Mayor of Chicago, 1861-1862
- Republican Party
- Elected 22nd mayor of Chicago April 16, 1861; defeated Thomas B. Bryan (Union)
- Inauguration: May 6, 1861
- Born April 3, 1823 in Batavia, N.Y.
- Married the daughter of John Turner in 1848; together they had nine children.
- Worked as a grain merchant
- Served as Cook County treasurer and president of the Board of Trade
- Died April 20, 1886 in Chicago
- Buried in Graceland Cemetery, Chicago
- Andreas, A.T. History of Chicago: From the Earliest Period to the Present Time. A.T. Andreas, 1884–86.
- "The Election Yesterday." Chicago Tribune, April 17, 1861, p. 4.
- Grossman, James R., Ann Durkin Keating and Janice L. Reiff, editors. Encyclopedia of Chicago. University of Chicago Press, 2004.
- "Julian S. Rumsey." Chicago Daily Tribune, April 21, 1886, p. 1.