Accompanying an article on the variations of the wealthiest one percent, The New York Times provides this interactive map to see what percent you're in. Simply enter your household income and see how you compare in metropolitan areas with over 50,000 households.
Nation-wide, a household income over $383,000 puts you in the top one percent. However, a lower household income of $179,000 puts you in the top one percent in Flint, Michigan. The same wage in San Diego, California puts you only in the top eight percent.
Update: There was also a fine print version.