Emphasis. The colon can be used to emphasize a phrase or single word at the end of a sentence. An em dash can be used for the same purpose. In the second example below, an em dash is more common than a colon, though the use of a colon is nevertheless correct.
Lawrenceville, GA Income and Careers. As of 2010-2014, the per capita income of Lawrenceville is $19,178, which is lower than the state average of $25,427 and is lower than the national average of $28,555. Lawrenceville median household income is $42,459, which has shrunk by 1.94% since 2000.
Income by Location Options. Here we can see the census tracts in Danielsville, GA colored by the median income for that census tract. Poverty by Age and Gender Options. 13.7% of the population for whom poverty status is determined in Danielsville, GA (912 people) live below the poverty line.