Don’t count airline plane changes, unless you actually left eh airport.
You can count driving through…
(you can count DC)
Me…25
Virginia
West Virginia
Maine
New Hampshire
Massachussettes
Rhode Island
Delaware
Maryland
Tennessee
Kentucky
North Carolina
South Carolina
Georgia
Florida
Indiana
Illinois
Missouri
Kansas
Colorodo
Ohio
Pennsylvania
New York
New Jersey
Connecticut
DC
Nevada
Georgia
New York
Illinois
Arkansas
Oklahoma
Colorado
Louisiana
Tennessee
California
Michigan
That’s only eleven; I guess I should get out more. What’s worse, eight involved business trips…
Not so many:
Louisiana
Mississippi
Florida
Texas
Alabama
Georgia
Illinois
35
Arizona
Arkansas
California
Colorado
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Kentucky
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nevada
New Jersey
New Mexico
New York
North Carolina
Ohio
Oregon
Pennsylvania
South Carolina
South Dakota
Tennessee
Texas
Virginia
Washington
West Virginia
Wisconsin
Wyoming
plus Puerto Rico and the District of Colombia
49
Still missing Alaska
As a little kid I was taken to some states I haven’t revisited since: Texas and Oklahoma.
As a somewhat older kid I was taken to some I remember visiting, but little about them: Wisconsin, Illinois, Iowa, Nebraska, Kansas, Missouri.
As an adult I have seen and remember seeing: Florida, Georgia, Alabama, Mississippi, Louisiana, Arkansas, Tennessee, North Carolina, South Carolina, Virginia, Kentucky, Indiana, Ohio, Pennsylvania, New York, New Jersey, Connecticut, Vermont, New Hampshire, Massachusetts, Maine, Maryland, West Virginia.
This far, I have yet to visit Michigan, Rhode Island and Delaware in the Eastern USA, and any of the Western USA west of Texas and Kansas.
I count 31. You can add Ontario if you like.
I have been to 48 states plus DC, which really doesn’t count since I live 20 miles from there. All 48 have been done by motorcycle, 47 in the last two years alone. I plan on hitting Alaska by bike in the next couple of years, and Hawaii at some point, just don’t know when.
Alabama
Florida
Georgia
Louisiana
Mississippi
Illinois
Indiana
Ohio
Maryland
New Jersey
New York
Pennsylvania
West Virginia
Kentucky
Tennessee
Virginia
Connecticut
Maine
Massachusetts
New Hampshire
Rhode Island
Vermont
California
Hawaii
Arkansas
Missouri
Oklahoma
Texas
That is 28. I am missing most of the Great Plains and the West.
California
Nevada
I’m from UK though so I’ll list all the countries I been to as well:
Scotland
England
Wales
France
Belgium
Holand
Germany
Austria
Spain
Mexico
Canadian girl here…I’ve been to 15 States;
New York
Pennsylvania
West Virginia
Virginia
North & South Carolina
Georgia
Kentucky
Florida
Ohio
Tennesee
Michigan
Indiana
Illinois
Mississippi
Canada - 5
Ontario
Quebec
PEI
Nova Scotia
New Brunswick
Favorite State…Florida, favorite city…Savannah, Georgia.
Alabama
Arizona
Arkansas
California
Colorado
Florida
Georgia
Idaho
Illinois
Kentucky
Louisiana
Mississippi
Missouri
Nevada
New Mexico
New York
North Carolina
Ohio
Oklahoma
Pennsylvania
Tennessee
Texas
Utah
Wisconsin
C’mon up! 
I already did a thread on this, so won’t list them all again.
31 total, but most were due to my short lived career as a truck driver that required me to drive from Washington or California along I-80 to Michigan or Indiana and back every week or so.
Living in Washington it’s almost impossible not to enter Idaho, Montana and Oregon at some point.
New York
Pennsylvania
New Jersey
Delaware (Mom made a wrong turn when we were going to NJ)
Maryland
DC
Ohio
Indiana
Illinois
Missouri
Kansas
Kentucky
West Virginia
Virginia
North Carolina
South Carolina
Tennessee
Arkansas
Louisana
Mississippi
Alabama
Georgia
Florida
California
I went outside of the airport in Michigan, but only to smoke. I don’t think that one counts
9 states for me:
Idaho- I live here, so that’s a given.
Oregon- been there dozens of times for various reasons
Washington- Been to Seattle four times, first time was in 1993.
California- I’ve only been there once, back in 1984, and it was only the northern extremity when we went to see the redwood trees.
Nevada- I can barely count this one, too. I’ve only been as far as Jackpot, which is primarily a gambling town right across the Idaho-Nevada line. I’ve been there a couple dozen times or so.
Montana- Visited Helena and Missoula with a friend, 1985.
Kansas- Made several trips to visit a friend who lived there before I helped him move back here this summer.
Colorado- Drove through it along I-70 and up I-25 during aforementioned move.
Wyoming- Drove through it on I-80 for said moving trip, stayed in Green River overnight.
I’ve also been in Utah and Texas, but they don’t count since the OP specified to not include airport layover stops.
Just 12, so far:
Ohio
Pennsylvania
Indiana
Illinois
North Carolina
Maryland
Virginia
West Virginia
Michigan
Flordia
DC
New York
24 + DC
Maine
New Hampshire
Vermont
Connecticut
Massachusetts
Rhode Island
New York
New Jersey
Pennsylvania
Delaware
Maryland
Virginia
West Virginia
North Carolina
South Carolina
Georgia
Florida
Kentucky
Tennessee
Michigan
Oklahoma
Kansas
Colorado
California
32 of em. Would like to see the rest. Need to hit New England, Dakotas, Alaska, Mid-Atlantic and Deep South. Only made Michigan barely. Far western tip of the Upper Peninsula, more like Wisconsin, really.
I actually don’t travel much. I hit many of these on two big trips.
I always drive damn fast, and am pretty please with myself when I don’t get speeding tickets. I sing a funny little song as I’m driving and a leave a state for the last time. It goes like this:
“Ha Ha Ha!
Ha Ha (insert state name here)
You didn’t catch me!
Ha Ha Ha!”
Oh, how the miles just seem to fly by!
She told me she loved me like a brother. She was from Arkansas, hence the Joy!
So driving through counts? Let’s see:
Alaska
California
Connecticut
Delaware
Florida
Georgia
Illinois
Indiana
Maryland
Massachussetts
Minnesota (I think … it was a childhood family vacation and the memories are fuzzy)
New Hampshire
New Jersey
New York
North Carolina
Ohio
Pennsylvania
Rhode Island
South Carolina
Vermont
Virginia
Washington
West Virginia
Wisconsin
So, 24, but five of them are in the “driving through” category.
I’ve been to every state east of the Mississippi River (plus a handful of others):
Maine
New Hampshire
Vermont
Connecticut
Rhode Island
Massachusetts
Delaware
New Jersey
New York
Pennsylvania
Maryland
Virginia
North Carolina
South Carolina
Ohio
Georgia
Florida
Alabama
Mississippi
Tennessee
Kentucky
Indiana
Illinois
Wisconsin
Michigan
Missouri
Arkansas
Louisiana
Texas
California
Arizona
Nevada
Washington
Plus D.C., Puerto Rico, and the U.S. Virgin Islands. Vermont, Maine, and Kentucky are the only ones I merely drove through.
33 + 3
–Cliffy