| State | Stations | Recorders* |
|---|---|---|
| Alabama | 01 | 02 |
| Alaska | 76 | 90 |
| Arizona | 04 | 04 |
| Arkansas | 06 | 06 |
| California | 330 | 482 |
| Colorado | 01 | 03 |
| Georgia | 02 | 02 |
| Hawaii | 31 | 31 |
| Idaho | 07 | 08 |
| Illinois | 05 | 05 |
| Indiana | 02 | 02 |
| Kansas | 01 | 01 |
| Kentucky | 01 | 01 |
| Maine | 01 | 01 |
| Massachusetts | 08 | 08 |
| Missouri | 16 | 19 |
| Montana | 09 | 12 |
| Nevada | 17 | 17 |
| New Hampshire | 02 | 02 |
| New Mexico | 08 | 14 |
| New York | 08 | 09 |
| North Carolina | 02 | 02 |
| Ohio | 02 | 02 |
| Oklahoma | 03 | 03 |
| Oregon | 30 | 82 |
| Pennsylvania | 02 | 02 |
| Rhode Island | 01 | 01 |
| South Carolina | 06 | 07 |
| Tennessee | 11 | 11 |
| Utah | 31 | 39 |
| Vermont | 01 | 01 |
| Virginia | 05 | 05 |
| West Virginia | 01 | 01 |
| Washington | 39 | 50 |
| Puerto Rico | 94 | 99 |
| Virgin Islands | 01 | 01 |
| British Virgin Islands | 05 | 07 |
| TOTALS | 718 | 1039 |
* Does not include devices that do not record time series data such as seismic alarms.