Knowth 3 is a small site located south of Site 1. It was about 11 meters in diameter and had a short undifferentiated chamber with no evidence of a passage. The chamber seems to be oriented to the notht west and measured 3.5 m x 1 m. A cremation with a decorated burnt bone or antler object was found near the chamber, along with some shards of coarse pottery and some irregular lumps of chalk.
The mound, which was mostly destroyed at the time of excavation, was built in stratified layers like the larger cairns of Newgrange and Knowth. There are 10 of the original kerbstones in place, all found around the north side of the cairn. Engraved spirals were found on only one stone, a kerbstone on the northeast side of the site (above).
Site 4 at Knowth was rediscovered during the excavations; nothing visible remained on the surface. This site was sizeable at about 17 meters in diameter with an undifferentiated passage and chamber about 8 meters long.
Some 20 sockets showed where the kerbstones had stood, some of which contained packing stones which would have been used to keep the top of the kerb level. There were six settings or arcs of stone laid out on the old ground level, similar to those found at Carrowmore Circle 1 and Circle 27. Some ten kerbstones were found, only three of which remained in their original positions.
The passage was divided by sillstones, and the innermost sill was unusually high, and decorated on both sides and on the top (illustrated above). It was the only engraved stone found within the chamber. A large circular setting was found outside the entrance. It measured more than 2 meters in diameter and was paved with quartz and surrounded by two concentric rings of smaller stones.
The passage appears to be aligned to the northeast, and may mark a rising lunar standstill. The picture below is from George Eogan and shows the site during the excvation.
Knowth 5 was discovered during Professor Eogan's excavations, as no remains of the site were visible on the surface. The site was extensively disturbed by the digging of two ditches. Several large stones, one of which has a simple engraving and a part of a mound were uncovered.
There are nine possible kerbstones, all but two of which had been disturbed. There was no remains of a chamber, but several large flags, which may have been capstones, were found in one of the drains. There were no finds or artifacts recovered.