Mills of Northern Ireland

Looking for information regarding the Mills family in Donegal and Fermanagh Counties, Ireland circa 1775 - 1859.

Other surnames in this group:
Foster, John (Constable)
Foster, Elizabeth (daughter of above)
Johnston, Johanna (possibly Dublin or Kesh, Fermanagh)
Johnston, James (father)
Mills, Francis (born in Fermanagh)
Mills, James I (born in Fermanagh)
Mills, James II (born in Dublin)