2(ish). CO is a regular primary in 2020 (post prop 107/108 in 2016). TX democratic party no longer uses caucus.

Several US territories and other states[1] hold democratic caucuses of one form or another, but are less notable due to timing/delegate count.

[1] https://www.nytimes.com/2020/02/04/us/politics/what-states-c...

CO cancelled all caucuses after 2016 when 10's of thousands of people got turned away because most of the gathering places were over capacity. Sanders supporters especially felt extremely underrepresented since they were young and showed up less early than others

For 2020 in the Democratic nominating process, 3 states and 3 territories, actually: IA, NV, WY, American Samoa, Guam, and the Virgin Islands.