Here are some interesting stats from Yahoo on my neighborhood (1st column is for my neighborhood, 2nd column is national average):

Population of Mountain View:	28211	9184
Median Age:	34.47 years	35.29 years
Median Household Income:	$67508	$36766.47
	Percentage of Single Households:	48.88%	39.34%
Percentage of Married Households:	51.12%	60.38%
Percentage Families (households with children):	65.92%	72.79%
Average Household Size:	2.35 people	2.63 people
Percentage College or Better:	50.77%	20.90%
Percentage White Collar:	71.62%	45.40%

There's lots more information as well. You can enter your own address and see what your neighborhood stats are. (Link from bad hair days)