Did you know that the population of Monocacy Station City, Maryland is growing at a rate of more than one percent each year? The population of Monocacy Station City has more than two thousand residents, making it one of the fastest-growing cities in the state. This city is located south of Frederick, Maryland. In the 2017 census, the population of Monocacy Station City was approximately 6,800. This number would be about $2.97 million in 2017 dollars.