Castle Rock sits in the gap on I-25 between the Denver and Colorado Springs metros, which gives it a genuinely different position than a typical south-metro suburb. It draws some commercial activity from both directions along the corridor without being fully absorbed into either metro's core, and that in-between position shapes how residents and businesses here actually search and travel for services.
The town has grown quickly as a residential base for people commuting toward the Denver metro, and its retail and service economy has grown alongside that, but Castle Rock retains a distinct identity built around Douglas County's suburban and semi-rural character rather than functioning as an extension of Denver proper.
Castle Rock's position between the two metros means some searches pull in results and competitors from both the Denver and Colorado Springs directions, particularly for services people are willing to drive for. Local, proximity-based search still favors businesses physically located in town over those simply passing through the corridor.