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.
The median income for a household in the city was $23,750, and the median income for a family was $26,765. Males had a median income of $18,886 versus $16,686 for females. The per capita income for the city was $10,720.