USAF CONUS Gap-Filler Radar Sites
(AN/FPS-14 and AN/FPS-18), 1957 - 1970

"During the late 1950s another area of progress was the development and deployment of AN/FPS-14 and AN/FPS-18 gap-filler radars. Having a range of around sixty-five miles, these radars were placed in areas where it was thought enemy aircraft could fly low to avoid detection by the longer-range radars of the permanent and mobile radar networks. Gap-filler radar deployment peaked in December 1960 at 131 sites throughout the continental United States. Because the introduction of gap-filler radars alleviated the need for civilians to scan the skies for enemy bombers, the ADC disestablished the Ground Observer Corps on January 31, 1959."

Searching The Skies
USAF Air Combat Command
June, 1997


AN/FPS-18 site layout

AN/FPS-74

Frequency-diverse gap-filler radar, similar to AN/FPS-63; neither was ever fielded.


A magazine advertisement from Jan, 1962 "Time" illustrates what is believed to be the AN/FPS-74

The radome pictured here is located in Great Falls Nike Park in Herndon / Dranesville, VA, alongside Utterback Store Road. This Air Force gap-filler radar radome was not actually associated with this former Army Nike-Ajax missile facility (site # W-83L), and how the radome came to be here apparently is not known to present-day park officials in Fairfax County. It is also unknown where this radome was formerly used. However, it is definitely an Air Force gap-filler radar radome, and still has an Air Force serial number (not shown) stenciled on the inside. The radome is situated within the earthen berm where the missiles were once fueled. Panels were cut away on either side of the radome to allow kids to play inside. An eerie echo may be heard inside.

In the USGS aerial image above, from the "TerraServer" website, http://terraserver-usa.com/image.aspx?T=4&S=8&Z=18&X=5969&Y=86369&W=2, the old Air Force gap-filler radar radome is the round white object immediately to the left (east) of the baseball diamond. The Nike earthen berm is the brownish, tree-covered area around it to the east and south.

Here's an excerpt from a newspaper article about Montana gap-filler installations.

Here's a news clipping on gap-filler diesels

Adding a radome to a gap-filler


Photos below contributed by Don Horton

Manned Gap Fillers

[Click to download 185KB PDF file]
Designator Site State Notes N. Latitude W. Longitude
M-95C Alamogordo, NM ** NM      
  Alder River, NS, CN NS   45-28-21.53 61-44-24.92
TM-177B / P-28E Alexander, ND ND   47-40-41.52 103-46-49.6
P-18C Algona, IA ** IA      
CG8 Algonquin Park, ON, CN ON   45-33-43 078-33-58
