Mercer County, New Jersey

Geography According to the U.S. Census Bureau, the county has a total area of 593 km² (229 mi²). 585 km² (226 mi²) of it is land and 8 km² (3 mi²) of it is water. The total area is 1.27% water.

Demographics As of the census of 2000, there are 350,761 people, 125,807 households, and 86,303 families residing in the county. The population density is 599/km² (1,552/mi²). There are 133,280 housing units at an average density of 228/km² (590/mi²). The racial makeup of the county is 68.48% White, 19.81% African American, 0.20% Native American, 4.94% Asian, 0.10% Pacific Islander, 4.29% from other races, and 2.17% from two or more races. 9.66% of the population are Hispanic or Latino of any race.

There are 125,807 households out of which 32.80% have children under the age of 18 living with them, 50.60% are married couples living together, 13.80% have a female householder with no husband present, and 31.40% are non-families. 25.60% of all households are made up of individuals and 9.90% have someone living alone who is 65 years of age or older. The average household size is 2.62 and the average family size is 3.16.

In the county the population is spread out with 24.00% under the age of 18, 10.20% from 18 to 24, 30.60% from 25 to 44, 22.50% from 45 to 64, and 12.60% who are 65 years of age or older. The median age is 36 years. For every 100 females there are 94.90 males. For every 100 females age 18 and over, there are 92.00 males.

The median income for a household in the county is $56,613, and the median income for a family is $68,494. Males have a median income of $47,444 versus $34,788 for females. The per capita income for the county is $27,914. 8.60% of the population and 5.90% of families are below the poverty line. Out of the total people living in poverty, 10.60% are under the age of 18 and 8.40% are 65 or older.

Cities and Towns

• East Windsor Township
• Ewing Township
• Ewing
• Hamilton Township
• Hightstown
• Hopewell Township
• Hopewell
• Lawrence Township
• Lawrenceville
• Mercerville-Hamilton Square
• Pennington
• Princeton Junction
• Princeton North
• Princeton Township
• Princeton
• Trenton
• Twin Rivers
• Washington Township
• West Windsor Township
• White Horse
• Yardville-Groveville