How many on-campus college students are there in the United States?  I
know there are 16 million to 18 million total college students in the
US.  I want to know how many live on-campus in university dorms.  I
would like to have two data sources confirming the number.

According to the most recent data from the U.S. Census Bureau, a total
of 2,064,130 people live in college dormitories.

Source:
Population in Group Quarters by Type, Sex and Age, for the United States: 2000 
Table 1. Population in Group Quarters by Type, Sex and Age, for the United States
Internet release date: November 10, 2003
http://www.census.gov/population/cen2000/phc-t26/tab01.pdf



From an article in The Chronicle Review dated November 21, 2003

1.8 million Students live in dorms.

Excerpt:

?But the so-called wired students are those undergraduates fortunate
enough to live in dorms -- about 1.8 million students -- not the many
part-time students who live at home, or the full-time juniors,
seniors, and graduate students at public institutions that typically
provide dorm rooms only for freshmen and sophomores. Off-campus
students, like most consumers who have dial-up Internet accounts with
AOL, Earthlink, or MSN, typically have only slow connections to the
Internet.?

Section: The Chronicle Review
Volume 50, Issue 13, Page B16 
http://chronicle.com/free/v50/i13/13b01601.htm



?According to the American Council on Education (ACE), about 20
percent of the 14.5 million college students in the U.S. live on
campus.?

That would be 2,900,000 college students living on campus.

The CollegeBound Network: 2001
http://www.collegebound.net/corporate/aboutus/pr/flpress39.html



?In terms of living arrangements, 30 percent of all beginning students
live on campus, 27 percent live off campus, and 43 percent live with
their parents or other relatives. Most two-year and less-than-two-year
institutions do not offer on-campus student housing. At four-year
institutions, almost two-thirds of beginning students live on campus."

American Council on Education: 2002
http://www.acenet.edu/bookstore/pdf/2002_crucial_choices.pdf



Search criteria:
Million college students ?live on campus"
"Million college students" "live on campus"
Million students live "in dorms" OR " on campus"
 Percent OR % college students live million live on-campus
""College students" living arrangements"
?*percent of * students" "live on-campus"

I hope you find this helpful! 

Best regards,
Bobbie7

Very clear answer with reference sources of exactly the data that I
wanted to see and had trouble finding myself.  All credibly sources. 
I asked for 2 data sources and got 4.  I'm very pleased.

Thank you for the five star rating and tip!
Best regards,
Bobbie7