Six. Vikings, Falcons, Cowboys, Lions, Texans, and Saints.
Yes they have indoor fields.
There is about 120 different ones.
About 37,813 US NFL football fields.
About 105 (105.876124933827422) US NFL football fields.
About four (3.78129) US NFL football fields.
20
Yes NFL football fields are out side
122 fields (US, NFL) with room left over.
About 32 (31.76283748) US NFL fields.
18 total
About 34 (34.3798) US NFL football fields. One US NFL football field is 1.3223 acres.
266,492 US, NFL fields with some room left over.