The city is home to about 150,000 residents and a wide variety of businesses, including General Motors' Technical Center. The current mayor is Mr. Mark Steenbergh.
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It is a six mile by six mile (10 km) square in the southwest corner of Macomb County in suburban Detroit. The city of Center Line is enclosed within Warren. Other cities bordering on Warren are Detroit, Hazel Park, Madison Heights, Sterling Heights, Roseville and Eastpointe.
According to the United States Census Bureau, the city has a total area of 88.9 km² (34.3 mi²). 88.8 km² (34.3 mi²) of it is land and 0.1 km² (0.04 mi²) of it is water. The total area is 0.09% water.
As of the census of 2000, there are 138,247 people, 55,551 households, and 36,719 families residing in the city. The population density is 1,556.6/km² (4,031.8/mi²). There are 57,249 housing units at an average density of 644.6/km² (1,669.6/mi²). The racial makeup of the city is 91.29% White, 2.67% African American, 0.36% Native American, 3.09% Asian, 0.02% Pacific Islander, 0.34% from other races, and 2.23% from two or more races. 1.35% of the population are Hispanic or Latino of any race.
There are 55,551 households out of which 27.8% have children under the age of 18 living with them, 49.7% are married couples living together, 11.7% have a female householder with no husband present, and 33.9% are non-families. 28.8% of all households are made up of individuals and 12.0% have someone living alone who is 65 years of age or older. The average household size is 2.47 and the average family size is 3.05.
In the city the population is spread out with 22.9% under the age of 18, 7.6% from 18 to 24, 30.8% from 25 to 44, 21.4% from 45 to 64, and 17.3% who are 65 years of age or older. The median age is 38 years. For every 100 females there are 95.6 males. For every 100 females age 18 and over, there are 92.1 males.
The median income for a household in the city is $44,626, and the median income for a family is $52,444. Males have a median income of $41,454 versus $28,368 for females. The per capita income for the city is $21,407. 7.4% of the population and 5.2% of families are below the poverty line. Out of the total people living in poverty, 9.5% are under the age of 18 and 5.8% are 65 or older.