Hi again, and thanks for requesting me!
The US national average is 84 pregnancies per 1000 teens.
The Mississippi average is 103 pregnancies per 1000 teens. That ranks 3rd highest out of the 50 states.
The US teen birth rate average (taking into account abortions, miscarriages, etc.) is 48 per 1000 teens.
The Mississippi average is 71 births per 1000 teens, which is the highest in the country.
Nicely formatted data: http://www.teenpregnancy.org/america/statisticsDisplay.asp?ID=3&sID=18&sort=rank
Original source (page 12): http://www.guttmacher.org/pubs/2006/09/12/USTPstats.pdf
I hope this helps,