| Cupillari Observatory | Pensilvania | — |
 Custer Observatory | Nueva York | — |
 CWU Observatory | Ellensburg | — |
 CWU-Lind Observatory | Ellensburg | — |
| Dan Zowada Memorial Observatory | — | — |
 Daniel S. Schanck Observatory | Nuevo Brunswick | — |
| Daniel Scholl Observatory | — | — |
| Dark Rosanne observatory | Middlefield | — |
| Dark Sky New Mexico observatory | New Mexico | — |
| Dark Sky Observatory | Carolina del Norte | — |
| Dark Sky Observatory | Carolina del Norte | — |
| Darling's Observatory | Duluth | — |
 David Cole Observatory | Massachusetts | — |
| Deadhorse Magnetic Observatory | — | — |
 Dearborn Observatory | Evanston | 195 m |
| Deep Sky Observatory Collaborative | Fort Davis | — |
| Deep Sky West Observatory | Young Place | — |
 Deep Space Climate Observatory | — | — |
| Deep Synoptic Array | condado de White Pine | — |
| Deerlick Observatory | Sharon | — |
| DeKalb Observatory | Auburn | — |
| Del Rio Magnetic Observatory | — | — |
| Desert Beaver Observatory | Arizona | 261 m |
| Desert Moon Observatory | Las Cruces | — |
| Desert Wanderer observatory | Imperial County | — |
| Dilbert observatory | Forest Grove | — |
| Divine Creation Observatory | Fort Davis | — |
| Doc Greiner Research observatory | Evansville | — |
| Doyan Rose Observatory | Indianápolis | — |
| Drake Municipal Observatory | Iowa | — |
| Drake University observatory | Des Moines | — |
| Drum Hill Station | Chelmsford | — |
 DSS 14 | California | — |
 Earlham College Observatory | Richmond | — |
| Eastern Illinois University observatory | Charleston | — |
| Edmund Kline observatory | Deer Trail | — |
| Edwards Raven Observatory | Estados Unidos | — |
| Elephant Head observatory | East Sahuarita | — |
 Elgin National Watch Company Observatory | Illinois | — |
| Elgin obsevatory | Elgin | — |
 Embry-Riddle Observatory | — | — |
| Emerald Lane Observatory | Alabama | 201 m |
| Emmy Observatory | New Paltz | — |
 Enid High School Observatory | Enid | — |
| Enriched Xenon Observatory | — | — |
| Estación Anderson Mesa | Coconino County | 2.163 m |
| Estación Astronómica Catalina | Pima County | — |
 Etelman Observatory | Islas Vírgenes de los Estados Unidos | — |