There were 6,921 households out of which 30.90 % had children under the age of 18 living with them , 55.60 % were married couples living together , 10.80 % had a female householder with no husband present , and 29.30 % were not related . There were 6,921 households out of which 30.90 % had children under the age of 18 living with them , 55.60 % were married couples living together , 10.80 % had a female householder with no husband present , and 29.30 % were non-families .