On 8 Dec 1815 when Simeon was 27, he first married Nancy Carver (63290) , daughter of Alanson Carver (56286) (ca 1765-6 Feb 1820) & Huldah Barstow (30 Jan 1760-10 Feb 1820), in Marshfield, MA. Born on 27 May 1795 in Marshfield, MA. Nancy died in Marshfield, MA, on 28 Jun 1828; she was 33. Buried in Centre Marshfield Cemetery.

On 16 Aug 1829 when Simeon was 40, he second married Betsey Lewis (62361) , daughter of Bela Lewis (53371) (ca 1761-28 Mar 1841) & Mercy Lapham (55821) (3 Sep 1763-22 Feb 1810), in Marshfield, MA.

Marshfield Town Records
    Marriages consumated by the Revd. Elijah Lenoard:
    Simeon Keen and Betsey Lewis of Marshfield married September 2d 1829