Bill, If you're still looking for Stillman Elsemore, here are some possible leads. Please note that the surname is spelled both "Ellsmore" and "Elsemore." Gravestones for the earlier generations have "Ellsmore," later ones "Elsemore."
I suspect that your "Stillman Elsemore" may be "George Stillman Elsemore/ George S. Elsemore." During the 19th century, folks seem to use first and middle names at whim, just to confuse us all.
In Elsemore notes recently forwarded to me: Calais, ME 1870 census: George S. Elsemore & wife Clara (ages not noted by correspondent) children: George D. age 9 Rodnew age 8 Ameda age 5 William R. age 2
Civil War records: George S. Ellsmore of Calais, age 22, enlisted 16 Sep 1861, mustered 22 Sep 1861 to serve 3 yrs. as private (later promoted to corporal) Co A, Maine 9th Infantry. Discharged 13 Jul 1865. Resident of Crawford, ME, born Calais. Occupation: millman, stood at 5' 7 1/4", had a light complexion, hazel eyes, brown hair.
Maybe the "George S." in this household: 1850 Census Calais, ME Moses Elsemore & Lucy (ages not noted by correspondent) Sophia age 22 George S. age 10 ["Moses" may be Moses Elsemore, Jr b 31 Aug 1789, Machias, ME m.16 Jul 1814 Machias, ME by William Simpson, Esq. Lucy Foster (dau John Wooden Foster & Lucy Chase)]
From Calais, ME vital records book (I read the orginal on microfilm) : marriage intentions: William Keen and Martha L. Ellsmore, both of Calais, 7 Oct 1843.