There were 2,398 households out of which 33.1% had children under the age of 18 living with them, 67.3% were married couples living together, 6.3% had a female householder with no husband present, and 23.6% were non-families. 20.1% of all households were made up of individuals and 11.9% had someone living alone who was 65 years of age or older. The average household size was 2.66 and the average family size was 3.09.
In the town the population was spread out with 24.5% under the age of 18, 4.2% from 18 to 24, 25.3% from 25 to 44, 29.4% from 45 to 64, and 16.5% who were 65 years of age or older. The median age was 43 years. For every 100 females there were 94.1 males. For every 100 females age 18 and over, there were 91.0 males.
The median income for a household in the town was $70,469, and the median income for a family was $81,370. Males had a median income of $51,925 versus $37,104 for females. The per capita income for the town was $33,056. About 2.3% of families and 2.7% of the population were below the poverty line, including 2.8% of those under age 18 and 3.9% of those age 65 or over.
As of July 2006, it is estimated that there are 7,132 (+10.6% from 2000) people in Middlebury. From 2000 to 2005, the estimated median income has risen to $77,300 (+9.7%). The estimated median home & condo value has risen to $321,100 (+61.7%).
Voter registration and party enrollment as of October 25, 2005
Voices - A local newspaper serving Southbury, Middlebury, Oxford, Seymour, Naugatuck, Woodbury, Bethelhem, New Preston, Washington, Washington Depot, Roxbury, Bridgewater, Monroe, Sandy Hook and Newtown.