A head to head comparison of the Missouri 2018 General Election gives us an idea of the break down of the voters.
Josh Hawley received 1.25M (51.38 %) votes, beating Claire McCaskill who gained 1.11M (45.57 %) by 141.99k votes in Missouri.
Claire McCaskill won 5 counties out of the 115 counties that make up Missouri. The record shows that Josh Hawley won 110 counties.
During the 2018 general elections, over 2M total number of votes were cast. Claire McCaskill got 1,112,935 (1M) over Craig O'Dear 34,398 (34k). He won the popular vote by 1,112,935 (1M). His victory in the State of Missouri (with 1,112,935 votes) represents 50.0% of his popular vote victory.
Top 15 Counties in General Elections
All Candidates (Senate General Elections)
These 15 counties play an important role in these Primary elections. If a candidate, can get a sizable majority in the largest counties (St. Louis County, St. Charles and Jackson), it becomes very difficult to win majorities in the smaller counties without voter outreach and increased voter participation in them.
Top 15 Counties Comparison in General Elections
St. Louis County, Jackson and St. Louis City, three of the larger counties voted in favor of Claire McCaskill, giving him a 195k vote advantage.