M-130B Allen, NC NC   35-13-31.7 080-38-07.2
M-112C Alma, GA GA   31-36-28.85 082-32-48.56
P-34E Alpena, MI MI   45-04-15.3 083-34-02.7
P-46A Anacortes, WA WA   48-27-13.85 122-37-33.84
P-50B Andes, NY NY   42-13-13.0 074-51-05.1
TM-183A, M-95H Animas, NM ** NM      
TM-183B, M-95I, M-92F Apache, AZ ** AZ   31-36-50 109-10-42
P-42A / M-111F Aquone, NC NC   35-10-39.5 083-33-47.16
P-19D Arbor Vitae, WI ** WI      
M-99A Ashley, ND ** ND      
P-69C Askov, MN MN   46-14-12.31 092-44-32.63
CG17 Atikokan, ON, CN ON   48-47-45.5 091-36-41
P-30J / P-49E Atlanta, NY ** NY      
P-69D Aurora, MN MN   47-35-52.45 092-13-27.54
SM-138A Backus, MN ** MN      
P-17B Bagley, MN MN   47-36-18.4 095-25-33.4
P-43A Bainbridge, OH OH   39-15-35.6 083-14-16.0
M-128F Baker, CA ** CA   ~35-28-22 ~115-51-57
M-89A Ballinger, TX ** TX   31-40-53 099-58-27
P-14C Bangor, NY NY   44-49-38.85 074-22-43.9
M-111B Barnesville, GA GA   33-04-00.50 084-07-52.45
CG27 / P-66C Batchawana, ON, CN ON   47-04-31 084-22-56
SM-164A Beatty, NV ** NV   37-04-53 116-49-06
CG37 Beaver Tower, QC, CN QC   48-02-18 075-52-37
SM-133B Belgrade, NE ** NE      
CG15 Belleterre, QC, CN QC   47-21-25 078-40-54.8
SM-139B Bemis, SD ** SD      
M-92C Benson, AZ AZ   31-59-00 110-12-03
P-18B Beresford, SD ** SD      
P-68B Bergman, AR ** AR      
P-54A, RP-63E, P-56B Bethany Beach, DE DE   38-31-35 075-06-26
M-118C Beulah, OR ** OR      
SM-132A Big Falls, MN MN   48-11-26.4 093-47-30.8
M-89B Big Spring, TX TX   32-13-50.1 101-29-30.4
CG19 / M-119C Biscotasing, ON, CN ON   47-15-33.5 082-07-17
SM-164D Bishop, CA ** CA      
P-30I Blaine, PA ** PA      
SM-151B Blanchard, ID ** ID      
SM-134A, SM-133B Bloomfield, NE ** NE      
P-14B Blue Mtn. Lake, NY NY   43-52-20.7 074-24-04.1
M-114B Blythe Island, GA GA   31-09-43.29 081-33-44.07
P-68D Bolivar, MO ** MO      
SM-163A Boulder City, NV NV   35-59-44.85 114-51-48.97
M-88A Bovina, TX ** TX      
P-70G Bowling Green, MO MO   39-19-17.0 091-09-08.16
SM-145A Bradyville, TN TN   35-42-10.54 086-12-30.55
CG_ Brampton, ON, CN ON      
TM-199B Bridgeboro, GA GA   31-25-31.5 083-57-07.0
CG22 Bridgetown, NS, CN NS   44-52-34.75 065-18-23.30
P-80B Bridgewater, ME ME   46-25-15.82 068-01-28.10
P-21A Brockport, NY NY   43-11-28.72 077-56-00.75
M-98B Brockway, MT MT   47-17-00.95 105-59-01.8
RP-62E Brookfield, OH OH   41-13-03.55 080-33-43.62
P-19C Brooks, WI WI   43-49-38 089-42-53.7
M-89C Brownfield, TX TX   33-11-15.94 102-23-02.00
P-24A Browning, MT MT   48-52-14.28 113-10-22.30
  Buckhorn, ON, CN ON      
M-114A Bunnell, FL FL   29-21-16.15 081-18-42.10
M-113A Burgess, SC ** SC      
M-118A Burns Junction, OR OR   42-43-00 117-52-14.5
