Lake Wylie is located on a peninsula along the shore of Lake Wylie in the Piedmont of both North and South Carolina, at . According to the United States Census Bureau, the CDP has a total area of, of which is land and is water. The average elevation of the town was 512 feet. As a result of the community's proximity to the state line between North and South Carolina, it has been significantly affected by recent efforts to resurvey the state line using modern global positioning system technology. The process shifted the state line approximately southward in the Lake Wylie area, resulting in several properties in the community now being located in South Point Township in North Carolina — including one property where the new state line falls between the owner's house and his back deck, and a gas station and convenience store whose owner has noted that differences in gas prices and retail regulations between the two states will likely force him out of business.
Climate
Lake Wylie has a humid subtropical climate, characterized by humid summers and cool dry winters. Precipitation does not vary greatly by amount between seasons with snow, rain, and sleet in the winter months and mostly rain in the summer months with occasional hail from strong thunderstorms. July is the hottest month, with an average high temperature of below and an average low temperature of around. The coldest month of the year is January, when the average high temperature is below and the average low temperature is below.
Demographics
As of the census of 2010, there were 8,841 people, 1,458 households, and 1,039 families residing in the CDP. The population density was 880.6 people per square mile. There were 1,610 housing units at an average density of 463.1/sq mi. The racial makeup of the CDP was 97.68% White, 1.05% African American, 0.26% Native American, 0.75% Asian, 0.07% from other races, and 0.02% from two or more races. Hispanic or Latino of any race were 0.82% of the population. There were 1,458 households, out of which 16.5% had children under the age of 18 living with them, 66.3% were married couplesliving together, 3.8% had a female with no husband present, and 28.7% were non-families. 24.5% of all households were made up of individuals, and 8.2% had someone living alone who was 65 years of age or older. The average household size was 2.10 and the average family size was 2.47. In the CDP, the population was spread out, with 13.5% under the age of 18, 4.4% from 18 to 24, 21.9% from 25 to 44, 36.9% from 45 to 64, and 23.4% who were 65 years of age or older. The median age was 51 years. For every 100 females, there were 98.0 males. For every 100 females age 18 and over, there were 96.8 males. The median income for a household in the CDP was $76,819, and the median income for a family was $88,208. Males had a median income of $50,208 versus $32,679 for females. The per capita income for the CDP was $43,567. None of the families and 0.8% of the population were living below the poverty line, including no under eighteens and none of those over 64. Lake Wylie's population grew to around 12,000 during the 2010s, as younger families were drawn there from all over the nation by low tax rates and the local schools. As a result local infrastructure such as the roads and the water supply system were stressed by the demand, with traffic congestion regularly occurring on local roads and frequent boil-water advisories. York County has declared a moratorium on all new construction in order to better plan the area's development.
Education
Lake Wylie has a public library, a branch of the York County Library.
