Glenfield is a borough in Allegheny County, Pennsylvania, United States, situated along the Ohio River.

As of the 2000 census,[13] there were two hundred and thirty-six people, ninety households, and sixty families in the borough.

There were ninety-six housing units at an average density of 113.4 per square mile (43.8/km2).

30.0% of all households were made up of individuals, and 14.4% had someone living alone who was sixty-five years of age or older.

In the borough the population was spread out, with 30.5% under the age of eighteen, 4.7% from eighteen to twenty-four, 26.3% from twenty-five to forty-four, 21.6% from forty-five to sixty-four, and 16.9% who were sixty-five years of age or older.