Currently reporting:
KJYO LEESBURG/GODFREY distance: 4.54 miles. WNW
@ 2020-09-21  09:15 UTC,
     KJYO 210915Z AUTO 01004KT 10SM CLR 06/04 A3055 RMK AO2
KIAD WASH DC/DULLES distance: 7.89 miles. SSE
@ 2020-09-21  08:52 UTC,
     KIAD 210852Z 33004KT 10SM CLR 07/04 A3053 RMK AO2 SLP337 T00670039 55001 $
KGAI GAITHERSBURG distance: 19.18 miles. ENE
@ 2020-09-21  08:56 UTC,
     KGAI 210856Z AUTO 00000KT 10SM CLR 04/03 A3053 RMK AO2 SLP355 T00440033 55002
KHEF MANASSAS MUNI distance: 22.66 miles. S
@ 2020-09-21  08:56 UTC,
     KHEF 210856Z AUTO 36003KT 10SM CLR 06/04 A3053 RMK AO2 SLP343 6//// T00610044 55004 PNO $
KFDK FREDERICK distance: 26.56 miles. NNE
@ 2020-09-21  09:15 UTC,
     KFDK 210915Z AUTO 00000KT 10SM CLR 03/02 A3055 RMK AO2
KDCA WASHINGTON/NATL distance: 27.83 miles. ESE
@ 2020-09-21  08:52 UTC,
     KDCA 210852Z 34006KT 10SM FEW250 10/06 A3052 RMK AO2 SLP336 T01000061 58003
KDAA FORT BELVOIR/DAV distance: 28.43 miles. SE
@ 2020-09-21  08:56 UTC,
     KDAA 210856Z AUTO 00000KT 10SM CLR 07/05 A3051 RMK AO2 SLP335 T00680053 56004 $
KCGS COLLEGE PARK distance: 30.92 miles. E
@ 2020-09-21  09:15 UTC,
     KCGS 210915Z AUTO 00000KT 10SM CLR 06/04 A3052 RMK AO1 T00620041
KHWY WARRENTON distance: 34.12 miles. SSW
@ 2020-09-21  09:15 UTC,
     KHWY 210915Z AUTO 00000KT 10SM CLR 03/01 A3051 RMK AO2 T00250012
KOKV WINCHESTER RGNL distance: 36.07 miles. W
@ 2020-09-21  09:15 UTC,
     KOKV 210915Z AUTO 00000KT 10SM CLR 02/02 A3052 RMK AO2
KMRB MARTINSBURG distance: 36.2 miles. NW
@ 2020-09-21  08:53 UTC,
     KMRB 210853Z AUTO 00000KT 10SM CLR 04/01 A3053 RMK AO2 SLP341 T00440011 53001
KADW ANDREWS AFB distance: 36.87 miles. ESE
@ 2020-09-21  08:56 UTC,
     KADW 210856Z AUTO 01006KT 10SM CLR 06/04 A3050 RMK AO2 SLP336 T00630043 56003 FZRANO $
KFME FORT MEADE distance: 38.76 miles. E
@ 2020-09-21  09:15 UTC,
     KFME 210915Z AUTO 00000KT 10SM CLR 04/04 A3055 RMK AO1
KNYG QUANTICO MCAF distance: 38.9 miles. SSE
@ 2020-09-21  08:56 UTC,
     KNYG 210856Z AUTO 29008KT 10SM CLR 08/ A3052 RMK AO2 SLP336 T0083 55004 $
KCJR CULPEPER distance: 40.76 miles. SSW
@ 2020-09-21  09:15 UTC,
     KCJR 210915Z AUTO 01003KT 10SM CLR 06/05 A3053 RMK AO2 T00560049
KFRR FRONT ROYAL distance: 41.89 miles. WSW
@ 2020-09-21  09:15 UTC,
     KFRR 210915Z AUTO 00000KT 10SM CLR A3053 RMK AO1
KBWI BALTO/WASH INTL distance: 43.94 miles. ENE
@ 2020-09-21  08:54 UTC,
     KBWI 210854Z 30003KT 10SM CLR 06/03 A3052 RMK AO2 SLP334 T00610033 55002
KRMN STAFFORD REGNL distance: 44.53 miles. S
@ 2020-09-21  09:15 UTC,
     KRMN 210915Z AUTO 33006KT 10SM CLR 07/07 A3055 RMK AO2 T00670067
KDMW CARROLL CNTY distance: 46.43 miles. NNE
@ 2020-09-21  09:15 UTC,
     KDMW 210915Z AUTO 00000KT 10SM CLR 06/02 A3053 RMK AO2
KHGR HAGERSTOWN distance: 47.2 miles. NNW
@ 2020-09-21  08:53 UTC,
     KHGR 210853Z AUTO 00000KT 10SM CLR 08/01 A3054 RMK AO2 SLP351 T00830006 58000 TSNO

Not current (maybe part-time, military or newly obsolete)
KW32 CLINTON distance: 36.05 miles. SE
KRSP NSF THURMONT distance: 41.9 miles. N
KJWX FORT RITCHIE distance: 46.64 miles. N
KRYT FOUNTAIN DALE distance: 47.73 miles. N
KDMH BALTIMORE/DWNTWN distance: 49.49 miles. ENE