As of the 2010 United States Census, there were 101,108 people, 36,867 households, and 26,681 families living in the county.[28] The population density was 292.0 inhabitants per square mile (112.7/km2). There were 41,103 housing units at an average density of 118.7 per square mile (45.8/km2).[29] The racial makeup of the county was 89.2% white, 6.2% black or African American, 1.1% Asian, 0.3% American Indian, 1.0% from other races, and 2.2% from two or more races. Those of Hispanic or Latino origin made up 3.4% of the population.[28][30]
Of the 36,867 households, 36.8% had children under the age of 18 living with them, 54.7% were married couples living together, 12.0% had a female householder with no husband present, 27.6% were non-families, and 21.8% of all households were made up of individuals. The average household size was 2.70 and the average family size was 3.13. The median age was 38.9 years.[28]
The median income for a household in the county was $64,886 and the median income for a family was $75,742. Males had a median income of $54,379 versus $39,933 for females. The per capita income for the county was $28,640. About 6.3% of families and 9.0% of the population were below the poverty line, including 12.2% of those under age 18 and 7.8% of those age 65 or over.[31]
Cecil County is home to a small Amish community in the Cecilton area that was founded in 1999.[32] Amish families moved to the area from Lancaster County, Pennsylvania because of increasing costs and the declining amount of farmland there.[33]
Cecil County is also home to another winner of Maryland's $40,000 COVID-19 lottery.