Here are the most common specialties by state and in the District and Columbia, according to recent data from KFF:
Alabama: Surgery
Alaska: Emergency medicine
Arizona: Emergency medicine
Arkansas: Emergency medicine
California: Psychiatry
Colorado: Emergency medicine
Connecticut: Psychiatry
Delaware: Emergency medicine
District of Columbia: Psychiatry
Florida: Emergency medicine
Georgia: Emergency medicine
Hawaii: Psychiatry
Idaho: Radiology
Illinois: Emergency medicine
Indiana: Anesthesiology
Iowa: Surgery
Kansas: Surgery
Kentucky: Surgery
Louisiana: Emergency medicine
Maine: Emergency medicine
Maryland: Psychiatry
Massachusetts: Psychiatry
Michigan: Emergency medicine
Minnesota: Surgery
Mississippi: Emergency medicine
Missouri: Emergency medicine
Montana: Anesthesiology
Nebraska: Surgery
Nevada: Emergency medicine
New Hampshire: Psychiatry
New Jersey: Emergency medicine
New Mexico: Emergency medicine
New York: Psychiatry
North Carolina: Emergency medicine
North Dakota: Surgery
Ohio: Emergency medicine
Oklahoma: Emergency medicine
Oregon: Emergency medicine
Pennsylvania: Emergency medicine
Rhode Island: Emergency medicine
South Carolina: Emergency medicine
South Dakota: Psychiatry
Tennessee: Surgery
Texas: Anesthesiology
Utah: Anesthesiology
Vermont: Psychiatry
Virginia: Emergency medicine
Washington: Anesthesiology
West Virginia: Emergency medicine
Wisconsin: Radiology
Wyoming: Emergency medicine