LIST OF ASTEROIDS/21801–21900

|-
| 21801 Ančerl || || October 2, 1999 || Ondřejov || L. Šarounová
|-
| 21802 Svoreň || || October 6, 1999 || Modra || L. Kornoš, J. Tóth
|-
| 21803 - || || October 6, 1999 || Višnjan Observatory || K. Korlević, M. Jurić
|-
| 21804 Václavneumann || || October 4, 1999 || Ondřejov || L. Šarounová
|-
| 21805 - || || October 8, 1999 || Višnjan Observatory || K. Korlević, M. Jurić
|-
| 21806 - || || October 10, 1999 || Višnjan Observatory || K. Korlević, M. Jurić
|-
| 21807 - || || October 10, 1999 || Višnjan Observatory || K. Korlević, M. Jurić
|-
| 21808 - || || October 14, 1999 || Xinglong || Beijing Schmidt CCD Asteroid Program
|-
| 21809 - || || October 15, 1999 || High Point || D. K. Chesney
|-
| 21810 - || || October 9, 1999 || Uto || F. Uto
|-
| 21811 Burroughs || || October 5, 1999 || Goodricke-Pigott || R. A. Tucker
|-
| 21812 - || || October 3, 1999 || Kitt Peak || Spacewatch
|-
| 21813 Danwinegar || || October 3, 1999 || Socorro || LINEAR
|-
| 21814 Shanawolff || || October 3, 1999 || Socorro || LINEAR
|-
| 21815 Fanyang || || October 4, 1999 || Socorro || LINEAR
|-
| 21816 - || || October 4, 1999 || Socorro || LINEAR
|-
| 21817 Yingling || || October 4, 1999 || Socorro || LINEAR
|-
| 21818 Yurkanin || || October 4, 1999 || Socorro || LINEAR
|-
| 21819 - || || October 4, 1999 || Socorro || LINEAR
|-
| 21820 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21821 - || || October 12, 1999 || Anderson Mesa || LONEOS
|-
| 21822 - || || October 15, 1999 || Anderson Mesa || LONEOS
|-
| 21823 - || || October 9, 1999 || Kitt Peak || Spacewatch
|-
| 21824 - || || October 10, 1999 || Kitt Peak || Spacewatch
|-
| 21825 Zhangyizhong || || October 2, 1999 || Socorro || LINEAR
|-
| 21826 Youjiazhong || || October 2, 1999 || Socorro || LINEAR
|-
| 21827 Chingzhu || || October 2, 1999 || Socorro || LINEAR
|-
| 21828 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21829 Kaylacornale || || October 2, 1999 || Socorro || LINEAR
|-
| 21830 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21831 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21832 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21833 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21834 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21835 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21836 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21837 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21838 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21839 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21840 Ghoshchoudhury || || October 2, 1999 || Socorro || LINEAR
|-
| 21841 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21842 - || || October 2, 1999 || Socorro || LINEAR
|-
| 21843 - || || October 3, 1999 || Socorro || LINEAR
|-
| 21844 - || || October 4, 1999 || Socorro || LINEAR
|-
| 21845 - || || October 4, 1999 || Socorro || LINEAR
|-
| 21846 Wojakowski || || October 4, 1999 || Socorro || LINEAR
|-
| 21847 - || || October 4, 1999 || Socorro || LINEAR
|-
| 21848 - || || October 4, 1999 || Socorro || LINEAR
|-
| 21849 - || || October 6, 1999 || Socorro || LINEAR
|-
