2.7 km || |-id=620 bgcolor=#E9E9E9 | 21620 || 1999 KU || — || May 16, 1999 || Catalina || CSS || — || align=right | 6.1 km || |-id=621 bgcolor=#fefefe | 21621 Sherman || || || May 20, 1999 || Socorro || LINEAR || — || align=right | 8.1 km || |-id=622 bgcolor=#fefefe | 21622 Victorshia || || || June 9, 1999 || Socorro || LINEAR || — || align=right | 2.7 km || |-id=623 bgcolor=#fefefe | 21623 Albertshieh || || || June 9, 1999 || Socorro || LINEAR || — || align=right | 3.8 km || |-id=624 bgcolor=#E9E9E9 | 21624 || || — || July 11, 1999 || Višnjan Observatory || K. Korlević || — || align=right | 9.3 km || |-id=625 bgcolor=#d6d6d6 | 21625 Seira || || || July 12, 1999 || Socorro || LINEAR || TIR || align=right | 3.9 km || |-id=626 bgcolor=#fefefe | 21626 Matthewhall || || || July 12, 1999 || Socorro || LINEAR || FLO || align=right | 3.2 km || |-id=627 bgcolor=#E9E9E9 | 21627 Sillis || || || July 13, 1999 || Socorro || LINEAR || — || align=right | 7.6 km || |-id=628 bgcolor=#fefefe | 21628 Lucashof || || || July 13, 1999 || Socorro || LINEAR || MAS || align=right | 2.1 km || |-id=629 bgcolor=#fefefe | 21629 Siperstein || || || July 13, 1999 || Socorro || LINEAR || — || align=right | 2.5 km || |-id=630 bgcolor=#fefefe | 21630 Wootensmith || || || July 13, 1999 || Socorro || LINEAR || — || align=right | 3.0 km || |-id=631 bgcolor=#fefefe | 21631 Stephenhonan || || || July 13, 1999 || Socorro || LINEAR || — || align=right | 2.7 km || |-id=632 bgcolor=#fefefe | 21632 Suwanasri || || || July 13, 1999 || Socorro || LINEAR || — || align=right | 8.3 km || |-id=633 bgcolor=#fefefe | 21633 Hsingpenyuan || || || July 13, 1999 || Socorro || LINEAR || V || align=right | 3.5 km || |-id=634 bgcolor=#fefefe | 21634 Huangweikang || || || July 14, 1999 || Socorro || LINEAR || FLO || align=right | 3.3 km || |-id=635 bgcolor=#fefefe | 21635 Micahtoll || || || July 14, 1999 || Socorro || LINEAR || NYS || align=right | 2.2 km || |-id=636 bgcolor=#fefefe | 21636 Huertas || || || July 14, 1999 || Socorro || LINEAR || — || align=right | 3.3 km || |-id=637 bgcolor=#fefefe