The Federal Communications Commission (FCC) has granted a total of 60 licenses and call signs in the category of Restricted Operator license in Columbia, Maryland. Select a call sign from the table below to view its details such as the date of authorization, expiration date, service description, and so forth.
| Call Sign | License Holder Name | Date of Authorization |
|---|---|---|
| RL00018287 | Ruiz Gomez, Nelson M | 2022-11-09 |
| RR00001690 | BA, OUSMANE | 2001-07-19 |
| RR00002175 | ECHE, RAY C | 2001-08-10 |
| RR00002540 | SINGH, GAURAV | 2001-08-24 |
| RR00005294 | Colon, Jose A | 1984-06-08 |
| RR00007097 | Irving, Philip | 2002-07-11 |
| RR00013832 | Alberts, George E | 2003-08-28 |
| RR00018001 | Cotilla III, Federico A | 2004-03-30 |
| RR00018743 | Holt, Christopher D | 2004-04-24 |
| RR00019455 | CRNKOVICH, MICHELLE C | 2004-05-19 |
| RR00020657 | Yacono, David A | 2004-06-30 |
| RR00022569 | Weidner, Austin B | 2004-09-18 |
| | ||
| RR00023864 | Kimberling, Mark S | 2004-11-10 |
| RR00025436 | Almas, Sammy | 2005-01-26 |
| RR00027571 | Jacobs Jr, Frank L | 2005-04-20 |
| RR00031895 | Kupec, Christopher C | 2005-09-30 |
| RR00035851 | RUNDE, PATRICK T | 2006-03-21 |
| RR00037534 | Wagner, Glenn A | 2006-05-26 |
| RR00041995 | Jensen, Peter C | 2006-10-31 |
| RR00043217 | Zerhusen, Janet F | 2006-12-19 |
| RR00043219 | Zerhusen, Henry P | 2006-12-19 |
| RR00047128 | Kim, Peter H | 2007-04-17 |
| RR00048111 | Bechara, Elias N | 2007-05-15 |
| RR00052966 | Alexander Jr, Roberto B | 2007-10-10 |
| RR00053882 | Porterfield, John R | 2007-11-07 |
| RR00056101 | Bezos, David R | 2008-01-26 |
| RR00060300 | Sapp, Michael L | 2008-07-08 |
| RR00065403 | Bythrow, Peter F | 2009-05-12 |
| RR00072127 | flahive, russell a | 2010-06-23 |
| RR00072128 | Tedder, Scott W | 2010-06-23 |
| RR00074424 | Chandler, Frank M | 2010-10-30 |
| RR00098493 | Salvati, Mark | 2013-11-19 |
| RR00098601 | Horn, Charles D | 2013-11-22 |
| RR00104952 | Lewin, Christopher T | 2014-07-30 |
| RR00110566 | Leija, Sergio G | 2015-03-19 |
| RR00113195 | Riel, Andrew N | 2015-07-03 |
| RR00113759 | Tomlinson, Michael A | 2015-07-28 |
| RR00118818 | Dunwiddie, Robert M | 2016-02-12 |
| RR00122465 | DeBoissiere, Kevin W | 2016-06-18 |
| RR00123200 | Roehrig, Aaron L | 2016-07-16 |
| RR00125952 | Ashe, Corbin D | 2016-10-21 |
| RR00131715 | Rosti, Kenneth L | 2017-05-06 |
| RR00132167 | Delgado, Tomas J | 2017-05-20 |
| RR00132168 | Miller, Andrej N | 2017-05-20 |
| RR00140812 | Priest Jr, Parker H | 2018-02-21 |
| RR00140862 | McAndrew, Timothy P | 2018-02-21 |
| RR00141740 | Thorne, Christopher R | 2018-03-20 |
| RR00142329 | Hwang, James W | 2018-04-03 |
| RR00147170 | Ku, Daeyong M | 2018-08-21 |
| RR00153667 | Beachum, Michael K | 2019-03-08 |
| RR00154597 | Murray Mr, Geoffrey D | 2019-04-02 |
| RR00157817 | Solpietro, Michael A | 2019-06-21 |
| RR00160132 | MAESTRE 730, LUIS E | 2019-08-27 |
| RR00170826 | Borchers, Benjamin B | 2020-11-03 |
| RR00172162 | Park, Sewon | 2021-01-26 |
| RR00178686 | Jones, Steven G | 2021-08-10 |
| RR00196254 | Lilly, James D | 2022-09-16 |
| RR00197725 | Gurrister, Matthew D | 2022-10-15 |
| RR00205248 | Ellis Jr, Robert J | 2023-03-21 |
| RR00206598 | Simons, Kingsley J | 2023-04-18 |
