Union Bridge is a town in Carroll County, Maryland, United States.

[6] The primary method of travel to and from Union Bridge is by road.

The only primary highway serving the town is Maryland Route 75, which follows Green Valley Road and Main Street through Union Bridge.

From Union Bridge, MD 75 connects southward to Libertytown and New Market, and turns eastward to New Windsor.

There were 429 housing units at an average density of 412.5 per square mile (159.3/km2).

29.7% of all households were made up of individuals, and 14.7% had someone living alone who was 65 years of age or older.

22.8% of all households were made up of individuals, and 7.8% had someone living alone who was 65 years of age or older.