New Florence is a borough that is located in Westmoreland County, Pennsylvania, United States. The population was 689 as of the 2010 census, which is a decrease from the total of 784 that was recorded by the 2000 census.

Westmoreland County is a county in the Commonwealth of Pennsylvania, United States, located in the Pittsburgh Metropolitan Statistical Area. As of the 2020 census, the population was 354,663. The county seat is Greensburg and the most populous community is Hempfield Township. It is named after Westmorland, a historic county of England. The county is part of the Southwest Pennsylvania region of the state.