1860 Census for Stafford County, Virginia - Post Office Stafford Court House
Note that many of the census records for Gallahan have the name as Gollahan, Gollihorn and other variations.
Series M653, Roll 1375
Stafford County, Virginia - Post Office Staffd CHse
page 22 (840)
21 June 1860
Line 2, Dwelling 164, Family 164
Thos Gollahan 43 M - Farmer 800 200 " - - - -
Sarah " 37 F - - - - " - - -
Luke " 7 M - - - - " - - -
Daniel " 3 M - - - - " - - -
Mary Ann " 1 F - - - - " - - -
Rebecca Dent 35 F - - - - " - - Insane
Jos English 7 M - - - - " - - - -
I believe this Thomas Gollahan is Thomas Benjamin Gallahan born 4 Aug 1818, died 20 Aug 1883 in Stafford County, VA. He married about 1834, Sarah A. ___, born 15 Aug 1823, died 7 Jan 1907.
Thomas and Sarah Gallahan are buried in a cemetery located on Morning Dove Drive in the Quail Run Subdivision. The cemetery is located in a front yard and is maintained by the residents.
The birth, death and burial information for Thomas and Sarah Gallahan is from Stafford County Virginia Cemeteries and Churches in the Stafford County, Virginia, pages of the US GenWeb Project.
The Washington Post
Washington, D. C.
January 9, 1907
Fredericksburg. Jan. 8. - Mrs. Sarah Gallahan, widow of Thomas Gallahan, of Stafford County, died last night at her home, near Stafford Court House, at the advanced age of eighty-four years. Two sons and one daughter survive her.
Please note that I am not related to the Gallahan family. I'm doing some genealogy for one of my aunts.