P-20A Burnside, MI MI   43-10-53.85 083-03-11.45
SM-162F Cactus City, CA ** CA      
M-128E Cadiz Summit, CA ** CA      
N-28A Cape Makkovik AS, NL, CN NL   55-13-30 059-08-45
P-33A Capetown, CA CA   40-26-40.37 124-23-27.56
M-90C Carlsbad, NM ** NM      
P-70A Carmi, IL ** IL   38-05-40.3 088-07-03.5
TM-198A Carrabelle, FL FL   29-51-56.5 084-37-52.7
TM-188A Carrizo Springs, TX TX   28-30-13.57 099-49-58.40
M-94A Carrizozo, NM ** NM      
TM-177A Carson, ND ** ND      
RP-31G Cedar Grove, WI ** WI      
CG11 / M-119B Chapleau, ON, CN ON   47-48-34.53 083-34-45.75
P-21B Charlotte Center, NY NY   42-18-15.7 079-10-40.3
P-1C / RP-1C Chehalis, WA WA   46-33-16.88 123-03-29.41
P-50C Cherry Valley, NY ** NY      
P-55A Chestertown, MD ** MD   39-14-50.5 076-08-35
P-45B / P-10E Chilmark, MA MA   41-21-18.94 070-44-06.82
M-99D Clark, SD ** SD      
P-30H / RP-62F Claysburg, PA PA   40-17-21.25 078-33-54.10
P-19N Clintonville, WI ** WI      
SM-164B Coaldale, NV ** NV      
TM-179A Columbia Falls, MT ** MT   48-43-27.3 114-18-53.3
M-95B Columbus, NM NM   31-47-55.39 107-44-02.25
TM-187B Comstock, TX TX   29-51-29.47 101-09-42.77
P-46B Concrete, WA ** WA   ~ 48-31-19 ~121-36-02.5
M-89F / M-88B Cone, TX ** TX      
SM-162B Corn Springs, CA CA   33-38-49.02 115-15-36.28
M-92B, TM-181B Covered Wells, AZ AZ   32-10-52.9 112-20-04.5
P-76D Coyote Wells, CA CA   32-41-27.05 115-53-21.75
P-60C Curlew, WA WA   48-52-37.46 118-47-07.80
N-27A Cut Throat Island AS, NL, CN NL   54-29-55.7 057-08-23.3
M-91A Daingerfield, TX ** TX      
P-71D / P-81A Dallas Center, IA IA   41-43-05.5 093-54-19
P-43D Danville, OH ** OH      
M-94C Datil, NM ** NM      
TM-199A Davenport, AL AL   32-00-14 086-19-45
P-29D Dawson, ND ** ND      
P-80A Deboullie Mtn., ME ** ME      
M-125A Delhi, LA LA   32-19-40.52 091-33-24.65
TM-189A / TM-191C Delmita, TX TX   26-38-52.8 098-27-41.25
M-127E Denio, NV ** NV   41-51-38.3 119-20-56.3
P-80C Depot Mtn., ME ME   46-51-10.35 069-48-08.32
SM-156B Desert Peak, NV ** NV   39-12-42.65 118-49-54.50
P-12B Disston, OR OR   43-35-08.54 122-39-10.41
TM-178A Dodson, MT ** MT      
P-30A; P-9B Duttonville, NJ ** NJ   ~41-18-19 ~074-41-20
CG28 / P-66D Eaglet River, ON, CN ON   ~47-56-58.5 ~085-24-57
P-30C East Meredith, PA ** PA      
P-70B Edgewood, MO MO   39-19-17.0 091-09-08.15
TM-196A, TM-198B Eglin AFB, FL FL   30-33-14.52 086-45-36.04
M-90D El Paso Gap, NM ** NM      
M-95A El Paso, TX TX   31-49-31.7 105-59-19.6
M-111E Elberton, GA GA   34-05-02.78 082-55-10.14
P-17A Elbow Lake, MN MN   46-05-36.55 095-57-25.65
TM-182A; M-92E Elfrida, AZ ** AZ   31-37-37 109-40-24
M-116A, P-56C, M-117B Elizabeth City, NC NC   36-14-46.14 076-15-20.24
CG9 / P-66E Elliot Lake, ON, CN ON   46-23-10 082-37-17
N-22B Elliston Ridge AS, NL, CN NL   48-37-33 053-03-31
P-47A Ellsworth, KS KS   38-50-28.65 098-11-48.68
P-20B Emery, MI MI   42-21-58.78 083-39-44.95
M-116B / M-117D Engelhard, NC NC   35-29-49.4 076-00-33.9
M-95D Engle, NM ** NM      
SM-144A Erin, TN ** TN      
P-11B / TM-179C /SM- Eureka, MT MT   48-51-52.63 115-07-31.87
P-18A Fairmont, MN ** MN      
P-79A Fannett, TX TX   29-45-21 094-14-42.27
CG45 Father Lake, QC, CN QC   49-17-24 075-31-13
P-66B Fibre, MI MI   46-09-10.85 084-47-05.00
P-20C Flat Rock, MI ** MI      
CG5 Formosa, ON, CN ON   43-55-51.5 081-00-23.7
M-115B Fort Bragg, NC NC   35-08-42.6 079-04-14.6
P-10B Fort Dearborn, NH NH   43-02-41.2 070-42-56.6
SM-132C Fort Frances, ON, CN ON      
P-63A Fort Loudon, PA ** PA   39-56-57 077-56-13
N-27C Fox Harbour AS, NL, CN NL   52-22-12 055-39-52
P-69A Franklin, MN ** MN   ~ 47-33-25.5 ~ 092-25-50
SM-156A Gabbs, NV NV   38-46-28.24 118-01-18.35
M-95G Gage, NM NM   32-12-26.2 108-07-35.15
P-25A Galata, MT MT   48-46-14.59 111-19-43.97
SM-134C Gannvalley, SD ** SD      
P-72A Garland, KS KS   37-45-40.03 094-38-51.58
P-68A Gateway, AR ** AR      
M-113B Georgetown, SC SC   33-18-57.5 079-19-26.1
  Geraldton, ON, CN ON      
P-9A Gibbsboro, NJ NJ   39-49-24.05 074-57-14.2
TM-177A / M-98A Glendive, MT MT   47-02-38.79 104-40-54.12
P-81D Glennville, MN ** MN      
M-92D Globe, AZ AZ   33-39-37.5 110-33-41
CG39 Gold Rock, ON, CN ON   49-25-50 092-51-43
SM-164A Goldfield, NV ** NV      
P-67E Goshen, IN ** IN      
CG34 Gowganda, ON, CN ON   ~47-34-27 ~080-28-44
P-29B Grafton, ND ND   48-24-43.1 097-22-05.75
CG43 Graham, ON, CN ON   ~49-20-18.5 ~090-32-46
CG_ Grand Fond, QC, CN QC      
  Grand Fond, QC, CN QC      
P-66A Grand Marais, MI MI   46-32-51.8 086-02-11.8
SM-159B Gray Court, SC ** SC   34-34-14 082-06-57
P-34B Grayling, MI ** MI   ~ 44-40-37.25 ~ 084-43-09.70
P-1B Greenwater, WA ** WA   47-02-27.48 121-35-47.35
TM-196B Gulfport, MS MS   30-24-26.10 089-03-31.50
SM-163C Halloran Springs, CA ** CA      
P-55C Hallsboro, VA ** VA      
P-55D Hanover, PA PA   39-51-28.3 076-56-52.6
CG23 Hastings, ON, CN ON   44-17-57 078-00-27
P-30I Hawley, PA ** PA      
SM-157C Hayfork, CA CA   40-39-32.0 123-13-10.25
M-125B / M-91B Heflin, LA ** LA      
P-43B Hellier, KY KY   37-17-08.1 082-31-36.9
P-55B Hermanville, MD MD   38-13-40.88 076-24-33.27
P-49F Higgins Bay, NY ** NY      
SM-139D Hillhead, SD ** SD      
M-93B Hillside, AZ AZ   34-25-44.5 112-57-46
P-25B Hogeland, MT MT   48-51-29.97 108-34-12.12
M-116C / M-115C Holly Ridge, NC NC   34-30-50.44 077-32-08.30
