History · Reference dataset
NATO Member Countries
Member countries of the North Atlantic Treaty Organization, with the year each joined the alliance.
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The 10 most recently added of 32 records · Select a column heading to sort.
| ID | Country | Year joined |
|---|---|---|
| 23 | Lithuania | 2004 |
| 24 | Romania | 2004 |
| 25 | Slovakia | 2004 |
| 26 | Slovenia | 2004 |
| 27 | Albania | 2009 |
| 28 | Croatia | 2009 |
| 29 | Montenegro | 2017 |
| 30 | North Macedonia | 2020 |
| 31 | Finland | 2023 |
| 32 | Sweden | 2024 |
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Scope and sources
Last checked against sources: October 16, 2026.
Last changed: October 16, 2026. This is when we last changed the data or its description. It doesn’t mean the data runs up to that date.
A complete download includes all 32 records currently held in this dataset. Check the description and sources to decide whether its scope fits your project.
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GET https://mysafeinfo.com/api/data/natomembercountriesChoose 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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