Based on the partial code, probably something like this.

1. int row; // global variable outside draw and setup
   
2. 
   
3. if(millis() > start && millis() % 200 == 0 && row < firstRowCount) {   
4.   row++;
5.   float x = firstLocationTable.getFloat(row, 1) * 2 + 250;  // column 1
6.   float y = firstLocationTable.getFloat(row, 2) * 2 + 100;  // column 2
7.   ellipse(x, y, 3, 3);
8.   fill(192, 150, 0, 10);
9. }

Thanks! The points do now flicker but they disappear almost as quickly as they appear. Is there a way to keep them drawn and have them accumulate on screen? 

Just don't call background()? (move the line to setup().)

Perfect. Thank you! My mistake.