here in Michigan pretty much all yard/security lights are HID. theres one on my property and 2 at my Grandparents' place. almost every place here in rural areas has at least one, maybe 2 or even more. most are MV. there are some HPS and a few MH. LED is becoming more prominent. usually the lower wattage ones on garages and such. they aren't near as bright as a HID one though and I feel that people are going to find that they don't last near as long as the package says they will.
My neighbor hood has people who use MV yardblasters
the light on my property is a 175w MV NEMA head and the ones at my grandparents are a 175w MV yardblaster and a 35w HPS wallpack. yup theyre pretty common here