SourceWatch Congresspedia - Maria Cantwell
- Encyclopedia article focused on his political career along with background data and links to additional articles and resources.
- http://www.sourcewatch.org/index.php?title=Maria_Cantwell

Biographical Directory of the United States Congress - Maria E. Cantwell
- Short biography along with political party, years of service in Congress and bibliography.
- http://bioguide.congress.gov/scripts/biodisplay.pl?index=c000127

FEC - Candidate Summary Reports: Maria Cantwell
- Official campaign finance reports and data from the Federal Election Commission.
- http://herndon1.sdrdc.com/cgi-bin/can_detail/S8WA00194

Maria Cantwell News - The New York Times
- Ongoing collection of news articles, commentary, photos and multimedia about the U.S. Senator for Washington.
- http://topics.nytimes.com/top/reference/timestopics/people/c/maria_cantwell/index.html

Wikipedia - Maria Cantwell
- Hyperlinked encyclopedia article provides a personal and political profile of the US Senator for Washington.
- http://en.wikipedia.org/wiki/Maria_Cantwell

OpenSecrets.org - Maria Cantwell
- Career profile of campaign funds raised and spent.
- http://www.opensecrets.org/politicians/allsummary.asp?CID=N00007836

Washington Post - The US Congress Votes Database: Maria Cantwell
- Features complete voting record along with a brief biography, roles in Congress and financial disclosure statement.
- http://projects.washingtonpost.com/congress/members/c000127/

Project Vote Smart - Senator Maria Cantwell (WA)
- Provides a biography, committee assignments, campaign finances, voting record, issue positions, interest group ratings, speeches and public statements.
- http://www.vote-smart.org/bio.php?can_id=H4152103

On the Issues - Washington Senator Maria Cantwell
- Provides quotes and background on various international, domestic, economic and social issues. Includes profile, contact data, forum and SenateMatch.
- http://www.ontheissues.org/Senate/Maria_Cantwell.htm