Charles County is located in the southern central portion of the U.S. state of Maryland. As of the 2010 census, the population was 146,551. The county seat is La Plata. The county was named for Charles Calvert (1637–1715), third Baron Baltimore.
According to the U.S. Census Bureau, the county has a total area of 643 square miles (1,670 km), of which 458 square miles (1,190 km) is land and 185 square miles (480 km) (29%) is water.
In its western wing, along the southernmost bend in Maryland Route 224, Charles County contains a rare instance where the traveler is due north, east, south, and west of the same state—Virginia.
As of the census of 2000, there were 120,546 people, 41,668 households, and 32,292 families residing in the county. The population density was 262 people per square mile (101/km²). There were 43,903 housing units at an average density of 95 per square mile (37/km²). The racial makeup of the county was 68.51% White, 26.06% Black or African American, 0.75% Native American, 1.82% Asian, 0.06% Pacific Islander, 0.72% from other races, and 2.08% from two or more races. 2.26% of the population were Hispanic or Latino of any race. 11.6% were of German, 10.8% Irish, 10.2% English, 9.3% American and 5.3% Italian ancestry.
There were 41,668 households out of which 41.10% had children under the age of 18 living with them, 58.00% were married couples living together, 14.50% had a female householder with no husband present, and 22.50% were non-families. 17.20% of all households were made up of individuals and 5.20% had someone living alone who was 65 years of age or older. The average household size was 2.86 and the average family size was 3.21.
In the county, the population was spread out with 28.70% under the age of 18, 7.60% from 18 to 24, 33.20% from 25 to 44, 22.70% from 45 to 64, and 7.80% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 95.50 males. For every 100 females age 18 and over, there were 92.20 males.
The median income for a household in the county was $62,199, and the median income for a family was $67,602 (these figures had risen to $80,573 and $89,358 respectively as of a 2007 estimate). Males had a median income of $43,371 versus $34,231 for females. The per capita income for the county was $24,285. About 3.70% of families and 5.50% of the population were below the poverty line, including 6.70% of those under age 18 and 8.60% of those age 65 or over.
As of 2010 the county population’s racial makeup was 48.38% Non-Hispanic whites, 40.96% blacks, 0.65% Native Americans, 2.98% Asian, 0.07% Pacific Islanders, 0.17% Non-Hispanics of some other race, 3.20% Non-Hispanics reporting more than one race and 4.27% Hispanic.
As of the 2010 United States Census, there were 146,551 people, 51,214 households, and 38,614 families residing in the county. The population density was 320.2 inhabitants per square mile (123.6/km). There were 54,963 housing units at an average density of 120.1 per square mile (46.4/km). The racial makeup of the county was 50.3% white, 41.0% black or African American, 3.0% Asian, 0.7% American Indian, 0.1% Pacific islander, 1.3% from other races, and 3.7% from two or more races. Those of Hispanic or Latino origin made up 4.3% of the population. In terms of ancestry, 12.6% were German, 10.8% were Irish, 8.7% were English, 6.3% were American, and 5.1% were Italian.
Of the 51,214 households, 41.6% had children under the age of 18 living with them, 54.2% were married couples living together, 16.3% had a female householder with no husband present, 24.6% were non-families, and 19.8% of all households were made up of individuals. The average household size was 2.83 and the average family size was 3.24. The median age was 37.4 years.
The median income for a household in the county was $88,825 and the median income for a family was $98,560. Males had a median income of $62,210 versus $52,477 for females. The per capita income for the county was $35,780. About 3.7% of families and 5.2% of the population were below the poverty line, including 6.8% of those under age 18 and 4.6% of those age 65 or over.