Question: What is the population of one of the towns that Watervliet previously encompassed?
Sentence (from "Watervliet (town), New York"): The town of Watervliet ( or ) was a town that at its height encompassed most of present-day Albany County and most of the current town of Niskayuna in neighboring Schenectady County, in the state of New York, United States.
Relevant evidence: No