This map, which was generated by the Dallas County Elections Department's website, is color-coded by precinct victories in Texas House District 108. The purple precincts are the ones won by Morgan Meyer. The mint green ones went to Chart Westcott. The few dark green precincts went to Court Alley. And the brown precincts are the ones where there were ties.
I wish there was a way to zoom in and not have to show you the entire county, but there isn't — at least not without distorting the image's resolution. So let me try to help you get your bearings. See the purple portion sticking out on the west side? It's bounded by Northwest Highway to the north, Love Field to the west, and Lovers Lane to the south. And you see the curved line that forms the western edge of the top mint green precincts? That's Central Expressway. (Looking at this map may also help.)
So that means Meyer won every precinct in the Park Cities, Preston Hollow, Bluffview, Devonshire, and Greenway Parks. But Westcott captured plenty of votes east of Central. So the two candidates will keep competing until the May 27 runoff.