Manhattan, KS: how dark is the sky here?
Manhattan reads as suburban on this dataset's scale. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. That's brighter than 54.4% of the 3,206 US cities in this dataset.
This comes from a satellite measuring light radiating upward, not a person's eyes on the ground, so it isn't the same as a Bortle class, though the two track each other closely.
The nearest darker sky to Manhattan
The closest place in this dataset with a meaningfully darker sky is Junction City, KS, roughly 17 miles away in a straight line, rated suburban edge. Road distance will be more.
Junction City, KS is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Manhattan compares nationally
About 54,700 people live in Manhattan, KS, sized enough to appear in this dataset of 3,206 incorporated US cities. Manhattan places 1,735 of 3,206 cities in this dataset's darkest-to-brightest order.