Well Dave, that’s still a lot. First off, it depends on the town size, Mac Donalds per say, didn’t put up restaurants in every town, there had to be a certain population.Ditto most chain restaurants.
Grocery stores are regional, same for discount department stores( K-Mart,Ames, etc), same for drug stores which started being corporate.
Gas stations were still popular, but starting to decline, convenient stores were using old gas stations. Industrial buildings were both old brick (dpm/walthers modulars, factories) and metal (micro engineering).
Shopping plazas (strip malls) were common, usually next to a name store. Bigger towns had indoor malls.
Downtown was usually an eclectic collection of mom and pop shops, restaurants, druggist, tv repairs, doctors, lawyers, clothes stores, the police, fire departments, town hall, barbershop, and maybe a small department store, sometimes with three stories. If you were lucky enough your town still had a movie theater, bakery and butcher shop. Bigbox home improvement centers (Lowes/Homedepot), were still years away, so small lumber/building supply businesses were still around, although regional- ly,a Rickels or 84 lumber and others started in many areas.
Coke, Pepsi, 7-up, they’re common just use right year color schemes. Beer advertising still popular, ditto cigarettes.
Basically alot of depends on what region you’re modeling as to specifics, I hope this helps,mike h.