1. Singapore: Singapore is known for its highly advanced and comprehensive smart city initiatives. It focuses on sustainable urban development, with projects such as smart buildings, energy-efficient infrastructure, and advanced waste management systems.

2. South Korea: South Korea’s capital, Seoul, is often considered a leading smart city. It has implemented projects such as intelligent transportation systems, smart grids, and digital governance platforms to promote sustainable development.

3. United Arab Emirates: The UAE has invested heavily in smart city initiatives, particularly in cities like Dubai and Abu Dhabi. Their projects include smart transportation systems, renewable energy integration, and advanced infrastructure management systems.

4. China: Chinese cities like Shanghai, Shenzhen, and Hangzhou are at the forefront of implementing smart city initiatives. They focus on areas such as smart transportation, energy management, and intelligent infrastructure development for sustainable urban growth.

5. Denmark: Denmark, particularly the city of Copenhagen, is known for its smart city initiatives. It emphasizes renewable energy integration, smart mobility solutions, and data-driven urban planning for sustainable urban development.

6. United States: Cities like New York City, San Francisco, and Seattle in the United States have implemented various smart city initiatives. They include smart grids, integrated transportation systems, and efficient waste management strategies.

7. Finland: Finland has been actively implementing smart city initiatives, particularly in cities like Helsinki. It focuses on intelligent transportation, energy-efficient buildings, and digital services for sustainable urban development.

8. Japan: Japanese cities like Tokyo and Yokohama have made significant strides in smart city implementation. They emphasize initiatives such as smart transportation networks, eco-friendly infrastructure, and disaster management systems.

9. Netherlands: The Netherlands, particularly cities like Amsterdam and Rotterdam, have embraced smart city initiatives for sustainable urban development. Their projects include smart mobility solutions, renewable energy integration, and innovative waste management systems.

10. Sweden: Swedish cities like Stockholm and Gothenburg are known for their smart city initiatives. They focus on areas such as smart grids, connected transportation, and energy-efficient buildings for sustainable urban development.