M-111D Homer, GA ** GA      
TM-181A; SM-162B Horn, AZ ** AZ   32-57-07.5 113-29-44.5
SM-134B Howard, SD ** SD      
M-129B Inverness, FL FL   28-41-17 082-24-06
P-60A Ione, WA WA   48-32-43.41 117-09-20.36
  Island Falls, ON, CN ON      
SM-157A Janesville, CA CA   40-15-38.90 120-33-26.09
M-112E Jeffersonville, GA GA   32-33-45.86 083-23-32.68
P-35C Jim Falls, WI WI   45-02-12.06 091-20-54.04
P-30F Joliett, PA PA   40-36-32.40 076-27-42.35
P-76F / P-59C Joshua Tree, CA CA   34-09-17.77 116-12-08.09
Z-210C Jupiter, FL FL   26-55-59.7 080-04-12
P-71B King City, MO ** MO      
P-71C Kingsley, IA ** IA      
P-82C Kingston, IN IN   39-22-55.1 085-22-33.1
P-40A Kittitas, WA WA      
CG29 L'Anse St. Jean, QC, CN QC   ~48-01-20 ~070-22-39
CG31 L'Ascension, QC, CN QC   ~46-47-26 ~074-50-55
P-81C / P-35F La Crescent, MN MN   43-51-34.67 091-18-59.60
  La Macaza, QC, CN QC      
P-81B La Motte, IA IA   42-19-24.70 090-39-26.85
TM-180B La Pine, OR OR   43-41-22 121-15-16.5
N-26B La Scie AS, NL, CN NL   49-58-48 055-31-48
CG12 La Tuque, QC, CN QC      
  Lac des Loups, QC, CN QC      
CG41 Lac Luzon, QC, CN QC   48-48-23 073-29-18.5
CG7 Lac Ste. Marie, QC, CN QC   45-56-13.68 075-51-03.46
M-125D Lake Charles GFA, LA LA   30-11-04.39 093-10-23.41
TM-200B Lake City, FL ** FL   ~ 30-10-38.80 ~ 082-34-15.00
TM-189B / TM-188C Laredo, TX TX   27-43-33.7 099-26-07.8
SM-163B Lathrop Wells, NV NV   36-38-43.23 116-20-19.52
P-37A Laytonville, CA CA   39-41-11.04 123-34-56.22
P-74A Lemoore, CA ** CA      
  Les Etroits, QC, CN QC      
P-43E / P-62B / RP-62B Lewisville, OH OH   39-45-23.3 081-13-39.8
P-35E Litchfield, MN ** MN      
P-2A Lockwood, CA CA   35-57-04.63 121-00-05.57
P-42B London, KY KY   37-09-02.90 083-59-29.81
P-20F London, ON, CN ON      
P-59B Lone Pine, CA ** CA      
Z-210B Long Key, FL FL   24-49-18.51 080-49-11.16
M-95J Lordsburg, NM ** NM   ~ 32-18-31 ~ 108-39-16
P-49D Lounsberry, NY ** NY      
SM-156C Lovelock, NV ** NV   40-15-19 118-23-23
CG26 Lucknow, ON, CN ON   43-57-48.6 081-32-50.6
P-82D Madisonville, KY KY   37-21-48.8 087-29-48.7
P-39A Malibu Beach, CA ** CA      
P-34C Manistee, MI ** MI      
CG44 Manitouwadge, ON, CN ON   49-09-27 085-50-22.5
SM-133A Mankato, KS ** KS   ~ 39-48-15 ~ 098-13-07
P-45A Manorville, NY NY   40-51-05.44 072-46-02.48
CG20 Marathon, ON, CN ON   48-45-11.11 086-34-52.95
P-20C Marblehead, OH OH   41-32-21.30 082-44-26.15
P-70D Marquand, MO MO   37-27-48.68 090-12-37.19
CG_ Marten River, ON, CN ON      
P-75A Mason, TX TX   30-33-45 099-26-50.2
CG33 Mattawa, ON, CN ON   46-22-32 078-45-00
P-60E Mazama, WA WA   48-44-30.0 120-40-49.5
TM-187A McCamey, TX TX   30-54-08.95 102-04-41.63
