Please have a read through Please Reevaluate Wayfarer Criteria for Rural Areas
There are often comments from players who say they are in rural areas and are having trouble finding things to submit. This thread contains a discussion about this and suggests for what would be eligible.
Sometimes people find there is more than they expected.
Please note that lots of things are different in the countryside than in urban areas. Shops are further away, schools are further away, hospitals are further away and lots of things are harder to get to. Pokemon Go is not unique in being a different experience in rural areas than busy inner-city areas.
(Also, suburban areas can be surprisingly empty of interesting things, so players there sometimes have similar problems with playing on their doorstop.)