Which of these cockroach types is notably found indoors?

The German cockroach is primarily associated with indoor environments due to its preference for warm, humid places that provide food and shelter. This species thrives in residential settings, commonly being found in kitchens and bathrooms where food debris and moisture are plentiful. Its ability to reproduce quickly makes it a frequent concern in indoor pest control scenarios.

While the Oriental and American cockroaches can also be found in buildings, they are more often encountered in outdoor settings or as occasional intruders rather than as permanent indoor residents. The Oriental cockroach prefers damp areas such as basements, while the American cockroach is more commonly found in warm, dark locations but tends to be more prevalent outdoors or in commercial settings.

Thus, while there are several cockroach types that can be found indoors, the German cockroach is particularly notorious for being a common nuisance within residential properties.