Geronimo Ybarra was a member of the Los Angeles Common Council, the governing body of that city, in 1859-60. On May 12, 1857, he was elected second lieutenant in a volunteer military organization, Lanceros de Los Angeles, with Juan Sepulveda as captain.
- Chronological Record of Los Angeles City Officials,1850-1938, compiled under direction of Municipal Reference Library, City Hall, Los Angeles (March 1938, reprinted 1966). "Prepared ... as a report on Project No. SA 3123-5703-6077-8121-9900 conducted under the auspices of the Works Progress Administration."
- J.M. Scammell, "Military Units in Southern California, 1853–1862," California Historical Society Quarterly, volume XXIX, number 3
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