The Isle of man census for 1841-1901 are included in the general UK census.

The 1881 census is on line at www.familysearch.org.

Be aware that due to phonetic renditions of names and errors in transcription you may have to submit multiple searches using various spellings.

If you want your own copies of the census materials they are available as microfiche from the National Archives. Expect to pay up to 300.00 sterling for each census.