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.
City of Lawrenceville, GA. Lawrenceville is located in Gwinnett County in Georgia. The median income is $43,494 and the median home value is $129,900. The population is 34% White, 33% Black, 7% Asian and 0% Native American or Native Hawaiian. 5% identify as another race or ethnicity, or two or more races.