Canonicus-class monitor Ships Ships

| Ship | Builder | Namesake | Renamed | Laid_down | Launched | Commissioned_or_completed_ |
|---|---|---|---|---|---|---|
| Ajax | Snowden & Mason, Pittsburgh, Pennsylvania | Manayunk, Philadelphia | Manayunk, 1862; Ajax, 15 June 1869 | 1862 | 18 December 1864 | 27 September 1865* |
| Canonicus | Harrison Loring, Boston, Massachusetts | Canonicus | Scylla, 15 June 1869; Canonicus, 10 August 1869 | 1862 | 1August1863 | 16 April 1864 |
| Catawba | Alexander Swift & Company, Cincinnati, Ohio | Catawba River | Atahualpa | 1862 | 13 April 1864 | 10 June 1865* |
| Mahopac | Secor & Co., Jersey City, New Jersey | Lake Mahopac | Castor, 15 June 1869; Mahopac, 10 August 1869 | 1862 | 17 May 1864 | 22 September 1864 |