Miscellaneous References and Mentions

While our initial information about Opal came from various goverment sources (GNIS, US Census, FIPS), we also found mention of Opal in various books and other sources.

We've created the following list to keep track of the sources that proved useful in adding to our knowledge about Opal. We hope that they will be useful to you.

Note: Initially, we were careless about keeping track of where our Opal data came from. The following list of references and mentions is incomplete.

Opal is contained in a comprehensive list of Post Offices that was created by Cameron Blevins and Richard Helbock.<1>

We found Opal in these Censuses: 2010-1990. See our Census Page for Opal for more information.

Both the GNIS and FIPS databases contain entries for Opal. See our Misc Page for Opal for more information.