Light pollution is unavoidable around most 'civilized' places. I know of a very few accessible good dark locales out West. One is near the Mt Davis observatory in west Texas, a couple hundred miles SE of El Paso -- but I haven't been there. I also haven't been to the Zona del Silencio around the juncture of the Chihuahua-Durango-Coahuila borders, a couple hundred miles SE of Chuhuahua city. This Zone of Silence is also dark to radio-TV signals. Leave your cellphone off.
I *have* been to lovely Portal, Arizona, a bit over 100 miles east of Tucson, just beyond Chiricahua NatMon. Many homes there (rentals too) include small observatories. I hear that the Ft Davis area is similar. And if you don't mind driving 30 miles of bad road (each way!) haul your telescope to Chaco Canyon NatPark in northwest New Mexico, about 100 miles NW of Albuquerque. Be there at New Moon time for telescope parties! (Not recommended in mid-winter.)
Without traveling, I guess the best option for urban stargazing is during a major power outage. Right. #8-)