MarathonGuide.com, an excellent source for race information and runner reviews, lists 384 domestic marathons. All 50 states host at least one.

Here is but a sampling, more than 50 from sea to shining sea, plus Alaska, Hawaii and Canada. Peruse this and go to MarathonGuide.com for more info -- including their incredibly helpful race calendars -- to help find the right combo of race and destination for you.

THE CLASSICS
ING New York City Marathon (November)
New York, NY
http://www.ingnycmarathon.org/

The course starts in Staten Island, traverses all five boroughs, crosses five bridges and finishes with a flourish at Central Park's Tavern on the Green. An entire city turning out to cheer you provides a good distraction from a course that can be deceptively difficult in places. The roar of the crowd waiting ten deep to greet runners as they exit the 59th Street Bridge from Queens and enter Manhattan for the first time ranks right up there with the all-time mass-marathon rushes. Essentially the Super Bowl of marathons, the large international field gives the pre- and post-race festivities a World Cup flavor.