Hello again Donna, I believe I have located Uriah and Esther in 1830 still in Addison Co., VT.I'm not sure why I didn't consider this record previously.
~~1830 Census VT, Addison, Middlebury, Roll M19-184, Page 326 Ancestry.com image 15 of 38 CONVERSE, Alriah Free White Persons - Males - 5 thru 9:1 Free White Persons - Males - 50 thru 59:1 Free White Persons - Females - 15 thru 19:1 Free White Persons - Females - 20 thru 29:3 Free White Persons - Females - 40 thru 49:2 Free White Persons - Under 20:2 Free White Persons - 20 thru 49:5 Total Free White Persons:8 Total - All Persons (Free White, Slaves, Free Colored):8 (My note - No other record of an Alriah/Alria Convers/e on Ancestry except this one.Image is poor quality, appears to read Alriah but I believe this is Uriah. Ages of oldest male and female match Uriah and Esther.)
Still haven't located Uriah in 1840.Perhaps they were moving during that census time.I know there was a serious depression in the mid-1830's and land values plummeted, banks failed etc. and this economic crisis sent many families moving westward.Perhaps this was the impetus that caused Uriah and Esther to leave Vermont.
Also, did you know that Uriah and Esther were second cousins?Their mothers were cousins through the Lambs.Esther's grandmother was Elizabeth Lamb who married Jonathan Stone.Elizabeth's brother was Jonathan Lamb, father of Ruth Lamb who married Luke Converse.