| 1 | TOZI | TWO ONE ZERO ZERO EIGHT SEVEN TWO ( | | | SCAC4 |
| 2 | TOZO | TRANSPORTES OROZCO (MX-255754) | | | SCAC4 |
| 3 | TOZS | THREE ONE ZERO FIVE ZERO | | | SCAC4 |
| 4 | TOZV | TWO ONE ZERO TWO NINE SEVEN THREE ( | | | SCAC4 |
| 5 | TOZX | Eureka Springs Water Co. | 7/1935-1/1946 | | NAKINA |
| 6 | TOZX | Ozarka Co. | added 4/1958; 4/1961; eliminated 7/1962 | | NAKINA |
| 7 | TOZX | Ozarka Water Co., Inc. | added 7/1962; 7/1965-10/1966; eliminated 4/1967 | | NAKINA |
| 8 | TOZX | Ozarka Water Co. | added 4/1967; 4/1970; eliminated 7/1972 | | NAKINA |
| 9 | TOZX | Eureka Springs Water Co. | Apr-38 | | NRHS |
| 10 | TOZX | Ozarka Co. | Apr-61 | | NRHS |
| 11 | TOZX | Ozarka Water Co., Inc. | 7/65-10/66; eliminated 4/67 | | NRHS |
| 12 | TOZX | Ozarka Water Co. | added 4/67; 4/70 | | NRHS |
| 13 | TOZX | OZARKA WATER CO. [EUREKA SPRINGS WATER CO.] | | | PWRC |
