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The total population of Brockton is estimated to be 459 with 263 males (57.30%) and 196 females (42.70%). There are 67 less females than males in Brockton.
The median age in Brockton, MT is 27.6, as per 2021 ACS 5-Year Estimates. Of the total population, 33.70% were under the age of 15, 20.82% aged 15 to 29, 40.55% aged 30 to 64, 4.93% aged 65 to 84, and 0.00% were 85 years of age and older.
Racial distribution of Brockton population: 1.92% are White and 98.08% are American Indian and Alaska Native.