died in 1853 per Mary Frost Jessup’s History of the Jessup Family in Montrose, Pennsylvania

1860FCI WmJessup Jr & Sr fam; Pennsylvania > Susquehanna > Montrose; image 24 of 32 @ancesttyr.com; Source Citation: Year: 1860; Census Place: Montrose, Susquehanna, Pennsylvania; Roll: M653_1186; Page: 527; Image: 57; Family History Library Film: 805186
William Jessup; home Montrose, Susquehanna, PA; age 63; b abt 1796; New York; Male; Post Office: Montrose; Roll: M653_1186; Page: 527; Year: 1860; HOH: William Jessup
HOusehold:
Amanda Jessup, age 61, b abt 1798 in New York
Saml Jessup, age 26, b abt 1833 in Pennsylvania
Faney Jessup, age 24, b abt 1835 in Pennsylvania
George Jessup, age 22; b abt 1837
Anna Jessup, age 19; b abt 1840 in Pennsylvania
Hunting Jessup, age17, b abt 1842 in Pennsylvania
Next Household:
W H Jessup, age 30, b abt 1829 in Pennsylvania
Sarah Jessup, age 26, b abt 1833 in New Jersey
Lillie Jessup, age 5, b abt 1854 in Pennsylvania
William Jessup, age 2, b abt 1857 in Pennsylvania
Mary C Jessup, (b abt 1860) age 3.12,in Pennsylvania
and 2 servants

1870FCI Wm H Jessup & Family; United States Federal Census > Pennsylvania > Susquehanna > Montrose; image 37 of 37 @ancestry.com; Source Citation: Year: 1870; Census Place: Montrose, Susquehanna, Pennsylvania; Roll: M593_1454; Page: 170A; Image: 170; Family History Library Film: 552953
listed:
Father William Jessup, lawyer, age 40
wife Sarah, 36
Lillian, 15
William, 11
Mary, 9
George, 8
Sarah, 6
Annie, 3
and 7 other unrelated people

1880FCI William Hunting Jessup and family; Pennsylvania > Susquehanna > Montrose > District 132; image 31 of 35 @ancestry.com; Census Place: Montrose, Susquehanna, Pennsylvania; Roll: T9_1196; Family History Film: 1255196; Page: 312C; Enumeration District: 132; Image: 0617.