* _The Substance and Show of Christianity_ (1857)
* _Christianity and Spiritualism_ (1858)
* _Patriotism and Other Papers_ (1864)
* _The White Hills: Their Legends, Landscape, and Poetry_ (1860)
Sermons
* "The Substance of Christianity" (1853)
* "The Relation of Christianity to Spiritualism" (1854)
* "Patriotism" (1861)
* "Lincoln's Emancipation Proclamation" (1863)
* "How Shall We Celebrate the Fourth?" (1864)
Lectures
* "The North and the South" (1856)
* "American Slavery" (1857)
* "The Causes and Consequences of the Rebellion" (1862)
* "Reconstruction" (1865)
* "The Future of California" (1867)
Letters
* _The Complete Letters of Thomas Starr King, 1841–1864_ (edited by Richard W. Etulain and Michael J. McShane) (1997)