Twin Falls, ID's night sky, measured from orbit
Satellite radiance puts Twin Falls in the suburban band. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. That's brighter than 56.6% of the 3,206 US cities in this dataset.
Note the source: a satellite reading of upward light, not a visual Bortle scale reading. The two measure related but different things.
The nearest darker sky to Twin Falls
Chubbuck, ID, about 105 miles away as the crow flies, measures in the suburban edge band, one step darker than Twin Falls. Actual driving distance will run longer than that straight-line figure.
Chubbuck, ID is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Twin Falls compares nationally
About 55,589 people live in Twin Falls, ID, sized enough to appear in this dataset of 3,206 incorporated US cities. Twin Falls places 1,805 of 3,206 cities in this dataset's darkest-to-brightest order.