He was of Scots-Irish descent, his Irish grandfather, also Jeremiah Morrow, had come to America from County Londonderry, and was descended from 17th century Scottish settlers.

He lived at the mouth of the Little Miami River for a short time before moving to what is now Warren County.

[1] As a member of the Associate Reformed Presbyterian Church, he sought the services of a minister of his denomination soon after settling in the region, and he was one of the original elders of the Mill Creek congregation when it was organized shortly before 1800.

[2] After serving in the Territorial House of Representatives and Territorial Senate, and as a Hamilton county delegate to the 1802 Constitutional Convention,[3] he was elected to the first State Senate a year later and served six months before becoming Ohio's first member of the United States House of Representatives.

Morrow was sent back to Washington again in 1841, and served two more years in the House, but refused to be renominated in 1842, believing himself too old.