Where in USA are black widow spiders typically found?

Everywhere. Red States, Blue States, Dry Counties, and even Detroit. The specific species you mention (L. mactans) is also known as the Southern Black Widow. read more

The specific species you mention (L. mactans) is also known as the Southern Black Widow. Y'all can identify it by it's regional accent (or the typical red-on-black markings). It lives in the Southern United States from Florida and as far west as Nevada. read more

The female black widow spider is considered the most venomous spider in North America. The venom of the black widow spider is 15 times as toxic as the venom of the prairie rattlesnake. Only the female black widow is dangerous to humans; males and juveniles are harmless. The female black widow will, on occasion, kill and eat the male after mating. read more

Black widow spiders favor dark, secluded areas such as crevices and woodpiles. Inside the home, black widows typically hide in sheltered, dimly lit locations such as garages, dark corners, basements, closets and cluttered areas. read more