Sedalia, TexasSedalia is a populated place in Collin County, Texas, United States. According to the Handbook of Texas, the community had a population of 25 in 2000. It is located within the Dallas-Fort Worth Metroplex.GeographySedalia is located near the Grayson County line, northwest of Westminster in far-northeastern Collin County. It used to be on FM 3093 before it was combined with Farm to Market Road 3133.EducationToday the community is served by the Anna Independent School District. It is zoned for Judith L. Harlow Elementary School, Anna Middle School, and Anna High School.