Public Policy Research Think Tanks 2018: Top Think Tanks - US

• D.C. - 397
• Massachusetts - 177
• California - 169
• New York - 144
• Virginia - 105
• Illinois - 62
• Maryland - 50
• Texas - 47
• Connecticut - 44
• Pennsylvania - 42
• New Jersey - 36
• Colorado - 31
• Florida - 31
• Michigan - 31
• Georgia - 29
• Ohio - 25
• Minnesota - 23
• North Carolina - 23
• Washington - 23
• Wisconsin - 22
• Arizona - 21
• Indiana - 21
• Maine - 21
• Rhode Island - 20
• Tennessee - 19
• Missouri - 18
• Alabama - 16
• Kansas - 17
• Oregon - 16
• New Hampshire - 13
• Hawaii - 12
• Kentucky - 11
• Oklahoma - 11
• Iowa - 10
• Louisiana - 10
• Mississippi - 10 
• Arkansas - 8
• Montana - 8
• Nebraska - 7
• New Mexico - 7
• Utah - 7
• South Carolina - 6
• West Virginia - 6
• South Dakota - 5
• Vermont - 5
• Idaho - 4
• Nevada - 4
• North Dakota - 4
• Alaska - 3
• Delaware - 3

Total - 1835

List found on page 30-31