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SICO INDIANS. This name is known from a single Spanish missionary report (1691), which indicates that the Sicos were neighbors of the Hasinai tribes of eastern Texas. It is said that the Sico Indians lived an unspecified distance southwest of the Hasinais. The affiliations of the Sicos remain undetermined.

John R. Swanton, Source Material on the History and Ethnology of the Caddo Indians (Smithsonian Institution, Bureau of American Ethnology Bulletin 132, Washington: GPO, 1942).
Thomas N. Campbell

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The following, adapted from the Chicago Manual of Style, 15th edition, is the preferred citation for this article.

Handbook of Texas Online, Thomas N. Campbell, "Sico Indians," accessed October 25, 2016,

Uploaded on June 15, 2010. Published by the Texas State Historical Association.