Westmoreland is a city in and the county seat of Pottawatomie County, Kansas, United States. As of the 2010 census, the city population was 778. Westmoreland is part of the Manhattan, Kansas Metropolitan Statistical Area.
Westmoreland is located at 39°23′41″N 96°24′51″W / 39.39472°N 96.41417°W / 39.39472; -96.41417 (39.394770, -96.414154). According to the United States Census Bureau, the city has a total area of 0.5 square miles (1.4 km²), all of it land.
As of the census of 2000, there were 631 people, 262 households, and 171 families residing in the city. The population density was 1,200.8 people per square mile (459.7/km²). There were 293 housing units at an average density of 557.6 per square mile (213.4/km²). The racial makeup of the city was 98.42% White, 0.32% Native American, 0.48% from other races, and 0.79% from two or more races. Hispanic or Latino of any race were 1.58% of the population.