Greg Sirb, Director of the Pennsylvania State Athletic Commission, compiled a list of how many MMA and boxing shows were regulated by each commission in the USA. California did a massive 118 professional boxing events in 2018, and 120 MMA shows. That’s more than Nevada, Texas, New York, and New Jersey combined!

The first number is boxing, second number of MMA, and the third number is combined. The list is first presented alphabetically, an then ordered by event number.

Ordered alphabetically:
Alabama 3 3 = 6
Arizona 9 18 = 27
Arkansas 5 10 =15
Association of Boxing Comm 1 0 = 1
California 118 120* = 238
Citiz Potawatomi 2 10 = 12
Colorado 18 21 = 39
Connecticut 1 0 = 1
D.C-Wash 3 2 = 5
Florida 33 51 = 84
Georgia 12 15 = 27
Hawaii 0 9 = 9
Idaho 3 8 = 11
Illinois 8 25 = 33
Indiana 17 11 = 28
Iowa 5 31 = 36
Kansas 10 16 = 26
Kentucky 11 19 = 30
Louisiana 5 24 = 29
Maine 2 5 = 7
Maryland 7 5 = 12
Mashantucket Pequot 4 0 = 4
Massachusetts 10 11 = 21
Michigan 9 24 = 33
Mille Lac Band of Ojibwe 2 2 = 4
Minnesota 3 12 = 15
Mississippi 12 1 = 13
Missouri 8 36* = 44
Mohegan Tribe 2 11 = 13
Montana 0 0* = 0
Nebraska 4 17 = 21
Nevada 21 49 = 70
New Hampshire 7 3 = 10
New Jersey 11 22 = 33
New Mexico 7 8 = 15
New York 28 50* = 78
North Carolina 18 16 = 34
North Dakota 2 2 = 4
Ohio 10 24 = 34
Oklahoma 9 19 = 28
Oneida Indian Nation 3 0 = 3
Oregon 3 17 = 20
Pascua Yaqui 2 1 = 3
Pennsylvania 37 25 = 62
Pueblo of Pojoaque 3 2 = 5
Rhode Island 4 5 = 9
Seneca Nation 0 3 = 3
South Carolina 3 10 = 13
South Dakota 1 8 = 9
Tennessee 8 27 = 35
Texas 54 69 = 123
Utah-Pete Suazo 5 17 = 22
Virginia 9 26 = 25
Washington 6 16* = 24
West Virginia 16 7 = 23
Wisconsin 5 20 = 25
Wyoming 2 5 = 7

Ordered by number:
California 118 120* = 238
Texas 54 69 = 123
Florida 33 51 = 84
New York 28 50* = 78
Nevada 21 49 = 70
Pennsylvania 37 25 = 62
Missouri 8 36* = 44
Colorado 18 21 = 39
Iowa 5 31 = 36
Tennessee 8 27 = 35
North Carolina 18 16 = 34
Ohio 10 24 = 34
Illinois 8 25 = 33
Michigan 9 24 = 33
New Jersey 11 22 = 33
Kentucky 11 19 = 30
Louisiana 5 24 = 29
Indiana 17 11 = 28
Oklahoma 9 19 = 28
Arizona 9 18 = 27
Georgia 12 15 = 27
Kansas 10 16 = 26
Virginia 9 26 = 25
Wisconsin 5 20 = 25
Washington 6 16* = 24
West Virginia 16 7 = 23
Utah-Pete Suazo 5 17 = 22
Massachusetts 10 11 = 21
Nebraska 4 17 = 21
Oregon 3 17 = 20
Arkansas 5 10 = 15
Minnesota 3 12 = 15
New Mexico 7 8 = 15
Mississippi 12 1 = 13
Mohegan Tribe 2 11 = 13
South Carolina 3 10 = 13
Citizen Potawatomi 2 10 = 12
Maryland 7 5 = 12
Idaho 3 8 = 11
New Hampshire 7 3 = 10
Hawaii 0 9 = 9
Rhode Island 4 5 = 9
South Dakota 1 8 = 9
Maine 2 5 = 7
Wyoming 2 5 = 7
Alabama 3 3 = 6
D.C-Wash 3 2 = 5
Pueblo of Pojoaque 3 2 = 5
Mashantucket Pequot 4 0 = 4
Mille Lac Band of Ojibwe 2 2 = 4
North Dakota 2 2 = 4
Oneida Indian Nation 3 0 = 3
Pascua Yaqui 2 1 = 3
Seneca Nation 0 3 = 3
Association of Boxing Comm 1 0 = 1
Connecticut 1 0 = 1
Montana 0 0* = 0

In total there were 601 boxing events, and 739 for MMA.

In addition, there were Non-Sanctioned MMA bouts in six states. These could be on tribal land without a commission, or were amateur events, in states were amateurs are not regulated.
California 21
Missouri 41, However, Missouri began regulating amateurs as of September 2018
Mississippi 3
Montana 7
New York 3
Washington 5