Pompeys Pillar, MT is a city located in Yellowstone County, Montana and has a land area of 230.14 square miles (596.06 km2). The water area for the city is 1.66 square miles or 4.30 km2. There is one unique zip code in Pompeys Pillar, Montana and it is 59064. The area code(s) for Pompeys Pillar is 406.
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