Collier Township is a township in Allegheny County, Pennsylvania, United States. The population was 8,931 at the 2020 census, an increase over the figure of 7,080 tabulated in 2010. According to the United States Census Bureau, the township has a total area of 14.2 square miles, of which 14.2 square miles is land and 0.04 square miles is water. The t…Collier Township is a township in Allegheny County, Pennsylvania, United States. The population was 8,931 at the 2020 census, an increase over the figure of 7,080 tabulated in 2010. According to the United States Census Bureau, the township has a total area of 14.2 square miles, of which 14.2 square miles is land and 0.04 square miles is water. The total area comprising water is thus 0.21%.
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