practiced law with his father and died in 1897 per Mary Frost Jessup’s History of the Jessup Family in Montrose, Pennsylvania

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.