| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Secane | city | Pennsylvania | United States | 39.91 | -75.30 | 98 | |
| Secaucus | city | New Jersey | United States | 40.79 | -74.06 | 6 | |
| Secession | city | North Carolina | United States | 33.93 | -78.29 | 39 | |
| Secessionville | city | South Carolina | United States | 32.71 | -79.94 | 3 | |
| Secessionville Acres | city | South Carolina | United States | 32.70 | -79.95 | 3 | |
| Sechlerville | city | Wisconsin | United States | 44.37 | -91.03 | 948 | |
| Sechrist Mill | city | Pennsylvania | United States | 39.86 | -76.59 | 830 | |
| Seckman | city | Missouri | United States | 38.40 | -90.43 | 830 | |
| Secluded Acres | city | Minnesota | United States | 47.53 | -94.89 | 1669 | |
| Secluded Hills | city | Arkansas | United States | 34.80 | -92.44 | 396 | |
| Seclusion | city | Texas | United States | 29.30 | -96.70 | 147 | |
| Seco | city | Kentucky | United States | 37.17 | -82.73 | 1669 | |
| Seco Mines | city | Texas | United States | 28.75 | -100.50 | 830 | |
| Secoal | city | West Virginia | United States | 37.98 | -81.81 | 830 | |
| Second Addition Mobile Home Park | city | Kansas | United States | 37.61 | -97.38 | 1669 | |
| Second Cliff | city | Massachusetts | United States | 42.19 | -70.72 | 0 | |
| Second Corinth | city | Texas | United States | 30.14 | -96.12 | 196 | |
| Second Crossing | city | Texas | United States | 29.52 | -99.70 | 1669 | |
| Second Crossing | city | Texas | United States | 29.78 | -98.16 | 830 | |
| Second Garrotte | city | California | United States | 37.82 | -120.20 | 3349 | |
| Second Lake (historical) | city | Louisiana | United States | 30.66 | -91.79 | 22 | |
| Second Mesa | city | Arizona | United States | 35.79 | -110.51 | 5869 | |
| Second Milo | city | New York | United States | 42.61 | -77.04 | 1040 | |
| Second Rancho Chico Additio Colonia | city | Texas | United States | 28.03 | -97.50 | 52 | |
| Second Roosevelt Colonia | city | Texas | United States | 27.97 | -97.40 | 49 | |
| Secondcreek | city | West Virginia | United States | 37.67 | -80.45 | 1998 | |
| Seconsett Island | city | Massachusetts | United States | 41.57 | -70.51 | 9 | |
| Secor | city | Illinois | United States | 40.74 | -89.14 | 830 | |
| Secor (historical) | city | Iowa | United States | 42.31 | -93.07 | 948 | |
| Secor Gardens | city | New York | United States | 40.99 | -73.76 | 177 | |
| Secor Woods | city | Ohio | United States | 41.57 | -83.60 | 830 | |
| Secord | city | Michigan | United States | 44.02 | -84.35 | 830 | |
| Secotan | city | Florida | United States | 30.18 | -83.63 | 36 | |
| Secrest (historical) | city | Arkansas | United States | 34.48 | -91.96 | 213 | |
| Secret (historical) | city | Nevada | United States | 40.83 | -115.21 | 6709 | |
| Secret Canyon (historical) | city | California | United States | 39.19 | -120.59 | 5285 | |
| Secret Town | city | California | United States | 39.16 | -120.88 | 3349 | |
| Secretary | city | Maryland | United States | 38.61 | -75.95 | 16 | |
| Section | city | Alabama | United States | 34.70 | -87.48 | 830 | |
| Section | city | Alabama | United States | 34.58 | -85.99 | 1669 | |
| Section Thirty | city | Minnesota | United States | 47.91 | -91.78 | 1669 | |
| Sector | city | West Virginia | United States | 39.23 | -78.86 | 974 | |
| Sector Abra de Pimiento | city | Puerto Rico | United States | 18.45 | -66.54 | 16 | |
| Sector Alvares | city | Puerto Rico | United States | 18.48 | -66.82 | 91 | |
