In June 1812, Ten Eyck was elected as a Federalist to the New York State Assembly representing Jefferson County, serving from July 1, 1812 until June 30, 1813.
ɪn dʒˈuːn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd twˈɛlv, tˈɛn ˈaɪk wʌz ᵻlˈɛktᵻd æz ɐ fˈɛdɚɹəlˌɪst tə ðə nˈuː jˈɔːɹk stˈeɪt ɐsˈɛmbli ɹˌɛpɹᵻzˈɛntɪŋ dʒˈɛfɚsən kˈaʊnti, sˈɜːvɪŋ fɹʌm dʒuːlˈaɪ wˈʌn, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd twˈɛlv ʌntˈɪl dʒˈuːn θˈɜːɾi, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd θˈɜːtiːn.