Encyclopedia Americana: James Polk: A detailed biography written for students. Includes Polk's inaugural addresses and a fact file.
James K. Polk: Short biography from the official White House web site.
James K. Polk: Brief biography and portrait.
New Book of Knowledge: James Polk: An encyclopedic biography written for 3-8 grade students. Includes fact file and first inaugural address.
POTUS -- James Knox Polk: Includes portrait, a short list of biographical facts, and related links.
The American President: James Polk: Fact file and comprehensive biographical sketch based on PBS series.