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.
Estimated median household income in 2013: $58,540 (it was $52,515 in 2000) Estimated per capita income in 2013: $31,808 (it was $29,786 in 2000) Wilsonville city income, earnings, and wages data. Estimated median house or condo value in 2013: $337,755 (it was $213,600 in 2000)