21670 Kuan || || || September 7, 1999 || Socorro || LINEAR || — || align=right | 2.8 km || |-id=671 bgcolor=#E9E9E9 | 21671 Warrener || || || September 7, 1999 || Socorro || LINEAR || MAR || align=right | 4.2 km || |-id=672 bgcolor=#E9E9E9 | 21672 Laichunju || || || September 7, 1999 || Socorro || LINEAR || RAF || align=right | 3.8 km || |-id=673 bgcolor=#fefefe | 21673 Leatherman || || || September 7, 1999 || Socorro || LINEAR || V || align=right | 2.2 km || |-id=674 bgcolor=#E9E9E9 | 21674 Renaldowebb || || || September 7, 1999 || Socorro || LINEAR || MAR || align=right | 4.1 km || |-id=675 bgcolor=#fefefe | 21675 Kaitlinmaria || || || September 7, 1999 || Socorro || LINEAR || — || align=right | 2.6 km || |-id=676 bgcolor=#d6d6d6 | 21676 Maureenanne || || || September 7, 1999 || Socorro || LINEAR || — || align=right | 11 km || |-id=677 bgcolor=#E9E9E9 | 21677 Tylerlyon || || || September 7, 1999 || Socorro || LINEAR || — || align=right | 2.8 km || |-id=678 bgcolor=#E9E9E9 | 21678 Lindner || || || September 5, 1999 || Drebach || G. Lehmann, J. Kandler || — || align=right | 3.7 km || |-id=679 bgcolor=#fefefe | 21679 Bettypalermiti || || || September 8, 1999 || Fountain Hills || C. W. Juels || — || align=right | 2.9 km || |-id=680 bgcolor=#E9E9E9 | 21680 Richardschwartz || || || September 9, 1999 || Farra d'Isonzo || Farra d'Isonzo || PAD || align=right | 6.5 km || |-id=681 bgcolor=#d6d6d6 | 21681 || || — || September 9, 1999 || Višnjan Observatory || K. Korlević || VER || align=right | 8.5 km || |-id=682 bgcolor=#fefefe | 21682 Peštafrantišek || || || September 9, 1999 || Ondřejov || P. Pravec, P. Kušnirák || — || align=right | 3.5 km || |-id=683 bgcolor=#fefefe | 21683 Segal || || || September 9, 1999 || Fountain Hills || C. W. Juels || FLO || align=right | 4.3 km || |-id=684 bgcolor=#fefefe | 21684 Alinafiocca || || || September 4, 1999 || Anza || M. White, M. Collins || — || align=right | 2.7 km || |-id=685 bgcolor=#d6d6d6 | 21685 Francomallia || || || September 11, 1999 || Ceccano || G. Masi || KOR || align=right | 4.3 km || |-id=686 bgcolor=#fefefe | 21686 Koschny || || || September 11, 1999 || Drebach || A.