Marilyn, The Roll # is the microfilm Roll #, you need that to order it. The Image # is Ancestry.com add for the page that a Thomas Sanders is on. You have to pay extra to them for access to the census online. I looked at both entries 1790 Census does not give you alot of detail. Just 1. Names of heads of families, 2. free white males of 16 years and upwards, including head of families, 3. free white males under 16 years, 4. free white females including heads of families, 5. all other free persons and 6. slaves Charles County 1.Thomas Sanders 2.1 3.1 4. 5 5. 0 6. 0 with a total of seven in household. Queen Annes County 1. Thomas Sanders 2. 1 thats just Thomas listed. I hope this helps.