yes, Rockwall county was formed in 1873, but the LAND & PEOPLE (NONE of whom were "enumerated") were there.
as for Dallas & Tarrant counties, ONLY those persons residing on the NORTH & EAST banks of the rivers were counted, as the bridges were "OUT" during the census. Dallas County was "undercounted" by about 80%! nobody is sure what "the undercount" in Tarrant was.
free dixie,sw
So they made these figures up? link
You just can't win, can you, Watie? The people in the Rockwall area were counted: