Using Newspapers.com. I was able to find out that, in addition to WOWO, Ft. Wayne, IN & WCCO, Minneapolis\St. Paul, MN ceasing regular broadcasting for a brief time on the morning on February 20, 1971 due to the false EBS activation, the following radio & TV stations also either briefly ceased programming, or even went off-the-air completely at that time as well (Links to articles are included.):
KGA, Spokane, WA
KJRB, Spokane, WA
KQIN, Burien, WA
KREW, Sunnyside
www.newspapers.com
WVEC-AM & FM, Hampton, VA
WSVA, Petersburg, VA
www.newspapers.com
KXL, Portland, OR
KPAM, Portland, OR
www.newspapers.com
KFWJ, Phoenix, AZ
KCAS, Slayton, TX
KLLL-FM, Lubbock, TX
www.newspapers.com
WWTV, Caddillac, MI & WWUP, Sault Ste. Marie, MI
WSBT-TV, South Bend, IN
WCSR, Hillsdale, MI
WHFB, Benton Harbor, MI
WWAM, Cadillac, MI
www.newspapers.com
WTBC, Indianapolis, IN
WTMT, Louisville, KY
www.newspapers.com
KXEL Waterloo, IA
www.newspapers.com
KXOK, St. Louis, MO
www.newspapers.com
WPOR, Portland, ME
WLKW, Providence, ME
www.newspapers.com
WUWU, Gainesville, FL
WDVH,
WGMA, Hollywood, FL
WMMB, Melbourne, FL
WTRS, Dunnellon, FL
www.newspapers.com
WLOC, Munfordville, KY
WDOC-AM, Prestonsburg, KY
www.newspapers.com
KXJB-TV, Fargo, ND
KCJB, Minot, ND
KHRT, Minot, ND
KTYN, Minot, ND
KMOT, Minot, ND
KDOM, Windom, MN
WMFG, Hibbing, MN
www.newspapers.com
KRAD East Grand Forks, MN
www.newspapers.com
WMUU Greenville, SC
www.newspapers.com
KGKO, Benton, AR
KNEA, Jonesboro, AR
KVSA, McGehee, AR
KPOC, Pocahontas, AR
KWYN, Wynne, AR
www.newspapers.com
KALL, Salt Lake City, UT
KLUB, Salt Lake City, UT
www.newspapers.com
WIBC, Indianapolis, IN
www.newspapers.com
KCCO, Lawton, OK
KNIB, Poteau, OK
KRPT, Anadarko, OK
www.newspapers.com
WCBM Baltimore, MD
www.newspapers.com
KMTY-FM, Clovis, NM
www.newspapers.com
KGA, Spokane, WA
KJRB, Spokane, WA
KQIN, Burien, WA
KREW, Sunnyside
Most state stations remained on the air
Clipping found in The Bellingham Herald published in Bellingham, Washington on 2/21/1971. Most state stations remained on the air
WSVA, Petersburg, VA
Virginia
Clipping found in Daily Press published in Newport News, Virginia on 2/21/1971. Virginia
KPAM, Portland, OR
Near-Panic Results as False Alert Flashed Across Country & Few Oregon Radio Stations Off Air
Clipping found in Statesman Journal published in Salem, Oregon on 2/21/1971. Near-Panic Results as False Alert Flashed Across Country & Few Oregon Radio Stations Off Air
KCAS, Slayton, TX
KLLL-FM, Lubbock, TX
Nation Quakes At False Emergency & But Only Two Shut Down-Alert Jolted Area Stations
Clipping found in Lubbock Avalanche-Journal published in Lubbock, Texas on 2/21/1971. Nation Quakes At False Emergency & But Only Two Shut Down-Alert Jolted Area Stations
WSBT-TV, South Bend, IN
WCSR, Hillsdale, MI
WHFB, Benton Harbor, MI
WWAM, Cadillac, MI
Little Excitement, Though Some Stations In State Went Along With Alert
Clipping found in The Kalamazoo Gazette published in Kalamazoo, Michigan on 2/21/1971. Little Excitement, Though Some Stations In State Went Along With Alert
WTMT, Louisville, KY
Mistake puts American civilians on alert
Clipping found in The Courier-Journal published in Louisville, Kentucky on 2/21/1971. Mistake puts American civilians on alert
Alert
Clipping found in Corpus Christi Times published in Corpus Christi, Texas on 2/21/1971. Alert
U.S. Emergency 'Alert' Is Flashed Accidently
Clipping found in Scrantonian Tribune published in Scranton, Pennsylvania on 2/21/1971. U.S. Emergency 'Alert' Is Flashed Accidently
WLKW, Providence, ME
Transmitter of False Alert 'Can't Imagine How... & Stations Remain On Air In N.E.
Clipping found in The Morning Union published in Springfield, Massachusetts on 2/21/1971. Transmitter of False Alert 'Can't Imagine How... & Stations Remain On Air In N.E.
WDVH,
WGMA, Hollywood, FL
WMMB, Melbourne, FL
WTRS, Dunnellon, FL
Alert Confuses State Radio-TV Station Staffs
Clipping found in Tallahassee Democrat published in Tallahassee, Florida on 2/21/1971. Alert Confuses State Radio-TV Station Staffs
WDOC-AM, Prestonsburg, KY
Mistake puts Americans on an alert
Clipping found in The Courier-Journal published in Louisville, Kentucky on 2/21/1971. Mistake puts Americans on an alert
KCJB, Minot, ND
KHRT, Minot, ND
KTYN, Minot, ND
KMOT, Minot, ND
KDOM, Windom, MN
WMFG, Hibbing, MN
Reaction & One Caller Feared 'Bomb Was Coming'
Clipping found in The Forum published in Fargo, North Dakota on 2/21/1971. Reaction & One Caller Feared 'Bomb Was Coming'
Reaction & One Caller Feared 'Bomb Was Coming'
Clipping found in The Forum published in Fargo, North Dakota on 2/21/1971. Reaction & One Caller Feared 'Bomb Was Coming'
1 Station In Area Affected
Clipping found in The Greenville News published in Greenville, South Carolina on 2/21/1971. 1 Station In Area Affected
KNEA, Jonesboro, AR
KVSA, McGehee, AR
KPOC, Pocahontas, AR
KWYN, Wynne, AR
Alert Reminiscent Of Pearl Harbor
Clipping found in Times Record published in Fort Smith, Arkansas on 2/21/1971. Alert Reminiscent Of Pearl Harbor
KLUB, Salt Lake City, UT
2 Radio Stations In S.L. Off Air Briefly in 'Alert'
Clipping found in The Salt Lake Tribune published in Salt Lake City, Utah on 2/21/1971. 2 Radio Stations In S.L. Off Air Briefly in 'Alert'
Indiana Stations Off Air
Clipping found in The Herald-Times published in Bloomington, Indiana on 2/21/1971. Indiana Stations Off Air
KNIB, Poteau, OK
KRPT, Anadarko, OK
Sooner Stations Sing On
Clipping found in The Lawton Constitution And Morning Press published in Lawton, Oklahoma on 2/21/1971. Sooner Stations Sing On
Only WCBM Becomes Silent Here In Response To Alert
Clipping found in The Baltimore Sun published in Baltimore, Maryland on 2/21/1971. Only WCBM Becomes Silent Here In Response To Alert
'Alert' Shuts Down Two Clovis Stations
Clipping found in Clovis News-Journal published in Clovis, New Mexico on 2/21/1971. 'Alert' Shuts Down Two Clovis Stations