| 1967- -010 State Route 266 | N/A | N/A | N/A | ABANDON PORTION OF S.R. 266 IN GRAHAM COUNTY. |
| 1962- -031 State Route 266 | N/A | N/A | N/A | ESTABLISH AS STATE HWY. FROM AT FT.GRANT -SW 3 MILES. |
| 1961- -113 State Route 266 | N/A | N/A | N/A | RELOCATE PORTION OF HWY FROM 14 MI. EAST OF BONITA -EAST 5 1/4 MI. TO JCT US 666. |
| 1961- -112 State Route 266 | N/A | N/A | N/A | RELOCATE PORTION OF HWY FROM BONITA -EAST 10 MILES. |
| 1960- -103 State Route 266 | N/A | N/A | N/A | RELOCATE PORTION OF HWY FROM EAST LN SEC.17, T10S, R25E WEST TO WEST LN OF SEC.12, T10S, R24E. |
| 1960- -077 State Route 266 | N/A | N/A | N/A | RELOCATE PORTION OF HWY IN CORONADO NATIONAL FOREST. |
| 1958-P-065 State Route 266 | N/A | N/A | N/A | REDESIGNATE FROM STATE ROUTE TO STATE HIGHWAY |
| 1957-P-386 State Route 266 | N/A | N/A | N/A | DESIGNATE HWY AS STATE ROUTE FROM FT. GRANT IN SEC.25, T9S, R23E EAST TO S.R.666 IN SEC.4, T10S, R26E |