On 07/29/12 08:56, arcata wrote: > I am mapping U.S. state counties in individual states maps, e.g. A map of > Montana, with county lines. > How do I fill specific counties with a different color? > Do you mean something like: m <- map("county", "Montana") map("county", m$names[c(1, 4)], fill=TRUE, col=c(3, 2), add=TRUE) Ray