Dimensions: 18' 6" x 18' 0"; ceiling 17' 9" (shown from perspective of Tea Room)
Color: Originally unpainted plaster, then "chrome yellow," then wall-papered, then blue in the post-Jefferson era. Currently the walls are a "chrome yellow" recreated following paint analysis studies.
Purpose of Room: Dining area
Architectural features: Two sets of window sashes insulate room; double pocket doors on rollers separate the Dining Room from the western-most, and coldest, Tea Room; the Dining Room features one of Monticello's thirteen skylights; wine dumbwaiter on either side of fireplace brought wine up from cellar below; serving door with shelves enabled slaves to move dishes in and out of the room more easily and with fewer intrusions to diners; Wedgwood decoration on fireplace
1802 September 18. (Mrs. William Thornton). "We went thro' a large unfinished hall, loose plank forming the floor, lighted by one dull lantern, into a large room with a small bow and separated by an arch, where the company were seated at tea,-no light being in the large part of the room & part of the family being seated there, the appearance was irregular & unpleasant." 
1812. (Eva Millar-Nourse). "...a French book was always kept on the mantle-piece in the dining room and while waiting for the servants to set the table they would read together." 
1814. (Francis Calley Gray). "On looking round the room n which we sat the first thing which attracted our attention was the state of the chairs. They had leather bottoms stuffed with hair, but the bottoms were completely worn through and the hair sticking out in all directions; on the mantle-piece which was large and of marble were many books of all kinds, Livy, Orosious, Edinburgh Review, 1 vol. of Edgeworth's Moral Tales, etc., etc. There were many miserable prints and some fine pictures hung round the room among them two plans for the completion of the Capitol at Washington, one of them very elegant. A harpsichord stood in one corner of the room. There were four double windows from the wall to the floor of fine large glass and a recess in one side o the apartment..." 
1826. (Elizabeth Lindsay Gordon). "She said she had observed that there was always a volume of some sort on the mantle shelf of the dining-room at Monticello, from which, whenever she entered the room at meal times, she almost always found him reading, while he stood near the fire-place, waiting for family and guests to assemble." 
1827 July 29. (Mary Jefferson Randolph to Ellen Wayles Randolph Coolidge). "One plan that Virginia has suggested...live entirely on the first floor which might be made to accommodate us but would not admit of guests...we might use the dining room as a bedroom & breakfast and dine in the hall..."