Fort Benton is located at 47°49'10" North, 110°40'11" West (47.819307, -110.669726)GR1.
According to the United States Census Bureau, the city has a total area of 5.4 km² (2.1 mi²). 5.4 km² (2.1 mi²) of it is land and none of it is covered by water.
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