| Sector Arizon | city | Puerto Rico | United States | 18.29 | -66.89 | 1108 | |
| Sector Casualidad | city | Puerto Rico | United States | 18.38 | -67.20 | 45 | |
| Sector Catanito | city | Puerto Rico | United States | 18.45 | -66.54 | 16 | |
| Sector Cementerio | city | Puerto Rico | United States | 18.45 | -66.55 | 39 | |
| Sector Cerro Morales | city | Puerto Rico | United States | 18.45 | -66.54 | 16 | |
| Sector Columbia | city | Puerto Rico | United States | 18.19 | -67.15 | 95 | |
| Sector Dulces Labios | city | Puerto Rico | United States | 18.20 | -67.15 | 39 | |
| Sector Florida | city | Puerto Rico | United States | 18.49 | -67.03 | 301 | |
| Sector Isla Verde | city | Puerto Rico | United States | 18.07 | -66.36 | 830 | |
| Sector La Ceiba | city | Puerto Rico | United States | 18.36 | -66.55 | 830 | |
| Sector La Loma | city | Puerto Rico | United States | 18.06 | -66.72 | 278 | |
| Sector La Sabana | city | Puerto Rico | United States | 18.17 | -65.87 | 344 | |
| Sector La Tosca | city | Puerto Rico | United States | 18.34 | -66.17 | 830 | |
| Sector LaSalle | city | Puerto Rico | United States | 18.45 | -66.94 | 830 | |
| Sector Las Parcelas | city | Puerto Rico | United States | 18.36 | -66.55 | 830 | |
| Sector Laso | city | Puerto Rico | United States | 18.22 | -66.22 | 1669 | |
| Sector Loma Santa | city | Puerto Rico | United States | 18.49 | -67.03 | 301 | |
| Sector Los Flores | city | Puerto Rico | United States | 18.17 | -66.15 | 1669 | |
| Sector Los Garbanzos | city | Puerto Rico | United States | 18.17 | -65.87 | 252 | |
| Sector Los Gardens | city | Puerto Rico | United States | 18.08 | -66.96 | 400 | |
| Sector Los Quemaos | city | Puerto Rico | United States | 18.37 | -66.56 | 879 | |
| Sector Olimpia | city | Puerto Rico | United States | 18.15 | -66.71 | 2759 | |
| Sector Pena Militar | city | Puerto Rico | United States | 18.48 | -66.85 | 160 | |
| Sector Piedras Blancas | city | Puerto Rico | United States | 18.05 | -67.06 | 167 | |
| Sector Pueblo Nuevo | city | Puerto Rico | United States | 18.18 | -66.97 | 1669 | |
| Sector Puente Salsa | city | Puerto Rico | United States | 18.47 | -66.85 | 114 | |
| Sector Quemado Interior | city | Puerto Rico | United States | 18.18 | -65.97 | 830 | |
| Sector Rafael Castro | city | Puerto Rico | United States | 18.29 | -66.89 | 1108 | |
| Sector Retiro | city | Puerto Rico | United States | 18.29 | -66.89 | 1213 | |
| Sector Ruberte | city | Puerto Rico | United States | 18.06 | -66.74 | 249 | |
| Sector Santa Teresita | city | Puerto Rico | United States | 18.18 | -66.16 | 1669 | |
| Sector Seboruco | city | Puerto Rico | United States | 18.45 | -66.55 | 26 | |
| Sector Trastalleres | city | Puerto Rico | United States | 18.21 | -67.15 | 39 | |
| Sector Varsovia | city | Puerto Rico | United States | 18.04 | -65.88 | 383 | |
| Sector Villa Brava | city | Puerto Rico | United States | 18.21 | -66.23 | 1249 | |
| Sector Villa Casino | city | Puerto Rico | United States | 18.19 | -66.29 | 1669 | |
| Sector Vista Alegre | city | Puerto Rico | United States | 18.41 | -66.33 | 154 | |
| Secundino | city | Arizona | United States | 31.69 | -111.44 | 3349 | |
| Security | city | Colorado | United States | 38.76 | -104.74 | 5869 | |
| Security | city | Louisiana | United States | 31.53 | -91.82 | 55 | |
| Security | city | Maryland | United States | 39.65 | -77.69 | 830 | |
| Security | city | Texas | United States | 30.33 | -95.24 | 173 | |
| Security Acres | city | Arizona | United States | 34.55 | -111.86 | 3349 |