U.S. Constitutional Amendments and Ratification Dates
Amendments to the U.S. Constitution with their numbers and dates of ratification, rather than proposal.
Download optionsThe records
The 10 most recently added of 27 records · Select a column heading to sort.
| ID | Amendment number | Ratification date |
|---|---|---|
| 18 | 18 | 1919-01-16 |
| 19 | 19 | 1920-08-18 |
| 20 | 20 | 1933-01-23 |
| 21 | 21 | 1933-12-05 |
| 22 | 22 | 1951-02-27 |
| 23 | 23 | 1961-03-29 |
| 24 | 24 | 1964-01-23 |
| 25 | 25 | 1967-02-10 |
| 26 | 26 | 1971-07-01 |
| 27 | 27 | 1992-05-07 |
Free sample files (up to 10 rows): CSV JSON XML
Scope and sources
Last checked against sources: October 16, 2026.
Last changed: October 10, 2026. This is when we last changed the data or its description. It doesn’t mean the data runs up to that date.
- National Archives, The Bill of Rights: A Transcription
- National Archives, The Constitution: Amendments 11–27
A complete download includes all 27 records currently held in this dataset. Check the description and sources to decide whether its scope fits your project.
Use this dataset through the API
GET https://mysafeinfo.com/api/data/usconstitutionalratificationChoose a format, sort, or request fewer rows. A pass key gives access to the complete dataset. See the examples and parameters.
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