This is to tell you what state his/her call-sign was issued (Sometimes). This somtimes work to tell you what state a Ham is from or in certain area. Like take for example W1AW it was issued in Connecticut.
North Dakota, South Dakota, Nebraska, Colorado, Kansas, Missouri, Iowa, and Minnesota.
Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut.
New York, and New Jersey.
Pennsylvania, Delaware, and Maryland.
Virginia, Kentucky, North Carolina, South Carolina, Tennessee, Georgia, Alabama, and Florida.
New Mexico, Texas, Oklahoma, Arkansas, Louisiana, and Mississippi.
California, and Hawaii.
Arizona, Utah, Nevada, Wyoming, Idaho, Oregon, Montana, Washington, and Alaska.
Michigan, Ohio, and West Virginia.
Indiana, Illinois, and Wisconsin.