| cakes | candy | candy retail |
| carpentry work | carpet & rug dealers | carpet cleaners |
| carpet cleaning | car polishing | car rental |
| car washes | car washing | cash register |
| cash supplies | catalog | caterers |
| cellular telephones | cellular telephone service | cement |
| cemetery | certified public accountants | cheap hotels |
| check cashing services | child care services | child day care services |
| children's clothing | chinese restaurant | chiropractic clinic |
| chiropractor | christian school | churches |
| cigarette | cigars | civic associations |
| civil engineers | cleaners | clinic |
| clinical psychologists | clinics of chiropractors | clinics of dentists |
| clinics of medical doctors | clocks | coal |
| coating manufacturer | coatings | coin-operated amusement devices |
| coins | collection agency | college |
| colon rectal surgeons | colon surgeons | commercial art |
| commercial banks | commercial lighting fixtures | commercial photography |
| commercial printing | commodity brokers | commodity dealers |
| commodity exchange | commodity services | communication services |
| component retail | computer consultants | computer integrated systems design |
| computer maintenance | computer related services | computer repair |
| computer services | computers system designers | computer storage devices |
| computer stores | computer technology schools | computer training schools |
| concrete blocks | concrete contractors | concrete products |
| concrete work | confectionery | confectionery retail |
| construction management | construction materials | consulting engineers |
| convalescent homes | conveyor equipment | copier repair |
| copiers | corrugated boxes | cosmetic dentist |
| cosmetic dentistry | courier service | court |
| court reporting | crating | credit union |
| crematory | criminal law attorney | croissant |
| curtains |
