Capitals are a type of town where the government of the county takes place. Those who live in the capital may only own one field and those who visit for extended periods of time can buy an apartment instead of paying the one-pound fee to stay there overnight.
Eventually, all council members will have to stay in the capital in an apartment in order to perform their job. University students will also have to stay in the capital to study. These features have not yet been implemented, however.