SOUTH PLAINFIELD, NJ–Week four of the 2021 Union County High School Football season saw some more upheaval as Linden knocked off Westfield (20-14) to improve to 3-0 and Elizabeth fall to Union (34-0) while New Providence defeated Bound Brook (40-8) and Brearley downed Middlesex (36-13). Current record in parenthesis.
- Union (3-1)
- Cranford (3-0)
- Scotch Plains-Fanwood (3-2)
- Summit (3-1)
- Hillside (2-1)
- Linden (3-0)
- New Providence (2-1)
- Brearley (3-0)
- Elizabeth (2-2)
- Westfield (2-1)
Other teams considered: Rahway (1-3), Plainfield (1-3), Jonathan Dayton (2-1), Governor Livingston (0-3), Roselle Park (1-1), and A.L. Johnson (1-3).
