Brookline Lane, part of the Springwells Park subdivision.
Cosmo, Hershey & Smokey live in the yellow house, front and center. CatBeard is in the playground, of course, and Winter's house is mostly obscured by the tree. Dumptruck the bulldog lives on the off-screen house on your right. In the distance you can see McEatie's and the strip mall that includes the 10-4 Convenience store where CosmiCat was once filmed savagely attacking someone (the news failed to mention the guy was trying to rob a McEatie's employee who was on her way home from work).