It is a powerful research tool to allow researchers to do keyword search across over 400 rare gazetteers and download the content in CVS files. A bunch of visualization tools are provided as well. You need to sign up for a free account to use it. Searches need to be done in traditional Chinese characters.
Although many local Chinese gazetteers are not available for interlibrary loans, the WorldCat may help you to find which institute has the material that you are looking for.