The 1840 Census for Kennebunk Port provided a count of 1 under "Free Colored Persons - Females of ten and under twenty-four" in the household of Eliphalet Perkins. Note that this is Eliphalet Perkins "Senior," as the next census entry is for Elliphalet Perkins Jr.

"Eliphalet Perkins, or 'Life' as he was called, and his sons were the last local merchants to carry on extensive trade with the West Indies ... Although in 1840 the Perkins men were still shipping lumber, ships and hoops to the West Indies, that trade was ending ... Local supplies of timber for export, which must have once seemed endless, were depleted. Vessels that carried American raw materials like cotton to Europe were making the best profits." - Butler, p. 62

Bibliography:

1840 US Census for Kennebunkport

Kennebunkport - The Evolution of an American Town - Vol 1 (1603-1923) - by Joyce Butler (2013)