TM-177C McIntosh, SD SD   45-56-31.48 101-23-17.05
P-42C / M-111G Melvin Hill, NC NC   35-12-27.26 081-59-20.41
P-29D / SM-132B Middle River, MN MN   48-32-09.88 096-00-55.1
P-30A Middleburg, PA ** PA      
P-45C Middletown, CT ** CT   41-36-38 072-32-10
P-67A / P-20G Midland, MI MI   43-38-03.4 084-25-42.1
M-93A Mingus Mtn., AZ AZ   34-42-07 112-07-08.8
P-58A Modesto, CA **        
P-31D / RP-31D Monee, IL IL   41-24-35.85 087-45-54.30
P-30D Montrose, PA ** PA      
P-53B Mooresville, IN ** IN      
P-76E Moreno, CA CA   33-52-26.75 117-11-29.80
P-14A / P-10D / P-13C Moultonboro, NH ** NH   ~ 43-45-41.4 ~ 071-18-42.0
P-11C / SM-151D Moyie Springs, ID ID   48-44-50.8 116-12-19.0
CG21 / C-5C / P-80E Mt. Carleton, NB, CN NB   ~47-22-41 ~066-52-34
  Mt. Carleton, QC, CN QC      
M-115A Myrtle Beach, SC SC   33-46-11.13 078-47-19.06
Z-210A Naples, FL FL   26-09-16.3 081-46-07.0
P-53A / P-70F Neoga, IL IL   39-20-15.5 088-23-48.0
  New Carrying Place, ME ** ME      
P-2B New Cuyama, CA ** CA      
TM-196A / M-126A New Orleans, LA LA   30-01-40.55 090-02-56.60
P-50A New Preston, CT CT   41-43-37.2 73-21-11.3
P-50E New Salem, MA MA   42-30-37.5 072-21-13.5
  New Yarmouth, NS, CN NS   45-22-07.27 064-50-48.41
P-28B Newton, ND ** ND      
CG2 Nicolet, QC, CN QC   46-08-22.33 072-39-28.10
P-28A Niobe, ND ND   48-38-34.7 102-18-15.9
CG16 / P-69E Nipigon, ON, CN ON   49-01-20.57 088-26-24.51
CG32 Nishkotea Lake, QC, CN QC   ~47-00-41 ~077-07-02
CG1 Nobel, ON, CN ON   45-25-28 080-05-39
TM-192C Normangee, TX TX   30-59-33.5 096-06-53.0
P-35B Northfield, MN MN   44-25-14.17 093-11-05
P-60B Northport, WA WA   48-54-31.84 117-52-09.72
P-19A Norway, MI MI   45-47-23.1 087-52-13.7
SM-159A Norwood, GA ** GA   33-29-04.90 082-47-46.02
SM-164C Oasis, CA ** CA      
CG10 / M-119D Oba, ON, CN ON   48-58-50.5 083-56-41.5
P-82A Odon, IN IN   38-52-19.5 086-59-46.0
P-60D / P-40C Okanogan, WA WA   48-31-41.2 119-56-33.4
M-90A Orla, TX TX   31-50-52.3 104-32-10.0
P-58B Oroville, CA ** CA   ~ 39-28-55 ~ 121-37-31.4
P-49B Oswegatchie, NY NY   44-10-00.9 075-07-06
P-77A Ottawa, OK OK   36-51-36.9 094-47-06.2
P-82B / P-43C Owingsville, KY KY   38-11-29.7 083-49-00.0
P-16A Painesdale, MI MI   47-02-11.6 088-41-43.5
TM-191B Palacios, TX TX   28-41-24.78 096-14-50.05
RP-63C Palermo GFA, NJ NJ   39-13-24.78 74-41-14.88
SM-162D Palo Verde, CA CA   33-17-51.40 114-44-27.58
M-112A / M-113C Parris Island MCAS, SC SC   32-19-42 080-42-20.5
P-73B Paulding, OH ** OH      
SM-147A Pendroy, MT ** MT   48-05-48 112-17-56
TM-200A Perry, FL FL   30-04-41.28 083-34-47.74
P-34A Petoskey, MI MI   45-19-37.05 084-53-03.45
P-63B, P-21D Philipsburg, PA ** PA      
