U.S. States: Arizona, California, Colorado, Connecticut, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, Tennessee, Texas, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming
other U.S.: District of Columbia, U.S. Government
Canada: Manitoba, Ontario, Quebec
Not seen since May 2009: Delaware, Hawaii, Kentucky, Missouri, Nevada, Utah
Not seen since April 2009: Idaho, New Mexico
Not seen since March 2009: Alabama, Alaska, Montana, South Carolina, British Columbia
Not seen since Feb 2009: Arkansas, Louisiana
Not seen since Jan 2009: Nebraska, North Dakota
Not seen since Oct 2008: South Dakota
Not seen since Aug 2008: Nova Scotia
Not seen since Dec 2007: New Brunswick, Puerto Rico
I have to make mention that Wyoming enters the list after more than a year. I hadn't seen one of them since May 2008.
I'm curious, what state do you see the most, besides NY?
It's hard to go out for a quick drive anywhere around my neighborhood without seeing at least a few of PA, NJ, MI, OH, CT. If I drive through the university side streets I'll probably see all of those plus a few more among VT, ME, VA, FL, CA, TX, MN, MO, IL, IN. But if I had to guess at the most common besides NY, it would probably be PA.