Hello Crossingmyfinger, Contrary to Agladhad's assertion, I would submit to you that all the service academies are more diverse than the typical liberal arts college in some areas and less in others.
Geographically: Take a look at this interactive map complied by the Chronicle of higher education:
HTML:
http://chronicle.com/article/Interactive-Freshman-Class/129547/#id=197036
As you know there is a geographic diversity built into the selection process due to the congressional nomination selection. With this map you can search by college name and then click the play function to see where students came from over the last 10 years
Income: Addtionally, the service academies draw from a more diverse income group than the typical LAC. There are no financial barriers to entry to the service academies. It is true that highly endowed private universities and LAC can meet the financial needs of their students without the use of loans but the vast majority of schools rely on students incurring substantial student loans to attend.
Students from non traditional education backgrounds (older students) The service academies make a huge effort to attract prior service candidates. This brings into our academies cadets with non-traditional backgrounds a group totally unrepresented in the LAC student body.
Racially Below are the freshman student profiles from the College Board of each service academy. All 3 service academies are about 19% black and Hispanic. Here is a sample of some top Liberal arts colleges freshman statistics of the percentage of black and hispanic enrollment, asian enrollment and enrollment of women. I omitted students who are of more than one race as I wasn't sure if they were already represented in the totals below..
Amherst College 24%, 11% asian, 51% women
Bard College 5%, 3% asian, 60% women
Bates College 10%, 4% asian, 52%women
Colgate College 12%, 3%asian, 53% women
Connecticut College 11%, 3% asian, 61% women
Davidson College 12%, 4% asian, 50% women
Harvey Mudd 8%, 19% asian, 42% women
Kenyon College 7%, 8% asian, 56% women
Macalester College 10%, 6% asian, 60% women
Pomona College 21%, 10% asian, 52% women
Skidmore College 11%, 6% asian, 57% women
Swarthmore College 22%, 13% asian, 52% women
Vassar College 17%, 9%,55% women
Wellesley College 12%, 23% asian, 100% women
Wesleyan College 19%, 10%, 50%
Williams College 20%, 10% asian, 51% women
USMA:
Student Body
1st-year students:
7% In-state students
93% Out-of-state students
16% Women
84% Men
1% American Indian or Alaska Native
5% Asian
9% Black or African American
10% Hispanic/Latino
1% Native Hawaiian/Pacific Islander
68% White
4% Two or more races
1% Non-Resident Alien
48% in top 10th of graduating class
75% in top quarter of graduating class
96% in top half of graduating class
USNA:
1st-year students:
7% In-state students
93% Out-of-state students
19% Women
81% Men
1% American Indian or Alaska Native
6% Asian
8% Black or African American
11% Hispanic/Latino
1% Native Hawaiian/Pacific Islander
65% White
7% Two or more races
1% Non-Resident Alien
52% in top 10th of graduating class
79% in top quarter of graduating class
94% in top half of graduating class
USAFA:
1st-year students:
7% In-state students
93% Out-of-state students
22% Women
78% Men
1% American Indian or Alaska Native
7% Asian
9% Black or African American
10% Hispanic/Latino
2% Native Hawaiian/Pacific Islander
67% White
1% Non-Resident Alien
55% in top 10th of graduating class
80% in top quarter of graduating class
97% in top half of graduating class
79% had h.s. GPA of 3.75 and higher
12% had h.s. GPA between 3.5 and 3.74
8% had h.s. GPA between 3.25 and 3.49
1% had h.s. GPA between 3.0 and 3.24
Male/Female percentages this is where the service academies are very different from typical state universities. USAFA 22%, USNA 19%, USMA 16%
Political Affliation This is not reported however the academies skew to the right. They definitely could use more liberals to mix things up a bit.
Religious Affiliation I know this is available but I couldn't find it.
Hope this helps!