There aren’t any hard facts that I can find. One only needs to look at minority populations and make an educated guess.
The Top 20 States with the highest illegal population, as of the 2000 Census, are:
# 1 California: 2,209,000
# 2 Texas: 1,041,000
# 3 New York: 489,000
# 4 Illinois: 432,000
# 5 Florida: 337,000
# 6 Arizona: 283,000
# 7 Georgia: 228,000
# 8 New Jersey: 221,000
# 9 North Carolina: 206,000
# 10 Colorado: 144,000
# 11 Washington: 136,000
# 12 Virginia: 103,000
# 13 Nevada: 101,000
# 14 Oregon: 90,000
# 15 Massachusetts: 87,000
# 16 Michigan: 70,000
# 17 Utah: 65,000
# 18 Minnesota: 60,000
# 19 Maryland: 56,000
# 20 Pennsylvania: 49,000
The order may have changed slightly, but the numbers have increased.
Ah, Maryland 19th? I doubt it. In some parts English is a second language. There are probably 56,000 Illegals in Mont. Co. alone.
That list, coming from the Census, is going to understate illegal immigrants, for one.
For two, it’s a decade old. Conservative estimates of the illegal population in North Carolina top half a million now.