Southwest Greensburg is a borough in Westmoreland County, Pennsylvania. It surrounds Greensburg, a lively and highly populated small city.

According to the United States Census Bureau of 2000, Southwest Greensburg is home to more than 2,400 residents. The borough has a total area of 0.4 square miles with a high population density of over 6,000 people per square mile.

The racial composition of Southwest Greensburg is 96.62% White, 1.75% African American, 0.13% Native American, 0.17% Asian, 0.04% Pacific Islander, 0.38% from other races, and 0.92% from two or more races. Hispanic or Latino of any race are 0.46% of the population.

Southwest Greensburg has more than 1,000 households. The median income for a household in the borough is $35,750, and the median income for a family is $43,929.