These are fascinating. Thanks for sharing them. As for the clothing and hair styles, I'd say they were taken from the late 30s to the 70s. Black and white can show lots more character then color, for whatever reason. These are a picture of America "back then".
Back when women never wore pants, men always dressed up in suits when they went out in public, even though they wore hard hats or bib overalls for working. I know my own uncles did way back then.