4% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 99.7 males. For every 100 females age 18 and over, there were 91.8 males. The median income for a household in the city was $51,750, and the median income for a family was $61,618. Males had a median income of $37,500 versus $36,250 for females. The per capita income for the city was $22,695. About 6.3% of families and 8.2% of the population were below the poverty line, including 5.2% of those under age 18 and 13.6% of those age 65 or over. Modeled after Snellville Days in nearby Snellville, Grayson Day Festival, held annually on a Saturday at the end of April, features a parade down Main Street, food vendors, crafts, and live music. The city and local businesses sponsor the event, which takes place mostly in the centrally located Grayson City Park. The football team, marching band, and cheerleaders from Grayson High School, as well as other local organizations, politicians, and groups make the parade a favorite tradition among residents. The city of Grayson was first called Trip. In 1901, John Ellery Jacobs, the postmaster and civic leader, wrote to the post office department requesting that Trip, Georgia be changed to Berkley, Georgia. On December 6, 1901, the General Assembly of Georgia approved an act to incorporate the town and change the name. Shortly after, Ellery Jacobs was notified that there was already a Berkley, Georgia. He then suggested Graymount (because there was a clear view of Stone Mountain), but it was also taken. He then suggested the name of Grayson, Georgia. The county operates Gwinnett County Public Schools. Gwinnett County Public Library operates the Grayson Branch in Grayson.