| 2102 | Cans, fibre (i.e., fibre body, ends of any material), made from purchased paperboard | |
| 2899 | Cans, metal (e.g., food, beverage, aerosol), manufacturing | |
| 0112 | Cantaloup and other melon farms | |
| 0112 | Cantaloup farms | |
| 5520 | Canteen truck | |
| 5520 | Canteens, mobile food services | |
| 2010 | Cants, resawed (lumber), manufacturing | |
| 1721 | Canvas bags, manufacturing | |
| 1729 | Canvas board, artists', manufacturing | |
| 1711 | Canvas fabrics (more than 30 cm/12 in. wide), weaving | |
| 1721 | Canvas products (except bags), made from purchased canvas or canvas substitutes | |
| 1721 | Canvas products, made from purchased canvas or canvas substitutes | |
| 1920 | Canvas shoes, manufacturing | |
| 1729 | Canvases, artists', prepared on frames, manufacturing | |
| 5259 | Canvassers (door-to-door), headquarters for retail sale of merchandise | |
| 3210 | Capacitors (except electronic), fixed and variable, manufacturing | |
| 5150 | Capacitors (except electronic), wholesale | |
| 3210 | Capacitors, a.c., for motors and fluorescent lamp ballasts, manufacturing | |
| 3210 | Capacitors, electronic, fixed and variable, manufacturing | |
| 5150 | Capacitors, electronic, wholesale | |
| 1810 | Capes (except fur, leather, waterproof), girls', cut and sewn from purchased fabric | |
| 1810 | Capes (except fur, leather, waterproof), women's and misses', cut and sewn from purchased fabric | |
| 1820 | Capes, fur, manufacturing | |
| 2519 | Capes, waterproof (e.g., plastics, rubber, similar materials), cut and sewn from purchased fabric | |
| 0122 | Capon farming | |
| 0140 | Caponizing service | |
| 2919 | Capping, sealing and lidding packaging machinery, manufacturing | |
| 2411 | Caprolactam, manufacturing | |
| 1810 | Caps and gowns, academic, cut and sewn from purchased fabric | |
| 5131 | Caps and gowns, women's and children's, wholesale | |
| 1810 | Caps and hats (except fur, leather), made from purchased fabric | |
| 3120 | Caps and plugs, attachment, electric, manufacturing | |
| 2899 | Caps and tops, bottle, metal, stamping | |
| 3420 | Caps for pickup trucks, manufacturing | |
| 2429 | Caps for toy pistols, manufacturing | |
| 2429 | Caps, blasting and detonating, manufacturing | |
| 2927 | Caps, bomb, manufacturing | |
| 1820 | Caps, fur, manufacturing | |
| 1920 | Caps, heel and toe, leather, manufacturing | |
| 2899 | Caps, heel and toe, metal, manufacturing | |