McCaul, whose wife's father was the founder of Clear Channel Communications, has been a regular at the top of the yearly list. He is joined in the top 50 by fellow Texas Congressmen Roger Williams, R-Austin, Kenny Marchant, R-Coppell, and Lloyd Doggett, D-Austin.
On the other side, U.S. Rep. Rubén Hinojosa, D-Edinburg, was named one of Congress' poorest members.
Each year, Roll Call's reporters scour each member's financial disclosure forms to determine the "Wealth of Congress."
Here's a look at what it found for the Texans on the richest and poorest lists. For more on Roll Call's Wealth of Congress list, read the paper's full article.
#33 U.S. Rep. Lloyd Doggett, D-Austin
Net Worth: $13 million
How he got there: Doggett's wealth is tied up in Travis County rental properties, retirement income from his Texas Legislature tenure and assets wrapped up in stocks and mutual funds.
#536 U.S. Rep. Ruben Hinojosa, D-Edinburg
Net Worth: -$900,000
How he got there: Roll Call writes that "a massive arbitration award exceeding $1 million against Hinojosa from a failed food business — along with tens of thousands of dollars of unpaid tax bills for that business" put Hinojosa as the sixth-poorest member.