No people of color were counted at all. There were 40 names on the page, and the total counted was 40. (I counted all the names myself, just to be sure.) The white Pollard family enumerated that year matched the same family I found for 1850 -- and seem to match that of a white John W Pollard who surrendered at the end of the War, having fought on the Confederate side.
From a reliable informant it would seem that prior to the War they did not count the enslaved at all, or simply noted them as 3 females, 1 child, etc. under the name of the enslaver (in the way they would note 20 head of horses, and 45 head of cattle).
Found a book on googlebooks where it states "according to information compiled by Fritz's older brother Luther . . . John William Pollard's ancestors were Virginia slaves. In the last year of the Revolutionary War they were freed, and John Pollard's grandparents and parents became black yeoman farmers in Culpeper County, Virginia. John Pollard was born there in a free Negro community in 1846. . . Fritz Pollard later recalled that when his father was mustered out of the Union army, "he knew the angles and was mixed up with some pretty wealthy men". Returning to Leavenworth, John Pollard learned the barber trade from a white man also named Pollard, and completed what education he was able to obtain. He studied at a school organized by Hiram Revels and Blanche K. Bruce, who would later become the nation's first two black U.S. Senators and represent Mississippi during Reconstruction . . . in Mexico Pollard met Catherine Amanda Hughes, who had come to the Missouri frontier town to further her own education. Little is known of the Hughes family except that Amanda was born in Paris, Missouri, in 1856 and that her mother was of mixed Negro and Indian blood and her father was a white man, probably of French descent. Amanda, who was light-skinned, completed her education and was soon being courted by John Pollard. They married in 1874 . . . "
How much of that is truth, and how much is wishful thinking/family legend, or a mix of the two, only the John and Amanda really knew, and they can no longer tell us.
So our question them becomes, what do WE need to believe -- these family based stories where John W was born a free Black, or the Library of Congress records (and others) that say he was an "escaped (or runaway) slave".