# Esperanto data: open datasets to download and cite

Source: https://esperantopedia.org/data/
Language: en
Updated: 2026-11-09

> Open data about Esperanto in CSV and JSON: speakers, World Congresses, UEA members, Pasporta Servo hosts, KER exams and common words. Free to reuse.

Esperantopedia publishes the data behind its pages as **open datasets**: statistics about speakers and the Esperanto movement, the World Congresses since 1905, the official vocabulary and word frequency. Every table links to a page that explains the columns, the method and the sources. All files are free to reuse under the licence **CC BY-SA 4.0**.

## All datasets

| Dataset | Download | Updated |
|---|---|---|
| [Esperanto statistics: facts and figures with sources (1887–2026)](https://esperantopedia.org/about/esperanto-in-numbers/) | [CSV](/downloads/esperanto-in-numbers.csv) · [JSON](/downloads/esperanto-in-numbers.json) | 2026-11-05 |
| [1000 most common Esperanto words – list and download](https://esperantopedia.org/learn/common-words/) | [CSV](/downloads/esperanto-1000-common-words.csv) · [Anki](/downloads/esperanto-1000-common-words-anki.txt) | 2026-10-11 |
| [Elements in each BRO frequency group](https://esperantopedia.org/about/academy/) | [CSV](/downloads/data/academy.csv) | 2026-10-11 |
| [Individual UEA members by country, 2023 (top five)](https://esperantopedia.org/about/countries/) | [CSV](/downloads/data/countries.csv) | 2026-10-11 |
| [Official roots added by each layer (Academy of Esperanto)](https://esperantopedia.org/about/official-esperanto/) | [CSV](/downloads/data/official-esperanto.csv) | 2026-10-11 |
| [Pasporta Servo hosts, 1974–2026](https://esperantopedia.org/about/pasporta-servo/) | [CSV](/downloads/data/pasporta-servo.csv) | 2026-10-07 |
| [Share of Esperanto roots for which Wiktionary names each language as a source](https://esperantopedia.org/about/word-origins/) | [CSV](/downloads/data/word-origins.csv) | 2026-10-29 |
| [Participants at the World Esperanto Congresses, 1905–2026](https://esperantopedia.org/about/world-congress/) | [CSV](/downloads/data/world-congress.csv) | 2026-10-07 |
| [Share of all words in the corpus covered by the most common words](https://esperantopedia.org/learn/common-words/) | [CSV](/downloads/data/common-words.csv) | 2026-10-11 |
| [People who passed the KER exams each year, 2008–2025](https://esperantopedia.org/learn/exams/) | [CSV](/downloads/data/exams.csv) | 2026-10-29 |
| [Share of the corpus covered by the most common words](https://esperantopedia.org/learn/vocabulary/) | [CSV](/downloads/data/vocabulary.csv) | 2026-10-11 |
| [Esperanto in national censuses](https://esperantopedia.org/about/countries/) | [CSV](/downloads/data/census.csv) | 2026-10-11 |
| [Countries that have hosted the World Esperanto Congress, 1905–2026](https://esperantopedia.org/about/countries/) | [CSV](/downloads/data/congress-host-countries.csv) | 2026-10-11 |
| [Published estimates of the number of Esperanto speakers](https://esperantopedia.org/about/speakers/) | [CSV](/downloads/data/speaker-estimates.csv) | 2026-10-11 |
| [Learners reported by online Esperanto courses](https://esperantopedia.org/about/speakers/) | [CSV](/downloads/data/online-course-learners.csv) | 2026-10-11 |

The same files are also available as a dataset on [Hugging Face](https://huggingface.co/datasets/automatylicza/esperanto-open-data) and [Kaggle](https://www.kaggle.com/datasets/automatylicza/esperanto-open-data).

## How to use and cite the data

You may copy, share and adapt the data, also commercially, if you credit the source and share your version under the same licence, [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/). Please cite the page of the dataset, for example:

> Esperantopedia (2026). *Esperanto statistics: facts and figures with sources*. https://esperantopedia.org/about/esperanto-in-numbers/ (retrieved 9 November 2026).

The CSV files use UTF-8, commas between columns and plain numbers without thousands separators (1494, not 1,494). Ranges and approximate values ("about 1,500") stay as text, exactly as on the page. Column names are in English; the page of each dataset explains them in your language. Programs can read the list of all files from [catalog.json](/downloads/data/catalog.json).

## Where do the numbers come from?

Each dataset comes from a page that lists its sources at the end: national censuses, reports of the Universal Esperanto Association, the Academy of Esperanto, Wiktionary, Tatoeba, Pasporta Servo and others. Disputed figures are given as ranges, and every number has the date it refers to. When a source publishes new figures, we update the page and the file together and change the date. If you find an error, please [write to us](https://esperantopedia.org/contact/).

## Common questions

### Is the data free to use?

Yes. You can use it in articles, research, apps and teaching materials, also commercially, as long as you credit Esperantopedia and share adapted versions under CC BY-SA 4.0.

### Can I use the data in another language?

Yes. The numbers are the same in every language version of the site; only the names of the columns in the CSV files are in English. Each dataset page in your language explains what the columns mean.

### How often is the data updated?

When a source publishes new figures, for example a new report of the Universal Esperanto Association or a new World Congress. The "Updated" column shows when each dataset was last updated.

## Sources

- Universal Esperanto Association, [Estrara Raporto 2023](https://esperantohea.hu/wp-content/uploads/2024/10/Estrara_Raporto_2023_UEA.pdf) (membership); Vikipedio, [Membronombroj de UEA](https://eo.wikipedia.org/wiki/Membronombroj_de_UEA)
- Universal Esperanto Association, [list of World Congresses](https://uea.org/kongresoj/listo) and [congress pages](https://uea.org/kongresoj)
- [Pasporta Servo](https://pasportaservo.org/) (host numbers, 2026)
- edukado.net: [UEA-KER exams](https://edukado.net/ekzamenoj/ker)
- [Akademio de Esperanto – Akademia Vortaro: Klarigoj (statistics)](https://www.akademio-de-esperanto.org/akademia_vortaro/klarigoj.html)
- [Akademio de Esperanto – Baza Radikaro Oficiala (Aktoj II, 1968–1974)](https://www.akademio-de-esperanto.org/aktoj/aktoj2/bro.html)
- [Wiktionary: Frequency lists/Esperanto/Tekstaro 2023 (CC BY-SA 4.0)](https://en.wiktionary.org/wiki/Wiktionary:Frequency_lists/Esperanto/Tekstaro_2023)
- Amri Wandel, ["How many people speak Esperanto? Or: Esperanto on the Web"](https://doi.org/10.7906/indecs.13.2.9), *Interdisciplinary Description of Complex Systems* 13(2), 318–321, 2015