I am not related to the Fulkerson family, but I noted the following references while doing Brazos Co., TX, historical research, and thought these might help someone else ?
FULKERSON, Isaac, Captain (d.20 July 1889).Buried Bryan; Brazos Co. treasurer
Ran for Brazos Co. treasurer.Galveston Daily News, 3 Aug. 1875, p.1, col.2 *On Federal Grand Jury in Austin, (Austin) Daily Democratic Statesman, 6 June 1876, p.3 Bryan...Our Commissioners Court, to-day, elected Capt. Isaac FULKERSON, county treasurer, in place of Dr. McLELLAND, who died recently.A better man for the place could not have been found, and the appointment gives general satisfaction.Galveston Daily News, 21 Dec. 1880, p.1 Elected Brazos Co. treasurer.Galveston Daily News, 16 Nov. 1882, p.1, col.5 Involved in lawsuit over Col. T.D. WILSON's estate.Galveston Daily News, 29 Mar. 1883, p.1, col.5 Ran for Brazos Co. treasurer.Dallas Weekly Herald, 31 July 1885,p.4, col.5 Bryan...Capt. Isaac FULKERSON died at his home in this city last evening, aged 58 years.Captain FULKERSON, a Virginian by birth, was 1 of Bryan's best citizens, honored & respected by all.He was a Mexican War veteran & a captain in Terry's Rangers in the late war. For a number of years he held the office of county treasurer & he was also a successful merchant. The funeral took place this afternoon. Galveston Daily News, 21 July 1889, p.2.[Also, Brenham Daily Banner, 23 July 1889, p.1, col.3] "Mrs. M.L. Fulkerson Dead," (weekly) Bryan Eagle, 16 Feb. 1905, p.1, col.2