The states with the largest populations of either Scottish or Scotch Irish ancestral origin: California - 677,055 (1.7% of state population) Texas - 628,610 (2.8%) North Carolina - 475,322 (4.5%) Florida - 469,782 (2.3%) Pennsylvania - 325,588 (2.5%) Ohio - 314,214 (2.7%) Georgia - 293,211 (2.8%) More items...