There is no national list of weigh stations. Every state enforces the same federal weight limits, but only 17 of the 50 publish where their fixed scales and ports of entry are as open data a program can read. Those 17 states publish 381 sites between them. Where the data exists, Washington has the densest network at 8.0 sites per 100 interstate miles.
What was counted
We searched every state transportation agency, highway patrol and revenue department for a machine-readable list of weigh stations, inspection stations or ports of entry: an ArcGIS service, a CSV or GeoJSON download, or a published table with coordinates. A state counts as publishing if a list with locations exists under terms that allow reuse. Proposed sites, portable scale locations and closed stations were dropped where the data marks them. Interstate mileage is FHWA HM-20 (2024), rural plus urban.
The 17 states with open data
| # | State | Published sites | Interstate miles | Sites per 100 mi | Publisher |
|---|---|---|---|---|---|
| 1 | Washington | 61 | 763 | 8.0 | Puget Sound Regional Council (Washington State scale houses) |
| 2 | Florida | 64 | 1,495 | 4.3 | Florida Department of Transportation |
| 3 | Idaho | 18 | 612 | 2.9 | Idaho Transportation Department |
| 4 | California | 53 | 2,456 | 2.2 | California Department of Transportation (Caltrans) |
| 5 | Oklahoma | 19 | 983 | 1.9 | Oklahoma Department of Transportation |
| 6 | New Mexico | 18 | 999 | 1.8 | New Mexico Department of Transportation |
| 7 | Montana | 19 | 1,192 | 1.6 | Montana Department of Transportation |
| 8 | Colorado | 15 | 952 | 1.6 | Colorado Department of Transportation |
| 9 | Iowa | 11 | 789 | 1.4 | Iowa Department of Transportation |
| 10 | Wisconsin | 12 | 878 | 1.4 | Wisconsin Department of Transportation |
| 11 | Wyoming | 12 | 913 | 1.3 | Wyoming Highway Patrol |
| 12 | Illinois | 28 | 2,186 | 1.3 | Illinois Department of Transportation |
| 13 | North Carolina | 18 | 1,433 | 1.3 | North Carolina Department of Transportation |
| 14 | Arizona | 13 | 1,168 | 1.1 | Arizona Department of Transportation |
| 15 | Utah | 9 | 943 | 0.9 | Utah Department of Transportation |
| 16 | Alaska | 9 | 1,080 | 0.8 | Alaska Department of Transportation and Public Facilities |
| 17 | Minnesota | 2 | 913 | 0.2 | Minnesota Department of Transportation (MnDOT) Commercial Vehicle Operations |
Two cautions. Density per interstate mile rewards states like Washington and Florida whose lists include every fixed scale on state routes, not only interstates. And a low count can reflect the list, not the road: Minnesota's 2 sites are the ones on its published page, not a full inventory.
The 33 states that publish nothing usable
Alabama, Arkansas, Connecticut, Delaware, Georgia, Hawaii, Indiana, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Mississippi, Missouri, Nebraska, Nevada, New Hampshire, New Jersey, New York, North Dakota, Ohio, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Vermont, Virginia, West Virginia. Several of these have a web page or PDF describing their scales, but without coordinates or an address it cannot be mapped, and several publish nothing at all. A driver crossing them relies on signage, a bypass transponder, or word of mouth.
Why it matters
State law in every state requires a commercial vehicle to enter an open weigh station when signs direct it in; passing one is a citation, and the inspection that often follows can add violations to the carrier's safety record. Bypass programs price their service partly on knowing where the stations are. Open location data lets navigation apps, fleet software and sites like this one show drivers what is ahead; it costs a state nothing to publish a layer it already maintains. The federal weight limits the stations enforce are on the truck weight limits page, what happens inside on the weigh stations page, and the 381 published sites are in the weigh station directory.
Method and reuse
Sources: the state agency data services named in the table; FHWA Highway Statistics 2024, table HM-20. Computed 2026-09-28. States that publish a list after this date will be added; the ranking may be reproduced with attribution to DriverComply and a link to this page.