His works are located at:
Brown University:
ACCESS RESTRICTED. APPOINTMENT REQUIRED
1. Oil portrait, "Adoniram Judson" (1846) (unlocated as of 2007)
2. Oil portrait, "Henry Wheaton" (acc.# BP 157) (unlocated as of 2007)
3. Oil portrait, "Levi Wheaton" (acc.# HP 01851) (Hay Lib.)
4. Oil portrait, "William Clarke Sayles" (1881) (acc.# BP062) (Sayles Hall)
5. Oil portrait, "William Francis Sayles" (1889) (acc.# BP063) (Sayles hall)
6. Oil portrait, "Francis Wayland" (1846) (acc.# HP 00589) (Sayles Hall)
7. Oil portrait, "Francis Wayland" (1846) (Admissions 105)

City Hall, Providence:
1. Oil portrait, "Thomas Burgess" (1852)

Newport Historical Society:
1. Oil portrait on canvas, "Mrs. Charles C. Van Zandt" (ca. 1853) (acc.# 75.2.1)

PSNC:
Building location: Chateau-sur-Mer
1. Oil painting [untitled]--genre scene of a girl carrying a basket of flowers (1886) (acc.# PSNC.4506)
2. Oil on canvas mounted on panel [untitled]--portrait of an unknown gentleman (1840) (acc.# PSNC.4397)
3. Oil on canvas portrait, "George Peabody"--attributed to Healy (acc.# PSNC.4468)


Redwood Library:
1. Oil portrait, "Franklin Pierce" (acc.# RLC.PA.035)
2. Oil painting, "Self-Portrait" (1841) (acc.# RLC.PA.034)

Rhode Island Historical Society:
ACCESS RESTRICTED. APPOINTMENT REQUIRED
1. Oil portrait, "Henry Wheaton" (ca. 1846-47)
2. Oil portrait, "Thomas Frederick Hoppin" (1859) (acc.# 1973.22.1)
3. Oil portrait, "Dr. William Grosvenor" (1859) (acc.# 1975.12.1)
4. Oil portrait, "Candace Crawford Carrington" (acc.# 1962.3.377)

RISD:
1. Oil on canvas, "Portrait of Miss Sneyde" (ca. 1866) (acc.# 1999.90)
2. Engraving, "Portrait of Joseph Hume"--(designer, W. Holl) (acc.# INV2006.105.13)

Source:
Unveiled: a directory and guide to 19th century born artists active in Rhode Island, and where to find their work in publicly accessible Rhode Island collections by Elinor L. Nacheman

Born and raised in Boston to impoverished parents, George Healy was one of the best-known portrait painters of the mid to late 19th century. He also did occasional genre and historical subjects.

His painting talent was recognized by society sitters and specifically by the renowned portraitist Thomas Sully. Portrait subjects included the last-known portrait of a clean-shaven Abraham Lincoln as well as Daniel Webster, Franz Liszt, Louisa May Alcott and Henry Wadsworth Longfellow.

At age 17, Healy opened a portrait studio, and one of his early patrons was Mrs. Harrison Gray Otis. At age 21 in 1834, Healy, supported by Sully and Otis, left for the first of many trips to Paris where he studied with Antoine Jean-Gros and with Thomas Couture, who became a close friend. He was in Paris for many years as a court portrait painter and gained an international reputation. He spent the remainder of his life traveling between the United States and Europe, making 35 Atlantic Ocean crossings.

In 1855, he established a home in Chicago from which he frequently traveled to the East Coast and the South to paint portraits of leading politicians and aristocrats, completing about 100 of them a year. After the Civil War, he returned to Europe for 25 years but left at age 79 because of his disdain for the new turns of the Parisian art scene that included Impressionism.

Sources:
Michael David Zellman, "300 Years of American Art"
Michael Worley, Ph.D., footnotes to his AskART biography of R.A. Clifford
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Note (Anonymous). I'm an alumnus of Coe College in Iowa, and I know that Coe has at least two portraits by G.P.A. Healy. I was reviewing your review of Healy and noticed the museum area. When I was a student many years ago, I saw the two Healy portraits -- of Judge Greene and his wife.