| MCMontrose County | Montrose | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MCMorgan Corporation | Denver | CO | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| MPMoser Printing | Englewood | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| MTMother's Therapy Organics LLC | Castle Rock | CO | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| MEMountain Express Printing | Colorado Springs | CO | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| MPMountain Park Concrete INC | Granby | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MSMountain States Paving | Centennial Area | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MSMountain Stone INC | Cortez | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MWMurphy Wall Products - Florence | Florence | CO | Chemical Manufacturing325520 | — | ◇ UNVERIFIED |
| MWMy Wicked Dude LLC | Colorado Springs | CO | Miscellaneous Manufacturing339920 | — | ◇ UNVERIFIED |
| NBNapro Biotherapeutics - Spine Rd | Boulder | CO | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| NPNational Printing & Packaging CORP | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| NUNeoplan USA CORP | Lamar | CO | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NDNer Data Products INC | Denver | CO | Miscellaneous Manufacturing339940 | — | ◇ UNVERIFIED |
| NBNew Belgium Brewing CO - Bottling Facili | Fort Collins | CO | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| NDNew Deal Deicing - Denver Plant | Denver | CO | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| NINielsons INC | Cortez | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| NINorgren INC | Littleton | CO | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| NCNorthern Colorado Feed | Lucerne | CO | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| NPNorth Park Advantage - North Park Plant | Walden | CO | Petroleum and Coal Products Manufacturing324199 | — | ◇ UNVERIFIED |
| NRNrg Reliabilty - Ziegenfelder | Denver | CO | Food Manufacturing311311 | — | ◇ UNVERIFIED |
| NPNso Press, LLC | Denver | CO | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| OEO E a | Aurora | CO | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| OCOldcastle - Crested Butte Rmc Plant | Crested Butte Area | CO | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| OCOld Castle Dba United - Two Feathers Pit | Montrose | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group - 1771 Shields Dr | Steamboat Springs | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group - Cugnini Pit | Durango | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group Dba United Companies | Norwood | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group Dba United CO of Mesa | Rifle | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group Dba United CO of Mesa | Montrose | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group INC. Dba Four Corners | Cortez | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group- Port Concrete Plant | Gunnison | CO | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group- Tri County Pit | Hotchkiss | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| OSOldcastle Sw Group - Wattenberg West | Brighton, 2.0 Mi Nw of | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| OSOldcastle Sw Grp - Gunnison Redi-mix Pit | Gunnison | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| OWOld Western Paint CO INC | Denver | CO | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| OMOliver Manufacturing Company, INC. | Rocky Ford | CO | Machinery Manufacturing333414 | — | ◇ UNVERIFIED |
| OPOmega Products International, INC. | Commerce City | CO | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| OMOne More Part Dba Omp | Longmont | CO | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| OBOptima Batteries Incorporated | Aurora | CO | Electrical Equipment, Appliance & Component Manufacturing335910 | — | ◇ UNVERIFIED |
| OBOrepac Building Products | Denver | CO | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| PPPachellos Printing | Westminster | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| PAPacific Aeromotive Corporation | Erie | CO | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| PCPackaging Corporation of America | Denver | CO | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| PSPackaging Systems International | Denver | CO | Machinery Manufacturing333922 | — | ◇ UNVERIFIED |
| PCPallet Companies INC. (dba Ifco Systems) | Aurora | CO | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| PUParadise Unlimited INC | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| PHParker Hannifin Corporation, Wilkerson | Englewood | CO | Fabricated Metal Product Manufacturing332919 | — | ◇ UNVERIFIED |
| PSParkside Soap Shoppe, LLC | Parker | CO | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| PCPcc Composites | Frederick | CO | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
