Montpelier is a city in Harrison Township, Blackford County, in the U.S. state of Indiana. This small rural community, the county's first to be platted, was established by settlers from Vermont, and is named after Vermont's capital city of Montpelier. Montpelier was a central participant in the Indiana Gas Boom, as natural gas was discovered near the community in 1887. More importantly, the county's first successful oil well was drilled on the south side of Montpelier in 1890.