| 21850 Abshir || || October 7, 1999 || Socorro || LINEAR
|-
| 21851 - || || October 7, 1999 || Socorro || LINEAR
|-
| 21852 Bolander || || October 7, 1999 || Socorro || LINEAR
|-
| 21853 Kelseykay || || October 7, 1999 || Socorro || LINEAR
|-
| 21854 Brendandwyer || || October 7, 1999 || Socorro || LINEAR
|-
| 21855 - || || October 7, 1999 || Socorro || LINEAR
|-
| 21856 Heathermaria || || October 7, 1999 || Socorro || LINEAR
|-
| 21857 - || || October 7, 1999 || Socorro || LINEAR
|-
| 21858 Gosal || || October 7, 1999 || Socorro || LINEAR
|-
| 21859 - || || October 10, 1999 || Socorro || LINEAR
|-
| 21860 Joannaguy || || October 10, 1999 || Socorro || LINEAR
|-
| 21861 Maryhedberg || || October 12, 1999 || Socorro || LINEAR
|-
| 21862 Joshuajones || || October 12, 1999 || Socorro || LINEAR
|-
| 21863 - || || October 12, 1999 || Socorro || LINEAR
|-
| 21864 - || || October 4, 1999 || Catalina || CSS
|-
| 21865 - || || October 8, 1999 || Catalina || CSS
|-
| 21866 - || || October 8, 1999 || Catalina || CSS
|-
| 21867 - || || October 9, 1999 || Socorro || LINEAR
|-
| 21868 - || || October 10, 1999 || Socorro || LINEAR
|-
| 21869 - || || October 1, 1999 || Catalina || CSS
|-
| 21870 - || || October 16, 1999 || Višnjan Observatory || K. Korlević
|-
| 21871 - || || October 17, 1999 || Višnjan Observatory || K. Korlević
|-
| 21872 - || || October 18, 1999 || Xinglong || Beijing Schmidt CCD Asteroid Program
|-
| 21873 Jindřichůvhradec || || October 29, 1999 || Kleť || J. Tichá, M. Tichý
|-
| 21874 - || || October 18, 1999 || Xinglong || Beijing Schmidt CCD Asteroid Program
|-
| 21875 - || || October 22, 1999 || Xinglong || Beijing Schmidt CCD Asteroid Program
|-
| 21876 - || || October 29, 1999 || Catalina || CSS
|-
| 21877 - || || October 31, 1999 || Kitt Peak || Spacewatch
|-
| 21878 - || || October 29, 1999 || Catalina || CSS
|-
| 21879 - || || October 29, 1999 || Catalina || CSS
|-
| 21880 - || || October 29, 1999 || Catalina || CSS
|-
| 21881 - || || October 29, 1999 || Catalina || CSS
|-
| 21882 - || || October 29, 1999 || Catalina || CSS
|-
| 21883 - || || October 28, 1999 || Catalina || CSS
|-
| 21884 - || || October 30, 1999 || Catalina || CSS
|-
| 21885 - || || October 30, 1999 || Kitt Peak || Spacewatch
|-
| 21886 - || || October 31, 1999 || Kitt Peak || Spacewatch
|-
| 21887 - || || October 20, 1999 || Anderson Mesa || LONEOS
|-
| 21888 - || || October 29, 1999 || Anderson Mesa || LONEOS
|-
| 21889 - || || October 29, 1999 || Kitt Peak || Spacewatch
|-
| 21890 - || || October 30, 1999 || Catalina || CSS
|-
| 21891 - || || November 1, 1999 || Monte Agliale || S. Donati
|-
| 21892 - || || November 1, 1999 || Kitt Peak || Spacewatch
|-
| 21893 - || || November 1, 1999 || Catalina || CSS
|-
| 21894 - || || November 1, 1999 || Catalina || CSS
|-
| 21895 - || || November 5, 1999 || Višnjan Observatory || K. Korlević
|-
| 21896 - || || November 7, 1999 || Oohira || T. Urata
|-
| 21897 - || || November 7, 1999 || Višnjan Observatory || K. Korlević
|-
| 21898 - || || November 7, 1999 || Višnjan Observatory || K. Korlević
|-
| 21899 - || || November 8, 1999 || Fountain Hills || C. W. Juels
|-
| 21900 - || || November 9, 1999 || Oizumi || T. Kobayashi
|-