What is the most abundant cockroach species in the United States?

• A. Oriental
• B. German
• C. American
• D. Brownbanded

Answer: (B)

The main idea here is that one cockroach species dominates as a household pest across the United States. The German cockroach is the most abundant in homes and buildings because of its biology and habits: it’s small and highly adaptable to indoor environments, reproduces quickly, and can survive in tight, warm spaces with food and moisture—like kitchens and bathrooms. Its life cycle allows multiple generations to thrive in a single year, so outnumbering other species becomes very common in indoor settings and multi-unit buildings.

This combination of traits makes the German cockroach the species you’re most likely to encounter in American households. In contrast, Oriental cockroaches are larger and prefer damp outdoor areas or basements rather than interiors; American cockroaches are also larger and more often associated with outdoor habitats, sewers, or expansive spaces; brownbanded cockroaches can infest indoors but are not as widespread nationwide.