| Surname | Given name | Location | Item |
| Cables | Elizabeth Morton | Massachusetts | 1890 New Bedford, Massachusetts photo album: Berta Naomi Holcomb (1872 – 1949) |
| Caldwell | J.K. | Ohio | 1841-1860 Washington Presbyterian Church Minutes, Guernsey County, Ohio |
| Campbell | Maggie | Kentucky | Pearl H. Mountjoy Autograph Book |
| Campbell | Samuel | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Campbell | William | Ohio | 1841-1860 Washington Presbyterian Church Minutes, Guernsey County, Ohio |
| Cannon | Sam B. | Kentucky | Cadiz High School, Trigg County, Kentucky, 1924 commencement exercises program |
| Carlson | Eva Charlotta | Massachusetts | Iwan and Eva Carlson Photograph, 1905 |
| Carlson | Iwan Ehrnfred | Massachusetts | Iwan and Eva Carlson Photograph, 1905 |
| Carpenter | Catherine S. | Kentucky | 1852 Letter: Luther Howard of Louisville, Jefferson County, Kentucky, to Flecher Archer |
| Carpenter | Horace | Massachusetts | 1890 New Bedford, Massachusetts photo album: Gertie Evelyn Tripp (1872 – 1937) |
| Castle | John T. | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Caswell | Byron Sanderson | Massachusetts | 1890 New Bedford, Massachusetts photo album: Sarah A. “Sadie” Lowe (1872–1909) |
| Caswell | Curtis | Massachusetts | 1890 New Bedford, Massachusetts photo album: Sarah A. “Sadie” Lowe (1872–1909) |
| Catlett | Jackie E. | Kentucky | Pearl H. Mountjoy Autograph Book |
| Causey | Wyatt | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Cecil | Martha | Kentucky | 1848 Letter: L. W. Gunther to Charles H. Blake |
| Chadwick | John | Massachusetts | Lydia Ann Chadwick’s Peace Catechism of 1816 |
| Chadwick | Lydia Ann | Massachusetts | Lydia Ann Chadwick’s Peace Catechism of 1816 |
| Chadwick | Mary Barlow | Massachusetts | Lydia Ann Chadwick’s Peace Catechism of 1816 |
| Chadwick | Moses | Massachusetts | Lydia Ann Chadwick’s Peace Catechism of 1816 |
| Chadwick | Sarah Lincoln | Massachusetts | Lydia Ann Chadwick’s Peace Catechism of 1816 |
| Chamberlin | Thomas | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Champlin | Mary Eliza | Massachusetts | 1890 New Bedford, Massachusetts photo album: May Eleventh Stetson (1872–1901) |
| Chapman | Ann | Massachusetts | 1890 New Bedford, Massachusetts photo album: Cyrus Chapman Howland (1871–1920) |
| Chapman | Caroline D. | Massachusetts | 1890 New Bedford, Massachusetts photo album: Blanche Russell Howland (1872–1947) |
| Chappell | Wesley | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Chappell | Weston | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Chittenden | M. B. | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Chubbuck | Alice | Massachusetts | 1890 New Bedford, Massachusetts photo album: Annabelle Chubbuck (1872–1952) |
| Chubbuck | Annabelle | Massachusetts | 1890 New Bedford, Massachusetts photo album: Annabelle Chubbuck (1872–1952) |
| Chubbuck | Franklin Benson | Massachusetts | 1890 New Bedford, Massachusetts photo album: Annabelle Chubbuck (1872–1952) |
| Clark | J. H | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Clark | Samuel | Ohio | 1841-1860 Washington Presbyterian Church Minutes, Guernsey County, Ohio |
| Clarke | Amanda J. | Massachusetts | 1890 New Bedford, Massachusetts photo album: Deborah “Dora” Amanda DeWolf (1873–1971) |
| Clifford | Collins Venacius | Illinois | Collins Venacius Clifford photographs |
| Clifford | John C. | Illinois | Collins Venacius Clifford photographs |
| Cochran | Thomas P. | Ohio | 1841-1860 Washington Presbyterian Church Minutes, Guernsey County, Ohio |
| Cohn | Loretta Walker | Kentucky | Pearl H. Mountjoy Autograph Book |
| Colcord | Otis B. | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Colcord | William S. | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Collett | Lemuel G. | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Collins | Mary E. | Illinois | Collins Venacius Clifford photographs |
| Comer | Allen | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Comer | John W. | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Comer | N. E. | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Comer | William A. | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Connell | John M. | Ohio | Morgan County, Ohio 1864 Union Presidential Ticket ballot |
| Cooke | John | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Cornell | Edith | Massachusetts | 1890 New Bedford, Massachusetts photo album: Harriet Love Cornell (1871–1963) |
| Cornell | Godfrey, Jr | Massachusetts | 1890 New Bedford, Massachusetts photo album: Harriet Love Cornell (1871–1963) |
| Cornell | Harriet Love | Massachusetts | 1890 New Bedford, Massachusetts photo album: Harriet Love Cornell (1871–1963) |
| Craig | Samuel | Ohio | 1841-1860 Washington Presbyterian Church Minutes, Guernsey County, Ohio |
| Crocker | Samuel H. | Illinois | Greenville, Bond County, Illinois Poll Book, 16 May 1863 Election |
| Crute | Maurine | Kentucky | Cadiz High School, Trigg County, Kentucky, 1924 commencement exercises program |
| Cunningham | John | Ohio | 1841-1860 Washington Presbyterian Church Minutes, Guernsey County, Ohio |
| Cunningham | Ruby Grace | Kentucky | Cadiz High School, Trigg County, Kentucky, 1924 commencement exercises program |
| Cunningham | Ruby Pearly | Kentucky | Cadiz High School, Trigg County, Kentucky, 1924 commencement exercises program |
| Curns | Cora Gabrielle | Missouri | Cora Gabrielle Curns Smith photograph, ca. 1890s, St. Louis, Missouri |
| Curns | Thomas H. | Missouri | Cora Gabrielle Curns Smith photograph, ca. 1890s, St. Louis, Missouri |
| Curtis | Mary l. | Massachusetts | 1890 New Bedford, Massachusetts photo album: Caroline “Carrie” Bradford Nye (1871–1905) |
