Can I join a team if I do not visit a city?

I live out in the country, and cannot travel easily. Is there any way I can achieve things like selecting a team?

Other questions cover finding Pokemon and suggest driving to town to find gyms and stops. I can find Pokemon out here using incense; I can afford a few coins to replenish pokeballs, incense, and lucky eggs. I don't want to drive to town. I want to select a team without leaving my home property.

Based on this and this, you actually do need to go to a Pokemon Gym in order to join a team.

As for gyms, they only allow you to get Pokécoins without paying for them. Theoretically, you could play without encountering gyms (or Pokéstops) but you will most likely end up having to pay for pokéballs to catch things and lucky eggs if you want to level up as fast as possible. Unfortunately, Pokémon Go was developed with urbanites and city dwellers in mind. Playing out in the country just won't be as good of an experience as it stands currently.

There is no other way of selecting a team than clicking on a gym first. You don't need to be right next to the gym to do this, you can just click on it from a few blocks away as well. Once you have clicked on the gym, Professor Willow will present the 3 teams to choose from and you can make your choice.

So, in your case I suggest that next time you go to a city, get your cellphone out and click an a gym.