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American Cockroach

Identification, Habits, and Control
Closeup photo of a American Cockroach

About American Cockroaches

Species: Periplaneta americana

American cockroaches are one of the largest and most recognizable cockroach species found in the United States. They are commonly associated with warm, humid environments such as basements, crawl spaces, drains, and commercial buildings.

While they typically live in lower levels or outdoor environments, they can move into living or working spaces in search of food and moisture—especially during extreme weather or when conditions change.

How to Identify American Cockroaches

Size

  • 1.5 to 2 inches long
  • One of the largest common cockroach species

Color

  • Reddish-brown
  • Yellowish figure-eight pattern behind the head

Identifying Characteristics

  • Large size with fully developed wings
  • Capable of short gliding movements
  • Oval-shaped body
  • Fast-moving when disturbed

Where You’ll Find Them

  • Basements and crawl spaces
  • Sewer systems and drains
  • Commercial kitchens and storage areas
  • Around moisture sources and warm environments
  • Outdoor areas like mulch, landscaping, and foundations

Behavior and Risks

American cockroaches prefer warm, damp environments and are closely associated with moisture and organic material.  They are often found in sewer systems and can travel through pipes and drains, allowing them to move between different areas of a structure.

They are primarily nocturnal and tend to hide during the day in dark, protected spaces. Seeing them during the day may indicate a larger population or that hiding areas are overcrowded. Common signs include spotting large cockroaches in basements or near drains, finding droppings, or noticing activity after dark in kitchens or utility areas.

While they do not reproduce as quickly as smaller species like German cockroaches, they can still establish persistent infestations. They can contaminate surfaces and food and may carry bacteria from unsanitary environments into living spaces. Because they often originate from outside or sewer systems, effective control requires addressing both entry points and moisture conditions in addition to targeted treatment.