| | | | Short Title | | Yes | | No | | Outcome | | Type of Change | |
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| Referendum |
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| | 1 | | An amendment to section 22 of article IV of the constitution of the State of Colorado, exempting the heads of principal departments establis | | 57% | | 42% | | Adopted | | Constitutional | |
| | 2 | | An amendment to article XII of the constitution of the State of Colorado, creating the Colorado state personnel system, providing therein fo | | 66% | | 33% | | Adopted | | Constitutional | |
| | 3 | | An amendment to articles XI, XIV, and XX of the constitution of the State of Colorado, relating to local government, and providing for home | | 65% | | 34% | | Adopted | | Constitutional | |
| | 4 | | An amendment to article VII of the constitution of the State of Colorado, reducing the minimum age and residency requirements of electors an | | 45% | | 54% | | Rejected | | Constitutional | |
| | 5 | | An amendment to article VII of the constitution of the State of Colorado, changing the residency qualification of electors, and providing th | | 64% | | 35% | | Adopted | | Constitutional | |
| 1968 |
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| | 1 | | An Amendment to Article IV of the Constitution of the State of Colorado, providing for the election of the Governor and Lieutenant Governor | | 67% | | 32% | | Adopted | | Constitutional | |
| | 2 | | An Amendment to Article X of the Constitution of the State of Colorado, relating to the exemption of publicly owned real property from taxat | | 47% | | 52% | | Rejected | | Constitutional | |
| | 3 | | An Amendment to Article XIV of the Constitution of the State of Colorado, relating to the compensation of county officers. | | 51% | | 48% | | Adopted | | Constitutional | |
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|
| Initiative |
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| | 3 | | An Amendment to Article VI of the Constitution of the State of Colorado, concerning the Judicial Department, and providing for the selection | | 52% | | 47% | | Adopted | | Constitutional | |
| | 4 | | An Act to amend Article V of the State Constitution, providing for a Senate of not more than thirty-five members and a House of Representati | | 70% | | 29% | | Adopted | | Constitutional | |
| | 5 | | An Amendment to Article X of the Constitution of the State of Colorado concerning the General Property Tax, establishing a maximum limitatio | | 31% | | 68% | | Rejected | | Constitutional | |
|
| Referendum |
| |
| | 1 | | An Amendment to Article IV of the Constitution of the State of Colorado, by the addition of a new section 22, providing that executive and a | | 69% | | 30% | | Adopted | | Constitutional | |
| | 2 | | An Amendment to Section 6 of Article X of the Constitution of the State of Colorado, providing for classification of self-propelled equipmen | | 60% | | 39% | | Adopted | | Constitutional | |
| | Ref 1 | | Providing for daylight saving time in Colorado. | | 57% | | 42% | | Adopted | | Statutory | |
| | Ref 2 | | Shall Capital Punishment be abolished? | | 33% | | 66% | | Rejected | | Statutory | |
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|
| Referendum |
| |
| | 1 | | An Amendment to Articles IV and V of the Constitution of the State of Colorado providing for a State Auditor under the Legislative Departmen | | 63% | | 36% | | Adopted | | Constitutional | |
| | 2 | | An Amendment to Article IX of the Constitution of the State of Colorado providing that the Office of County Superintendent of Schools may be | | 63% | | 36% | | Adopted | | Constitutional | |
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| Initiative |
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| | 7 | | Providing for the apportionment of the General Assembly and providing for senatorial and representative districts | | 63% | | 36% | | Adopted | | Constitutional | |
| | 8 | | Relating to reapportionment, including a commission on legislative apportionment | | 32% | | 67% | | Rejected | | Constitutional | |
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