Eldersburg is an unincorporated community and census-designated place (CDP) in Carroll County, Maryland, United States.

[2] Eldersburg is named after John Elder, who was given a land grant from the King of England.

[3] The community was served by a post office in April 1850 in the Howard district of Anne Arundel County with the name "Eldersburgh."

[4][5] The Moses Brown House was listed on the National Register of Historic Places in 1980.

According to the 2000 Census, there were 9,138 households, of which 44.1% included children under the age of 18, 72.2% were married couples, 7.1% were single females, and 17.9% were non-families.

As of 2000, the ancestry of Eldersburg's residents was 24% German, 18% Irish, 13% English, 8% Italian, 5% Polish, 3% Black or African-American, 2% French, 2% Scottish and 2% Dutch.

People of Scotch-Irish, Swedish, Greek, Welsh, Russian, Hungarian, Slovak and Lithuanian descent each comprised 1% of the population.

[12] The Chabad Jewish Center of Carroll County, an Orthodox synagogue, was founded in Eldersburg in 2013.

Beginning in 1996, Beth Shalom was operating the only Jewish school in Carroll County.

The Carroll Transit System runs the South Carroll TrailBlazer (Red Route), which links Eldersburg to Sykesville,[16] as well as the Eldersburg-Westminster TrailBlazer (Blue Route) which links Eldersburg to Westminster.