M-100B Philomath, OR OR   44-30-15.50 123-33-09.85
M-111C Piedmont, AL ** AL      
P-17F Pierz, MN ** MN      
SM-143B Piggott, AR ** AR      
P-12C Placer, OR OR   42-41-30.83 123-13-48.62
P-85B Pleasantview, IL ** IL      
  Port Neuf, QC, CN QC      
P-12A Port Orford, OR OR   42-44-13.6 124-30-35.8
M-112D Portal, GA ** GA      
P-11A / SM-151C Porthill, ID ID   48-59-35.38 116-28-50.78
M-128D / SM-162I Poston, AZ AZ   33-59-36.1 114-24-25.6
M-127A Quinn River Crossing, NV NV   41-27-56.12 118-17-00.47
CG_ Rapides des Joachims, QC, CN QC      
  Redditt, ON, CN ON      
M-99C Redfield, SD ** SD      
P-77C Reece, KS ** KS      
P-28D Regan, ND ND   47-06-03.9 100-32-17.6
P-67B / P-73J Richland Center, IN IN   41-07-04.35 086-14-27.35
P-73F Ridgeville Center, OH ** OH      
TM-191A Riviera, TX TX   27-19-37.8 097-44-35.8
P-34F Roscommon, MI ** MI   44-29-38 084-39-41.5
P-56D, M-121A Roxbury, VA ** VA      
CG42 / P-80F Saint Adalbert, QC, CN QC   46-50-10 069-54-22
SM-143A Salem, AR ** AR      
P-76B San Ysidro, CA CA   32-33-42.12 117-02-06.60
M-90B Santa Rosa, NM NM   34-51-39.4 104-45-24.6
P-67C / P-34G Saugatuck, MI MI   42-39-40.49 086-12-32.74
P-77B Savonburg, KS ** KS      
TM-192B Schulenburg, TX TX   29-45-42.8 096-55-51.2
CG6 Scotch Settlement, NB, CN NB   45-43-19.5 65-46-24.5
M-128B Searchlight, NV ** NV      
P-13A / P-65B Sedgwick, ME ME   44-18-50.6 068-38-22.2
M-92A Sells, AZ AZ   32-06-44 112-04-29
P-59A Shafter, CA CA   35-30-08.95 119-11-52.85
P-67D / P-34H Shelby, MI MI   43-35-59.15 086-20-25.3
CG21 Shemogue, NB, CN NB   46-05-35.7 064-16-49.4
P-29A Sheyenne, ND ND   47-49-40.40 099-23-53.95
P-85C Sibley, IL ** IL      
M-89E Sidney, TX TX   31-54-41.7 098-42-07.1
M-90B / M-95F Sierra Blanca, TX TX   31-41-52.55 105-22-57.12
  Silver Falls, ON, CN ON      
M-89D / P-78A Southbend, TX ** TX      
CG25 / P-20E Sparta, ON, CN ON   42-43-15.83 081-06-17.78
P-35D or F Sparta, WI ** WI      
N-27B Spotted Island AS, NL, CN NL   53-30-59.9 055-44-57.7
  Springton, PE, CN PE      
CG36 / P-80G Squatteck, QC, CN QC   47-55-25 068-33-00
  St. Charles de-Bellechasse, QC, CN QC   ~46-49-10 ~070-55-57
  St. Cleophas, QC, CN QC      
CG4 / M-102B St. Joseph, NS, CN NS   44-15-48.6 066-06-56
M-112B St. Simons Island, GA ** GA      
M-113A Stateburg, SC SC   33-56-36.9 080-31-20.0
  Ste. Cecile Stn., QC, CN QC   ~45-41-19 ~070-58-10
P-73B Stillwell, OH ** OH      
P-50D Stoddard, NH ** NH   ~ 43-05-32 ~ 072-07-56
SM-162C Stone Cabin, AZ AZ   33-14-23.4 114-15-26.5
CG24 / P-21E Stoney Creek, ON, CN ON   43-10-16.1 079-44-09.7
CG30 Summerville Centre, NS, CN NS   43-58-45 064-50-25
