Chicago new york irvine london

It looks like you've listed four cities:

1. Chicago
2. New York
3. Irvine
4. London

These cities are all located in different parts of the world:

• Chicago is located in the Midwestern United States
• New York is located in the Northeastern United States
• Irvine is located in Southern California, United States
• London is located in the United Kingdom, Europe

Is there something specific you'd like to know about these cities, or are you just listing them for some reason?