Texas had 336 types and is in the process of removing many of them. The plates have to
have at least 200 users per year and there are some 87 or so that don’t meet that requirement.
texas-dmv-trims-number-specialty-license-plates
Link to info in post above:
http://amarillo.com/news/local-news/2014-07-18/texas-dmv-trims-number-specialty-license-plates