High clouds are anywhere from 5,000m-13,000m high. Some examples of these kinds of clouds are cirrus and cirrocumulus. Contrails are also included in this altitude.
Middle clouds are located anywhere from 2,000m-7,000m high. Examples of these clouds are altocumulus and altostratus.
Low clouds are located from the surface up to 2,000m. Examples of these clouds are cumulus and cumulonimbus.
Cloud height depends on factors such as region.
There are also clouds located in the stratosphere and they are called polar stratospheric clouds. The mesoshpere aslo has clouds called polar mesoshperic clouds.