The following highways are numbered 204:

Canada

• Manitoba Provincial Road 204
• Newfoundland and Labrador Route 204
• Nova Scotia Route 204
• Prince Edward Island Route 204
• Quebec Route 204

China

• China National Highway 204

Costa Rica

• National Route 204

Japan

• Japan National Route 204

United States

• Alabama State Route 204
• Arkansas Highway 204 (former)
• California State Route 204
• Florida State Road 204 (former)
• Georgia State Route 204
• Iowa Highway 204 (former)
• K-204 (Kansas highway)
• Maine State Route 204
• Massachusetts Route 204 (former)
• M-204 (Michigan highway)
• Montana Secondary Highway 204
• New Mexico State Road 204
• New York State Route 204
• Ohio State Route 204
• Oregon Route 204
• Pennsylvania Route 204
• South Dakota Highway 204
• Tennessee State Route 204
• Texas State Highway 204
  • Texas State Highway Loop 204
• Utah State Route 204
• Virginia State Route 204
• Washington State Route 204

Territories

• Puerto Rico Highway 204