A head to head comparison of the Nevada 2020 Primary gives us an idea of the break down of the voters.
Bernie Sanders received 6,788 (47%) votes to beat Joe Biden, who received 2,927 (20%) votes and Donald Trump, who received no votes. There was no Presidential Primary for the Republican Party in the State of Nevada, thus there are no results for President Trump at the Primary level.
In the Primary, Sanders won 12 counties in the 5-way match up. Steyer (winning 1 county) trailed behind Buttigieg winning 4 counties with Trump and Biden winning nothing in Nevada Primary. There was no Presidential Primary Elections for the Republican Party.
Bernie Sanders vs Joe Biden
In the head to head match up, Sanders (70%) beat Biden (30%).
These 10 counties play an important role in these primary elections. Clark county is impressively and significantly larger than the other counties. Winning Clark is essential to winning the Primary elections in the state of Nevada.
The county of Clark (the largest one in Nevada) voted in favor of Sanders, giving him over 2k vote advantage over Biden. Sander's steady win at most counties gave him the upper hand in the State of Nevada. There was no Presidential Primary for the Republican Party in the State of Nevada, thus there are no results for President Trump at the Primary level.
Related References: 2016 Nevada General Election Story, 2016 Nevada Primary Election Story