A head to head comparison of the New York 2020 Primary gives us an idea of the break down of the voters.
Joe Biden received 840,266 (81%) votes to beat Bernie Sanders, who received 201,819 (19%) votes. There was no Presidential Primary for the Republican Party in the State of New York, thus there are no results for President Trump at the Primary level.
In the Primary, Biden won all 62 counties in the 2-way match up, with Sanders winning nothing in New York Primary. There was no Presidential Primary Elections for the Republican Party.
These 10 counties play an important role in these primary elections. Even if a candidate can get a sizable majority in the larger counties (Brooklyn, Queens and Westchester), it is possible for the other candidate to catch up from the smaller counties.
Bernie Sanders vs Joe Biden
In the head to head match up, Sanders (81%) beat Biden (19%).
Bernie Sanders
Joe Biden
Brooklyn, Queens and Westchester, the three largest counties, voted in favor of Biden giving him over 191k vote advantage over Sanders. Biden's steady win at most counties gave him the upper hand in the State of New York. There was no Presidential Primary for the Republican Party in the State of New York, thus there are no results for President Trump at the Primary level.
Related References: 2016 New York General Election Story, 2016 New York Primary Election Story