| Referee | Games |  |  | Cards per game |
|---|
| Rodrigo Albuquerque | 2 | 11 | 1 | 6.0 (5.5 / 0.5) | |
| Elijio Arreguin | 15 | 61 | 2 | 4.2 (4.1 / 0.1) | |
| Malik Badawi | 15 | 73 | 1 | 5.0 (4.9 / 0.1) | |
| Fotis Bazakos | 19 | 89 | 2 | 4.8 (4.7 / 0.1) | |
| Nabil Bensalah | 6 | 19 | 1 | 3.4 (3.2 / 0.2) | |
| Serhiy Boiko | 17 | 63 | 2 | 3.8 (3.7 / 0.1) | |
| Allen Chapman | 23 | 71 | 4 | 3.3 (3.1 / 0.2) | |
| Matthew Corrigan | 1 | 5 | 0 | 5.0 (5.0 / 0.0) | |
| Alexis Da Silva | 20 | 97 | 4 | 5.0 (4.8 / 0.2) | |
| Marcos de Oliveira | 11 | 33 | 0 | 3.0 (3.0 / 0.0) | |
| Sergii Demianchuk | 16 | 58 | 0 | 3.6 (3.6 / 0.0) | |
| Marcos DeOliveira II | 3 | 11 | 0 | 3.7 (3.7 / 0.0) | |
| Joe Dickerson | 17 | 75 | 5 | 4.7 (4.4 / 0.3) | |
| Filip Dujic | 20 | 73 | 4 | 3.9 (3.7 / 0.2) | |
| Ismail Elfath | 17 | 69 | 4 | 4.3 (4.1 / 0.2) | |
| Joshua Encarnación | 4 | 17 | 1 | 4.6 (4.3 / 0.3) | |
| Ricardo Fierro | 13 | 55 | 4 | 4.5 (4.2 / 0.3) | |
| Drew Fischer | 21 | 91 | 4 | 4.5 (4.3 / 0.2) | |
| Timothy Ford | 15 | 56 | 3 | 3.9 (3.7 / 0.2) | |
| Jon Freemon | 22 | 94 | 4 | 4.5 (4.3 / 0.2) | |
| Guido Gonzales Jr. | 10 | 50 | 4 | 5.4 (5.0 / 0.4) | |
| Guido Gonzales Jr. | 4 | 17 | 2 | 4.8 (4.3 / 0.5) | |
| Jorge Gonzalez | 1 | 3 | 0 | 3.0 (3.0 / 0.0) | |
| Lorenzo Hernandez | 17 | 57 | 2 | 3.5 (3.4 / 0.1) | |
| Muhammad Kaleia | 1 | 5 | 0 | 5.0 (5.0 / 0.0) | |
| Ekaterina Koroleva | 1 | 7 | 0 | 7.0 (7.0 / 0.0) | |
| Pierre-Luc Lauziere | 20 | 66 | 0 | 3.3 (3.3 / 0.0) | |
| Jair Marrufo | 14 | 26 | 1 | 2.0 (1.9 / 0.1) | |
| Rosendo Mendoza | 20 | 81 | 3 | 4.3 (4.1 / 0.2) | |
| Ricardo Montero | 13 | 57 | 5 | 4.8 (4.4 / 0.4) | |
| Abdou Ndiaye | 1 | 4 | 0 | 4.0 (4.0 / 0.0) | |
| Tori Penso | 17 | 66 | 1 | 4.0 (3.9 / 0.1) | |
| Chris Penso | 17 | 90 | 3 | 5.5 (5.3 / 0.2) | |
| Victor Rivas | 22 | 110 | 8 | 5.4 (5.0 / 0.4) | |
| Brandon Stevis | 3 | 9 | 1 | 3.3 (3.0 / 0.3) | |
| Lukasz Szpala | 4 | 10 | 1 | 2.8 (2.5 / 0.3) | |
| Ramy Touchan | 12 | 58 | 4 | 5.1 (4.8 / 0.3) | |
| Rubiel Vazquez | 22 | 80 | 5 | 3.8 (3.6 / 0.2) | |
| Michael Venne | 2 | 11 | 0 | 5.5 (5.5 / 0.0) | |
| Armando Villareal | 17 | 70 | 0 | 4.1 (4.1 / 0.0) | |
