I wouldn't append anything with "CDP". If there's a city and a CDP, append the CDP with the county name like anything else. Most people don't know or care that Harahan is a city and Elmwood is a CDP, they just know when they need to get to somewhere within them.
I'm also curious as to how the search results would turn out for the smaller of a pair of cities. Say the state of Powhatan has a couple towns called Newport, one in Jefferson County population 6,000 and one in Washington County population 2,000. The first is bigger, but by no means a major city. If we name the first "Newport" and the second "Newport, Washington", will a search for "200 main st, newport po" return just the 200 Main St in the first Newport? Or would it work better if the names were better balanced, "Newport, Jefferson" and "Newport, Washington"?
I also think it would look better and less confusing if it were formatted "City (County)" instead of with a comma.
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