In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Claro like this:
CLARO, a wapentake in W. R. Yorkshire. It takes name from Claro-Hill in Allerton-Mauleverer parish; consists of three divisions, Lower, Upper, and Ripon liberty; and contains twenty-seven parishes, and parts of six others. Acres of the Lower d., 140, 640; of the Upper d., 78, 579; of the Ripon liberty d., 35, 795. Pop. of the whole, 49, 476. Houses, 10, 639.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Claro has changed, please see our redistricted information for the modern district of Harrogate. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Claro and units named after it.
GB Historical GIS / University of Portsmouth, History of Claro, in Harrogate and West Riding | Map and description, A Vision of Britain through Time.
Date accessed: 29th July 2014
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Claro".