There are serial killers from all over, but a lot are from the United States.
Murderpedia, Investigation Discovery
That's Nannie Doss, a serial killer from Alabama, and Theresa Knorr, from California.
Like Dean Corll, aka "The Candy Man," who tortured and murdered at least 29 men in Houston in the early '70s.
Murderpedia
Or Danny Rolling, "the Gainesville Ripper," who killed eight people in Florida and then would pose his victims' dead bodies for police to find.
Wikipedia Commons / Public Domain
And Amy Archer-Gilligan, who ran a home for the elderly in Connecticut, where she poisoned over two dozen people in the '60s.
Wikipedia Commons / Public Domain