The family Argasidae is represented in California by the following taxa:

Genus Argas Latreille 1796
    Argas brevipes Banks 1908
    Argas cooleyi Kohls and Hoogstraal 1960
    Argas giganteus Kohls and Clifford 1968
    Argas persicus (Oken 1818)
    Argas sanchezi Dugès 1887
Genus Ornithodoros Koch 1844
    Ornithodoros concanensis Cooley and Kohls 1941
    Ornithodoros coriaceus Koch 1844 - Pajahuello Tick
    Ornithodoros dyeri Cooley and Kohls 1940
    Ornithodoros hermsi Wheeler, Herms and Meyer 1935
    Ornithodoros kelleyi Cooley and Kohls 1941
    Ornithodoros parkeri Cooley 1936
    Ornithodoros rossi Kohls, Sonenshine and Clifford 1965
    Ornithodoros sparnus Kohls and Clifford 1963
    Ornithodoros stageri Cooley and Kohls 1941
    Ornithodoros talaje (Guérin-Méneville 1849)
    Ornithodoros turicata (Dugès 1876)
    Ornithodoros yumatensis Cooley and Kohls 1941
Genus Otobius Banks 1912
    Otobius lagophilus Cooley and Kohls 1940
    Otobius megnini (Dugès 1884) - Spinose Ear Tick