A host country usually reaps the benefit of hosting the games. Since their athletes are native to their land the cost of transporting them and training them is usually limited.
This is why host countries usually do better at home than away.
So which host country has won the most gold medals at home?
The United States won 83 gold medals in 1984. This was the year of a boycott.
The United States also won 80 gold medals in 1904.