I can not say where they married but I did find David living with his father, Richard, in 1880 and single.They were living in Platte Township, Andrew County, Missouri
Are you sure of David's death date because if so there must have been a divorce because I found the following:
ALLENWALLACE C11MWMOMOBUCHANAN9-WD ST JOSEPH1910
Wallace is listed as the step-son of Melvin O Swope whose wife is Georgia A Swope.Both Melvin and Georgia are listed as on their 2nd marriage and the number of years is listed as 0 so they had been married less than one year. Georgia is listed as born KY as are both of her parents.She is also listed as having 3 children although only Wallace is living in her household.
I believe I found David in 1910 in TXHARTLEYEASTERN GEOGRAPHICAL DIVN.Heritage Quest has him index as Daniel because the census is hard the read this guy is divorced and in his household is son Audra and Audra's wife whose I can read very well but believe to say Laura. The David is listed as born KY and Audra as born MO.
The following may be your Raymond. Father listed b. KY Mother b. MO. ALLEN RAYMOND 20M WMOIAPOLK 7-WD; DES MOINES 1920