IBEW Local 278 covers the following counties in Texas:

• Aransas County, TX
  
• Bee County, TX
  
• Brooks County, TX
  
• Calhoun County, TX
  
• Duval County, TX
  
• Goliad County, TX
  
• Jim Hogg County, TX
  
• Jim Wells County, TX
  
• Kenedy County, TX
  
• Kleberg County, TX
  
• Live Oak County, TX
  
• Nueces County, TX
  
• Refugio County, TX
  
• San Patricio County, TX
  
• Victoria County, TX