Carlstadt is a town located in the New Jersey region of the United States. During the most recent census, Carlstadt had a population of 6,127. Carlstadt is the 269th most poplulated city in the New Jersey region, the 5,548th most populated city in the United States and the 27,129th most populated city in the world. Carlstadt is in the America/New York timezone which is 4 hours behind UTC. Carlstadt adjusts the hour with daylight savings time during the winter months.