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 Writer's Digest.