| LPLng Plant | Gillette | WY | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| LCLost Cabin Gas Plant | Fremont | WY | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| LPLovell Plant (western Sugar) | Big Horn County | WY | Food Manufacturing311313 | — | ◇ UNVERIFIED |
| LPLummis Pit | Laramie | WY | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| LCLusk Concrete Batch Plant | Niobrara | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MFMade4u Foods LLC | Laramie | WY | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| MPMadsen Pit (aka Casper Pit) | Natrona County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MEMagna Energy Services Facility | Campbell County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MTMasaba Twin Screen | Platte | WY | Machinery Manufacturing333131 | — | ◇ UNVERIFIED |
| MAMcclellan and Mcqueen INC | Riverton | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MHMd-13200 (portable Hot Mix Asphalt Plant) | Carbon | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MIMesa Investments: Industrial | Rock Springs | WY | Machinery Manufacturing333512 | — | ◇ UNVERIFIED |
| MBMinerite Buffalo Properties, LLC | Buffalo | WY | Machinery Manufacturing333248 | — | ◇ UNVERIFIED |
| MTMmi Tank and Industrial Services, INC. | Cheyenne | WY | Fabricated Metal Product Manufacturing332420 | — | ◇ UNVERIFIED |
| MBMobile Boiler (wv-10207) | Laramie County | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MMMobiscreen Ms 16d | Gillette | WY | Machinery Manufacturing333131 | — | ◇ UNVERIFIED |
| MSMonsanto: Septic Systems | Rock Springs | WY | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| MMMoorehead Machinery and Boiler Company | Wheatland | WY | Fabricated Metal Product Manufacturing332410 | — | ◇ UNVERIFIED |
| MWMountain West Crushing Plant | Natrona | WY | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| MWMountain West Marketing LLC | Cody | WY | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| NCNatrona County School Distric | Casper | WY | Machinery Manufacturing333414 | — | ◇ UNVERIFIED |
| NCN C Machine LLC | Casper | WY | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| NCNewcastle Concrete Batch Plant | Weston | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| NFNewcastle Facility | Weston | WY | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| NRNewcastle Refinery | Weston | WY | Petroleum and Coal Products Manufacturing324110 | — | ◇ UNVERIFIED |
| NCNorth Compressor Station | Park | WY | Machinery Manufacturing333618 | — | ◇ UNVERIFIED |
| OLOcean-hill, Llc: Septic Syste | Cheyenne | WY | Food Manufacturing311612 | — | ◇ UNVERIFIED |
| OGOpal Gas Plant | Lincoln | WY | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| OCOptec Communications | Cheyenne | WY | Electrical Equipment, Appliance & Component Manufacturing335921 | — | ◇ UNVERIFIED |
| OBOregon Basin - Polyacrylamide Plant | Park | WY | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| PPP4 Production, LLC | Rock Springs | WY | Petroleum and Coal Products Manufacturing324199 | — | ◇ UNVERIFIED |
| PSPacific Steel & Recycling | Mills | WY | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| PPPaintrock Processing: Septic | Hyattville | WY | Food Manufacturing311613 | — | ◇ UNVERIFIED |
| PTPepper Tank & Contracting | Casper | WY | Fabricated Metal Product Manufacturing332313 | — | ◇ UNVERIFIED |
| PAPortable Asphalt Plant (ct-1042) | Campbell County | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| PAPortable Asphalt Plant Ct-1329 | Lincoln | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| PAPortable Asphalt Plant (ct-93 | Platte County | WY | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| PAPortable Asphalt Plant (md-1567)) | Washakie County | WY | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| PBPortable Batch Plant | Hanna | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PBPortable Batch Plant | Sheridan | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PCPortable Cement Batch Plant ( | Niobrara County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PCPortable Concrete Batch Plant | Big Horn County | WY | Machinery Manufacturing333120 | — | ◇ UNVERIFIED |
| PCPortable Concrete Batch Plant | Jackson | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PCPortable Concrete Batch Plant | Sweetwater County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PCPortable Concrete Batch Plant | Natrona County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PCPortable Concrete Batch Plant | Converse County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PCPortable Concrete Batch Plant | Sweetwater County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PCPortable Concrete Batch Plant | Washakie County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PCPortable Concrete Batch Plant | Sweetwater County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| PCPortable Concrete Batch Plant | Teton County | WY | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
