He was born in Ballyshannon, Co. Donegal, Ireland, and was the son of the manager of a local bank who was of English descent. He obtained a post in the custom-house of his native town and held several similar posts in Ireland and England until 1870, when he had retired from the service, and became sub-editor of Fraser's Magazine, which he edited from 1874 to 1879, in succession to James Froude. He had published a volume of Poems in 1850, followed by Day and Night Songs, a volume containing many charming lyrics, in 1855. Allingham was on terms of close friendship with DG Rossetti, who contributed to the illustration of the Songs. His Letters to Allingham (1854-1870) were edited by Dr. Birkbeck Hill in 1897. Lawrence Bloomfield in Ireland, his most ambitious, though not his most successful work, a narrative poem illustrative of Irish social questions, appeared in 1864. He also edited The Ballad Book for the Golden Treasury series in 1864.