How many Republican Senators voted yes for the Civil Rights Act of 1964? I am interested in knowing how many senators of each of the party supported...

Very good
question. Here's how the votes tallied:

In the House of Representatives, the
vote was 152 Democrats for, 96 against; 138 Republicans for, 34 against. That is, 61% of the
Democrats and 80% of the Republican members of Congress voted to pass the bill.

In the Senate, 46 Democrats voted for and 21 against; 27 Republicans voted for, and
only 6 voted against the bill. That makes 69% of the Dems and 82% of the Repubs senators voted
to pass the law.

Wikipedia breaks the votes down further into party and
region, and that's where the numbers get very telling:

The
original House version:

• Southern Democrats: 7-87   (7%-93%)
• Southern
  Republicans: 0-10   (0%-100%)

• Northern Democrats: 145-9   (94%-6%)
• Northern
  Republicans: 138-24   (85%-15%)

The Senate version:

• Southern Democrats: 1-20   (5%-95%)
• Southern
  Republicans: 0-1   (0%-100%)
• Northern Democrats: 45-1   (98%-2%)
  
• Northern Republicans: 27-5   (84%-16%)

It's interesting that the one northern Democrat senator
who voted against the bill is still in the Senate: Robert Byrd of West Virginia.

These numbers represent the 1964 Civil Rights Act. Visit the links below for more
information.