Mark's Locksmith
| Cable Lock | 1098M, 1528 | |
| Calmet | 1179, 1022 | |
| Camel | Honk Kong padlock | 1000V, 1046 |
| Campbell Chain | 1069N | |
| Campers | See specific name | |
| Canada Post | 1003M, P54F, 752, 1558, 1594 | |
| Canada Builder | 25 | |
| Capp | 1054K | |
| Caravelle | O1122 | |
| Carmel Steel Products | 1145 | |
| Cat | padlocks | X1000FR, 1092, 999, 192 |
| Caterpillar | earth movers | 1560, OKB171 |
| Cavalier | chest, trunk | 1069N, 1069W |
| CCL | Corbin Cabinet Lock | See Ilco #60 |
| Cemex | 1548, 1549, 1550 | |
| Center | padlock | 1041E |
| CES | profile cylinders | 1145, 999 |
| Cessna | aircraft | C1054B, O1122, O1122B |
| Cessna | desk lock | O1122 |
| Champ | portable lift | IN29 |
| Challenger | aka Hollymade | 1170, and see Ilco #60 |
| Change-O-Matic | 1000V | |
| Channell | padlock | X12 |
| Chateau | 997ER, 997EB | |
| Checker auto | taxicab | 1098M |
| Chesler | 1014, 1127ES, 1127DP, O1122, 1178 | |
| Chester | RV | 1127ES |
| Chevy van | 1041T | |
| Cheyenne | RV | 1069N |
| Chicago | See Ilco #60 | |
| Chicago | freezer lock | 1069N |
| Chicago patio door | O1122 | |
| Chrysler boats | See Ilco #60 | |
| Chuckamkee | 62CKK | |
| Cisa padlocks | See Ilco #60 and: | 1079, 1016, O1122, 997E |
| Clark | fork lift | 1430 |
| Classic | thermostat | 1541 |
| Clinton | See Ilco #60 | |
| Clocks | wind-up keys | 669 |
| Clopay | aka DNS | X1014F, X1014L, O1122, 1069L, 1537 |
| Club | steering wheel lock | CB1, CB2, CB3, CB4, ... |
| Clubcar | golf cart | 1098JD, X90 |
| Clum | mostly boats | See Ilco #60 |
| Coachman | RV, trailers | Same as Bargman |
| Cobra Trailer | 1041E | |
| Cole Hersee (Hersey) | 1098M, O1122, O1122A, O1122AR | |
| Compactor | Trash compactors | 1000V, O1122 |
| Concord | 1079, 1022 | |
| Console | cam lock, GM vans etc. | 15335 from Howard Keys, 1-800-524-9199 sub S1003M |
| Cool Vent | Tool sheds | 1000V, O1122 |
| Corey Jamestown | R1064E, 1069N, O1122, O1122A | |
| Craftsman | aka Sears | See Ilco #60 (under Elgin) |
| Craftsman | Tool box | 1098M, 1041N, 1041E, 1041T |
| Craftsman | Tool box | O1122A, O1122AR, R1096EN, 1605 |
| Crawford door | 1176 | |
| Crook Bar | 1098M, 6FS, 1125A | |
| CRS | trailer ball lock | X132 |
| Cruzval | brake lock | PA6 |
| Cutler Federal | mailbox | L1003M, 1181C |
| Cypher | 1041T |