New York Times Wall Street Journal Washington Post Christian Science Monitor TEXAS Austin American-Statesman Houston Chronicle Dallas Morning News San Antonio Express News El Paso Times The Texas Monthly CALIFORNIA Los Angeles Times San Francisco Chronicle San Jose Mercury News San Diego Union Tribune OTHER USA REGIONAL Chicago Tribune Boston Globe Denver Post Miami Herald Seattle Times

P.S. Huge list of newspapers (can't vouch for how current it is) at The Op Ed Project, which also offers tips on structure and how to pitch. More tips from The New York Times and Writer's Digest.