You can find out any information by calling a local school and asking them about boarding schools in the area. They would know about all that kind of stuff.
There aren't any military schools in the DC area just for girls. There are plenty of boarding schools and other types but most of the military schools are co-ed or all for boys.
The biggest list of boarding schools available at the moment is at boarding-school-finder.com there you will find all there is about boarding schools.
In the united kingdom find the ISIS website. This is a organization that all private education boarding schools are part of. You can always try to as they will have a list of best performing schools.
Some of the boarding school areas that you might consider are New York City where all girl boarding schools are more prominent and highly regarded. There are also all girl boarding schools such as the Diamond Ranch Academy, in Utah, or the Annie Wright School, in Tacoma, WA. It all depends on the location you are looking at to choose a good school for your daughter, though.
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There are many boarding schools and military schools or troubled teens in Texas. The following website lists all the boarding schools in the Texas area www.mytroubledteen.com/boarding-schools/texas.html
Not all boarding schools are religious.
Looking at a list on About.com, it looks like most, but not all, are. For instance, I found on in Chester, NJ called the Devereux Deerhaven Center that is non-sectarian.
It depends on what boarding school you are talking about. Not all boarding schools have something wrong with them. You have to be the one to do the research to figure out what will fit your needs and lifestyle.
Yes. To enroll in a boarding school, an application must be filled out and approved. From there, tuition must be paid, thus making all boarding schools considered to be private.
There are plenty of boy boarding schools. However your question is a bit broad. Where is the location of the school you are looking for? Which country, let alone state? However, I will assume you are from the USA. The website below has all the boy boarding's schools in America; http://www.boardingschoolreview.com/all-boys-boarding-schools.php If that is of no use to you, ask around your area and the people that you know of to see if they know of any all male boarding schools.