There are a certain amount of doe tags for each WMU. You can apply for a tag around July or August. Non-residents can apply after that. If there are any left, you can apply for a second tag. Usually you get one.
Down by the cities, they have a lot more. Some guys get 5-10. But in the rural areas, it's usually only one. If you don't send out for a tag by around Labor Day, you're usually SOL in the rural areas.
So, the short answer is: usually one tag in the country and 5 or more in the suburbs.