[6] According to the United States Census Bureau, the city has a total area of 0.52 square miles (1.35 km2), all land.

[7] Westmoreland is part of the Manhattan, Kansas Metropolitan Statistical Area.

As of the census[8] of 2010, there were 778 people, 301 households, and 192 families residing in the city.

There were 337 housing units at an average density of 648.1 per square mile (250.2/km2).

32.6% of all households were made up of individuals, and 17.3% had someone living alone who was 65 years of age or older.

As of the census[9] of 2000, there were 631 people, 262 households, and 171 families residing in the city.

There were 293 housing units at an average density of 557.6 per square mile (215.3/km2).

30.9% of all households were made up of individuals, and 18.3% had someone living alone who was 65 years of age or older.