| IDI D Russell Company Laboratories | Longmont | CO | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| ICIke Concrete | Fairplay | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| IWImage West Impression | Denver | CO | Textile Mills313310 | — | ◇ UNVERIFIED |
| IPInca Paint and Print | Broomfield | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| IIIndivior INC | Fort Collins | CO | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| ICIndustrial Container Services CO LLC | Brighton | CO | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| IRInland Ready Mix, LLC - Fort Lupton | Fort Lupton | CO | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| IIInnovative Ideas, Inc. dba Prescription Lock | Lone Tree | CO | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| IWInnov Wire Technology INC | Colorado Spgs | CO | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| ILIntegrated Listening Systems, LLC | Aurora | CO | Computer and Electronic Product Manufacturing334510 | — | ◇ UNVERIFIED |
| IAIntegrity Applied Science | Longmont | CO | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| ICIntel CORP (f23) | Colorado Springs | CO | Computer and Electronic Product Manufacturing334413 | — | ◇ UNVERIFIED |
| ICIntel Corporation - Ft Collins | Fort Collins | CO | Computer and Electronic Product Manufacturing334111 | — | ◇ UNVERIFIED |
| IWInterior Woodwork INC | Denver | CO | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| ICIntermountain Color | Boulder | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ICIntermountain Color | Broomfield | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ICIntermountain Color | Colorado Springs | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| ICIntermountain Color Denver | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| IHInternational Hydraulics Consultants, Inc. | Colorado Springs | CO | Plastics and Rubber Products Manufacturing326220 | — | ◇ UNVERIFIED |
| IPInternational Paper-corrugated Box Plant | Golden | CO | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| IPInternational Paper-wheat Ridge | Wheat Ridge | CO | Paper Manufacturing322211 | — | ◇ UNVERIFIED |
| IBInterstate Brands Corporation | Denver | CO | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| IPIntl Packaging INC | Colorado Springs | CO | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| IIInx International Ink CO | Denver | CO | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| IGIon Graphics, Inc. | Alamosa | CO | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| IMIron & Metals INC | Denver | CO | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| IIItt Industries | Loveland | CO | Computer and Electronic Product Manufacturing334220 | — | ◇ UNVERIFIED |
| JPJb Precision Coatings | Broomfield | CO | Machinery Manufacturing333248 | — | ◇ UNVERIFIED |
| JGJbs Greeley Lamb Facility | Greeley | CO | Food Manufacturing311611 | — | ◇ UNVERIFIED |
| JFJenson Foods | Brighton | CO | Food Manufacturing311225 | — | ◇ UNVERIFIED |
| JRJim Rushton's Incorporated | Denver | CO | Plastics and Rubber Products Manufacturing326299 | — | ◇ UNVERIFIED |
| JMJ-m Manufacturing Co., INC. Dba Jm Eagle | Pueblo West | CO | Plastics and Rubber Products Manufacturing326122 | — | ◇ UNVERIFIED |
| JMJMS Machining & Design, Inc. | Colorado springs | CO | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| JIJobsite INC | Grand Junction | CO | Machinery Manufacturing333518 | — | ◇ UNVERIFIED |
| JIJobsite INC | Delta | CO | Machinery Manufacturing333513 | — | ◇ UNVERIFIED |
| JBJohn Balistreri | Denver | CO | Nonmetallic Mineral Product Manufacturing327110 | — | ◇ UNVERIFIED |
| JHJohn H Harland CO | Lakewood | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
 Johns Manville - Industrial Insulation | Fruita | CO | Plastics and Rubber Products Manufacturing326140 | — | ◇ UNVERIFIED |
| JPJohnson Printing | Boulder | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| JBJw Brewer Tire CO | Colorado Springs | CO | Plastics and Rubber Products Manufacturing326212 | — | ◇ UNVERIFIED |
| JIJwbsk INC. Dba Weaver Electric Company | Denver | CO | Electrical Equipment, Appliance & Component Manufacturing335312 | — | ◇ UNVERIFIED |
| KCKeebler CO | Denver | CO | Food Manufacturing311821 | — | ◇ UNVERIFIED |
| KGKeyline Graphics INC | Denver | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| KCKiewit - Colorado Springs Asphalt Plant | Colorado Springs | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| KIKiewit Inf. - Portable Asphalt Plant | Englewood | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| KWKiewit Western | Littleton | CO | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| KCKind Coffee, LLC | Estes Park | CO | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| KSKing Soopers Print Shop | Denver | CO | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| KCKloppenberg & CO | Sheridan | CO | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| KPKnight Printing CO INC | Commerce City | CO | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
