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.
Real Median Household Income for Montgomery Alabama. Trends in Montgomery, AL Real Median Household Income since 2005. The current median household income for Montgomery is $45,636. Real median household income peaked in 2008 at $51,104 and is now $5,468 (10.70%) lower.