1999 || Socorro || LINEAR || — || align=right | 3.7 km || |-id=633 bgcolor=#d6d6d6 | 20633 || || — || October 2, 1999 || Socorro || LINEAR || — || align=right | 6.7 km || |-id=634 bgcolor=#fefefe | 20634 Marichardson || || || October 2, 1999 || Socorro || LINEAR || — || align=right | 2.9 km || |-id=635 bgcolor=#d6d6d6 | 20635 || || — || October 2, 1999 || Socorro || LINEAR || ALA || align=right | 24 km || |-id=636 bgcolor=#E9E9E9 | 20636 || || — || October 2, 1999 || Socorro || LINEAR || — || align=right | 4.3 km || |-id=637 bgcolor=#fefefe | 20637 || || — || October 3, 1999 || Socorro || LINEAR || — || align=right | 3.3 km || |-id=638 bgcolor=#E9E9E9 | 20638 Lingchen || || || October 4, 1999 || Socorro || LINEAR || PAD || align=right | 8.1 km || |-id=639 bgcolor=#E9E9E9 | 20639 Michellouie || || || October 4, 1999 || Socorro || LINEAR || — || align=right | 4.0 km || |-id=640 bgcolor=#d6d6d6 | 20640 || || — || October 4, 1999 || Socorro || LINEAR || 3:2 || align=right | 14 km || |-id=641 bgcolor=#d6d6d6 | 20641 Yenuanchen || || || October 4, 1999 || Socorro || LINEAR || — || align=right | 8.2 km || |-id=642 bgcolor=#d6d6d6 | 20642 Laurajohnson || || || October 4, 1999 || Socorro || LINEAR || HYG || align=right | 7.3 km || |-id=643 bgcolor=#fefefe | 20643 Angelicaliu || || || October 7, 1999 || Socorro || LINEAR || NYS || align=right | 5.5 km || |-id=644 bgcolor=#E9E9E9 | 20644 Amritdas || || || October 7, 1999 || Socorro || LINEAR || — || align=right | 4.0 km || |-id=645 bgcolor=#d6d6d6 | 20645 || || — || October 7, 1999 || Socorro || LINEAR || — || align=right | 13 km || |-id=646 bgcolor=#d6d6d6 | 20646 Nikhilgupta || || || October 7, 1999 || Socorro || LINEAR || — || align=right | 5.9 km || |-id=647 bgcolor=#E9E9E9 | 20647 || || — || October 7, 1999 || Socorro || LINEAR || — || align=right | 5.1 km || |-id=648 bgcolor=#d6d6d6 | 20648 || || — || October 10, 1999 || Socorro || LINEAR || — || align=right | 9.7 km || |-id=649 bgcolor=#d6d6d6 | 20649 Miklenov || || || October 10, 1999 || Socorro || LINEAR || KOR || align=right