Yes, I looked for both variations. I see you have not been doing genealogy long. The
Johnson name is such a long shot, in
Illinois alone, not to mention the variation of
Johnston. Just for 1850, there are 4,921 Johnsons listed, 0 Tom
Johnson, 92 Thomas Johnsons,and 295 William Johnsons. O Heldrick/Heldrich. What info do you have of the marriage? With no county or city, in
Illinois, it would be very hard to find. I started with the 1850 census, because that is the first year wives names were mentioned unless, they were widowed. Sense i did not find a Hendrick/Hendrich family listed, in the 1800 to the 1850, in
Illinois, it makes it much more harder to narrow down a county, or city. I hope this explains it a little better. If you have any other info i will look further. Good luck. Vidia