TM-195A Summit, MS MS   31-17-28.7 090-27-29.5
P-49A Suttons Corner, NY NY   43-21-17.35 076-17-09.10
P-24C Sweetgrass, MT MT   48-58-49.35 111-57-43.32
SM-162A Tacna, AZ AZ   32-41-01.2 114-03-08
CG38 Taschereau, QC, CN QC   48-43-12 078-42-25
P-76A Tecate, CA CA   32-34-45.40 116-41-19.97
P-56A Temperanceville, VA VA   37-51-37.69 075-33-28.63
P-55F / RP-62G Thomas, WV WV   39-08-51.87 079-34-14.79
P-62A / RP-62A Thompson, OH OH   41-41-09.6 081-02-36.6
P-76C Tierra del Sol, CA CA   32-38-50.58 116-19-02.91
CG14 Timmins, ON, CN ON   48-32-12 081-32-30
M-91C Tinsman, AR ** AR      
CG3 Tobermory, ON, CN ON   45-13-28 081-38-18
CG13 Todd Mountain, NB, CN NB   46-32-31 066-42-05.7
M-128C / SM-162H Topock, AZ AZ   34-43-20.61 114-15-09.13
P-65A Topsfield, ME ME   45-23-19.23 067-47-47.46
P-30B Topton, PA ** PA      
P-30J Trumbull Corners, NY ** NY   42-23-11 ? 076-40-08 ?
M-95E Truth or Consequence, NM ** NM      
P-17C Twin Valley, MN ** MN      
P-19B Two Creeks, WI WI   44-19-25.05 087-34-46.70
P-30E Ulysses, PA PA   41-52-49.15 077-42-51.16
M-127B Unionville, NV NV   40-33-45.1 118-03-08.0
P-73A Upland, IN ** IN      
P-69B Upson, WI WI   46-25-10.1 090-23-06.2
P-29C Valley City, ND ND   46-50-52.5 098-03-09.7
P-79B Van Vleck, TX TX   29-00-13.25 095-53-39.65
P-68C Versailles, MO ** MO      
P-70C Vichy, MO MO   38-08-07.93 091-46-24.04
M-128A Vidal Junction, CA ** CA      
P-20D Vienna, ON, CN ** ON      
P-71A Virginia, NE ** NE      
SM-150A Waha, ID ID   46-17-30.30 116-53-01.28
P-85A Walnut, IL ** IL      
P-73G Warsaw, OH ** OH      
P-28C Washburn, ND ** ND      
P-64A / P-81E Washington, IA IA   41-16-16.4 091-44-40.2
M-100A Washougal, WA WA   45-43-01.16 122-17-45.02
TM-194A / M-125C Weeks Island, LA LA   29-48-34.48 091-48-22.06
P-40B Wenatchee, WA WA   47-30-31.40 120-14-24.66
P-10A Westboro, MA MA   42-14-23.14 071-37-41.2
M-99B Westfield, ND ** ND      
CG18 Westport, ON, CN ON   44-44-01.3 076-25-18.2
CG35 / P-69F Whitefish Lake, ON, CN ON   48-09-40 089-56-48
CG40 / P-80E Whites Brook, NB, CN NB   47-41-46.90 067-11-16.48
P-27A, P-26D Whitetail, MT MT   48-55-46.05 105-15-00.25
P-26A Whitewater, MT MT   48-48-04.6 107-32-00.7
SM-157B Whitmore, CA CA   40-44-32.19 121-47-23.69
SM-163D Wildrose Station, CA ** CA      
P-1A Wiley City, WA ** WA      
RP-31F Williams Bay, WI WI   42-36-57.54 088-32-25.47
P-47B Wilsey, KS KS   38-40-0.62 096-44-09.88
P-77D Winfield, KS KS   37-12-47.77 096-57-00.47
M-129A Winter Garden, FL FL   28-29-24.15 081-30-29.53
SM-151E / TM-179B Yaak, MT MT   48-51-44.7 115-43-19.2
TM-180A Yreka, CA CA   41-44-17.97 122-46-36.15
M-94B Zuni, NM NM   34-58-41.4 108-49-47.2