It looks to me as if the Vernon & Monroe Co., WI, HANCOCK families were related, since there are quite a few references to Pennsylvania.
A Bradford Co., PA, query on USGenWeb says that George HANCOCK had sons Reuben, b. 1830; Amasa, 1832; Ben, 1835; Charles, 1837; Mary Ann, 1839; Henry, 9 Apr. 1842; George, 1 July 1844; & David, b. 5 Apr. 1846, all born in PA; & William, b. 1851, WI. In 1850, there was a Reuben of the right age of El Dorado Co., CA. The rest of the family was in Wisconsin, but the birth dates of Henry & George don't match. In 1870, Henry's age, 28, and George, 25, do match.
In 1820, there was an Abner HANCOCK of Erie Co., PA.
Ancestry databases are not always complete, but I don't see any HANCOCK of Bradford Co., PA, until 1830, when there were Abner, Amasa (2), George W., & Jessee HANCOCK.
In 1840, Bradford Co., PA: Abner, Amasa, Elizebeth, George, Leroy, & Pliny HANCOCK.
In 1850, Bradford Co., PA, the eldest HANCOCK was Abner, b. ca. 1784. His wife must have been deceased. The entries are listed in order of age, not by households. After Abner, there were Amasa, 46; Delilah, 42; Plenney, 34; William, 30; John, 29; Lucy, 26; Saloma, 25; Jerusha, 22; Henry, 21; Mahala, 19; Mary, 18; Samantha, 14; Hannah, 13; Richard, 11; James, 8; Zenas, 7; Sully, 6; E. W., 4; Rebecca, 4; Eunice, 3; Francis, 2; Louisa, 1; Russel, under one.
RootsWeb: Abner HANCOCK, b. ca. 1784, CT, had son George (1812 {?}, Asylum Twp., Bradford Co., PA - 1870, Vernon Co., WI) who m. 1829 {groom aged 17?}, Bradford, PA, Eunice BARNES, b. 15 Feb. 1810, Asylum, PA. George & Eunice had son David (5 Apr. 1846, Bradford Co., PA - 9 Oct. 1911, Kingsville, Johnson Co., MO) m. 20 Dec. 1863, Burnett Co., WI, Lavina Ruth BRIGGS, b. 17 Sep. 1845, NY.
History of Vernon Co., WI, 1884: The first marriage in Kickapoo Twp. is not positively known. In 1855, Abner HANCOCK was married to Irena HARRISON, dau/o John, at the home of Thomas GILLINGHAM, Readstown, by Orin WISEL, J. P.
Feb. 19, 1862, Lt. T. C. ANKENY started on Monday for camp at Kenosha with recruits for Col. DANIEL's First Wisconsin Cavalry...(including) George W. HANCOCK, Jr.
The only HANCOCK listed in Vernon Co. Tombstone Inscriptions is Ida M. [HANCOCK] (1872 - 1927) wf/o Bart W. WOOD (1872 - 1968), Forest-Burr Cem., Forest Twp.
FamilySearch, Byron, Monroe, WI, 1880, HANCOCK:
David, 36, PA Scot Eng {?}; others: Lavina, 36, IN Scot Eng {?} George, 15; Mary, 13; Jonas, 11; Ida, 9; Marion, 7; Cora, 5; Minnie, 3; Alma, 1.
FamilySearch: Hardin, Greene, IA, 1880, HANCOCK:
Abner, 45, PA PA PA; wf. Irene, 43, IL IL IL
Ch. b. WI: John, 20; Sarah, 13
Ch. b. MO: Willard, 10; Minnie, 3
Ch. b. Iowa: Olive, 3; Annie, 7 mos.
Other, Ida HARRISON, 13, WI IL OH.
Amasa HANCOCK, b. 1832, Asylum, Bradford Co., PA; d. 1910+, WI; m. Elizabeth CULBERSON (May 1837, PA - 12 Feb. 1903, Monroe Co., WI)
Census of 1850, Rock Co., WI, HANCOCK:
George, 37; Eunice, 39; Amasa, 18; Benjn., 15; Charles, 13; Mary, 11; George, 8; Henry, 6; David, 3 {Henry, 8, & George, 5 or 6?}
Census of 1850, Crawford Co., WI, HARRISON: George W., 39; Isabel, 37.
John, 35; Electa, 33; William, 15; Irena, 12; Ellen, 10; Hiram, 10; Sally A., 8; George, 7; Josephine, 5; John, 4; Almena, 2; Electa A., 1.
Viroqua, Bad Ax Co., WI, 1860, HANCOCK:
George, 49; Eunice, 48; Charles, 23; Henry, 18; George, 15; David, 13; William, 9.
Amosy {Amasa?}, 25; Elizabeth, 23; Eunice, 5; Martha, 2
Abner, 24; Juna {Irena}, 22; Ellen, 3; John, 3 mos.
Vernon Co., WI, 1870, HANCOCK, George, 66; Eunice, 67.
Amasa, 37; Elizabeth, 33; Eunice, 14; Francis, 8; Nancy, 7; Matilda, 3.
Henry, 28; Elizabeth, 33; Louretta, 7; Albert, 5; Irena, 3; Ellen, 1.
George, 25; Susana M., 21; David, 4; Mary L., 2.
Webster, Vernon, WI, 1880, HANCOK:
Amasa, 48, PA; wf. Elizbet, 43, PA (birthplaces of their parents not given)
Ch. b. WI: son Frances {Francis?}, 18; dau. Nanze, 16; dau. Marthile, 13; James, 10; Anne, 8; Mary, 3; son Muryoie, 3.
Byron, Monroe, WI, 1900, HANCOCK:
George W., b. July 1845 {1844}, PA _ _, m. 36 y, changed to 25 years
Wf. Ruth, b. Feb. 184_, aged 58, NY NY VT; m. 25 years, 11 ch., 9 li.
Stepsons Claton HANCOCK, Mar. 1879, NY; Fred HANCOCK, Nov. 1892, WI; Carl HANCOCK, July 1886, WI.
[In spite of the name HANCOCK, the sons must have been Ruth's, since they were listed as stepsons, and Claton was b. NY. The number of years of marriage was supposed to be the current marriage, so I'm not sure how that fits.]
HANCOCK: David, b. Apr. 1846, PA PA PA; m. 35 years
Wf. Livina, b. Sep. 1845, IN NY NY, had 13 ch., 11 living.
Ch. b. WI: son Marion, Feb. 1878; Martha, Apr. 1884; dau. Abi, Sep. 1886; Nina, Je. 1888; Joseph, Je. 1892.
< pilot.familysearch.org >
LaFarge, Vernon, WI, 1900, HANCOCK:
David, b. Oct. 1866, WI PA IN, married 13 y.
Wf. Abbie, b. Oct. 1869, WI; 3 ch., living: George, Sep. 1888; dau. Rubby P., Aug. 1892; Gertie, July 1896.
Next household
HANCOCK, Nellie, b. May 1874, WI, wid.; 3 ch., 2 li: Lulu, Dec. 1893; son Willie, Dec. 1896; mother Laura LIBBIE, b. Dec. 1841, had 1 child, 1 living.
In 1910, Amasa HANCOCK, 79, was of Jackson Co., WI, with Frank, 49; Ella, 42; Bert, 19; Pearl, 15; Francis, 13; Grace, 10; Effie, 3; & Theodore, 1.
--not my family