Government establishments primarily engaged in regulation, licensing and inspection of communications, electric (including nuclear), gas, water, sewer, and other utilities. Operators of utilities are classified in Transportation and Public Utilities, Division E. All establishments of the U.S. Postal Service are classified in Transportation and Public Utilities, Industry 4311.
- Communications commissions-government
- Irrigation districts-nonoperating
- Licensing and inspection of utilities
- Mosquito eradication districts
- Nuclear energy inspection and regulation offices
- Public service commissions, except transportation
- Public utility commissions
- Regulation of utilities
- Sanitary districts-nonoperating