He is listed as a militia officer in Warren, Maine: "Ensign, March 29, 1834, Lieut. Apr. 28, 1836, Rifle co."
The 1842 New Orleans City Directory has this.
M'Clellan, A. . . . wharf builder . . . Clio b. Bacchus & Apollo Sts.
WHP moved from Maine to New Orleans. His brothers James Brackett, George Merrill, and Edward Cutter also apparently travelled to New Orleans with him, and were married there. There is also a death record for Thomas McLellan, his brother (who died 1882 of "general paralysis of the insane"?!--see the image of his death certificate). They were ship chandlers, and some of their business papers are preserved at the Special Collections department at Tulane University ("McLellan Papers 1839-1884, 92 items," kept in their Manuscripts Collection on Resources for Waterways Transportation).
His death certificate implies he moved to New Orleans ca. 1845.
He is apparently the "William H. McLellan" who is the holder of two Louisiana Patents for a "fare box," to hold money securely (no. 5,491, patented 1867, and no. 63, 804, patented 1867). See the the website on "Index to Early Louisiana Patents, 1810-1890."
He is buried in the McLellan tomb in Lafayette Cemetery; here is the inscription:
WM. H. McLELLAN BORN SEPT. 30, 1811 DIED APRIL 24, 1895 [OBVERSE] WM. H. McLELLAN [5, 6]
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