Currently reporting:
KJYO LEESBURG/GODFREY distance: 4.54 miles. WNW
@ 2020-09-27  05:55 UTC,
     KJYO 270555Z AUTO 00000KT 5SM OVC032 15/15 A3000 RMK AO2
KIAD WASH DC/DULLES distance: 7.89 miles. SSE
@ 2020-09-27  05:52 UTC,
     KIAD 270552Z 32003KT 10SM BKN008 OVC031 19/18 A2998 RMK AO2 SLP149 T01940178 10211 20189 58009 $
KGAI GAITHERSBURG distance: 19.18 miles. ENE
@ 2020-09-27  05:56 UTC,
     KGAI 270556Z AUTO 00000KT 6SM BR FEW016 OVC024 19/18 A2999 RMK AO2 SLP165 60000 T01890178 10189 20183 58012
KHEF MANASSAS MUNI distance: 22.66 miles. S
@ 2020-09-27  05:56 UTC,
     KHEF 270556Z AUTO 00000KT 10SM OVC010 19/18 A2998 RMK AO2 SLP156 T01890183 10206 20183 58007
KFDK FREDERICK distance: 26.56 miles. NNE
@ 2020-09-27  05:55 UTC,
     KFDK 270555Z AUTO 00000KT 3SM BR OVC010 17/16 A2999 RMK AO2
KDCA WASHINGTON/NATL distance: 27.83 miles. ESE
@ 2020-09-27  05:52 UTC,
     KDCA 270552Z 00000KT 2 1/2SM -DZ BR BKN005 OVC020 21/19 A2998 RMK AO2 DZE01B34RAB02E34 SLP150 P0001 60006 T02060194 10217 20200 58009
KDAA FORT BELVOIR/DAV distance: 28.43 miles. SE
@ 2020-09-27  05:56 UTC,
     KDAA 270556Z AUTO 00000KT 4SM BR BKN018 OVC023 19/19 A2997 RMK AO2 SLP151 60002 T01940187 10206 20193 57009 $
KCGS COLLEGE PARK distance: 30.92 miles. E
@ 2020-09-27  05:55 UTC,
     KCGS 270555Z AUTO 00000KT 7SM OVC005 19/18 A2997 RMK AO1 T01900178 10195 20190
KHWY WARRENTON distance: 34.12 miles. SSW
@ 2020-09-27  05:55 UTC,
     KHWY 270555Z AUTO 00000KT 1/2SM FG BKN002 OVC032 16/15 A2998 RMK AO2 T01640149 10208 20161 402300161
KOKV WINCHESTER RGNL distance: 36.07 miles. W
@ 2020-09-27  05:55 UTC,
     KOKV 270555Z AUTO 00000KT 3/4SM BR BKN002 12/12 A2998 RMK AO2
KMRB MARTINSBURG distance: 36.2 miles. NW
@ 2020-09-27  05:53 UTC,
     KMRB 270553Z AUTO 00000KT 10SM OVC008 13/13 A2999 RMK AO2 SLP151 T01330128 10172 20122 58005
KADW ANDREWS AFB distance: 36.87 miles. ESE
@ 2020-09-27  05:56 UTC,
     KADW 270556Z AUTO 00000KT 7SM OVC003 20/20 A2996 RMK AO2 DZB34E43 OVC V BKN CIG 002 RWY19L SLP151 P0000 60000 T01950195 10198 20195 58009 FZRANO $
KFME FORT MEADE distance: 38.76 miles. E
@ 2020-09-27  05:55 UTC,
     KFME 270555Z AUTO 00000KT 1 3/4SM OVC004 18/18 A2999 RMK AO1
KNYG QUANTICO MCAF distance: 38.9 miles. SSE
@ 2020-09-27  05:56 UTC,
     KNYG 270556Z AUTO 28005KT 5SM BR OVC004 19/19 A2998 RMK AO2 SLP153 60001 T01940189 10206 20194 56008
KCJR CULPEPER distance: 40.76 miles. SSW
@ 2020-09-27  05:55 UTC,
     KCJR 270555Z AUTO 00000KT 7SM OVC035 17/16 A3000 RMK AO2 T01670159 10196 20151
KFRR FRONT ROYAL distance: 41.89 miles. WSW
@ 2020-09-27  05:55 UTC,
     KFRR 270555Z AUTO 00000KT 4SM BKN002 13/13 A2999 RMK AO1
KRSP NSF THURMONT distance: 41.9 miles. N
@ 2020-09-27  05:54 UTC,
     KRSP 270554Z AUTO 00000KT 6SM BR BKN029 15/14 A3002 RMK AO2 SLP164 T01500144 10167 20150 56009 PWINO $
KBWI BALTO/WASH INTL distance: 43.94 miles. ENE
@ 2020-09-27  05:54 UTC,
     KBWI 270554Z 00000KT 4SM BR OVC004 21/19 A2996 RMK AO2 SLP145 60001 T02060189 10206 20206 58010
KRMN STAFFORD REGNL distance: 44.53 miles. S
@ 2020-09-27  05:55 UTC,
     KRMN 270555Z AUTO 00000KT 7SM OVC005 19/19 A3002 RMK AO2 T01850185 10197 20174 402180163
KDMW CARROLL CNTY distance: 46.43 miles. NNE
@ 2020-09-27  05:55 UTC,
     KDMW 270555Z AUTO 00000KT 3SM BR OVC003 19/19 A2999 RMK AO2
KHGR HAGERSTOWN distance: 47.2 miles. NNW
@ 2020-09-27  05:53 UTC,
     KHGR 270553Z AUTO 32006KT 1 3/4SM BR BKN001 OVC022 16/16 A3000 RMK AO2 SLP166 T01610156 10211 20150 56002 TSNO

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