automatylicza/esperanto-open-data

Esperanto open data (Esperantopedia)

Open data about Esperanto, published by Esperantopedia, the multilingual site about the Esperanto language. These are the same files as on https://esperantopedia.org/data/: statistics about speakers and the Esperanto movement, the World Esperanto Congresses since 1905, the official vocabulary of the Academy of Esperanto, word frequency, and the 1,000 most common Esperanto words with meanings in 23 languages.

Every table comes from a page of esperantopedia.org that explains the columns, the method and the sources (national censuses, reports of the Universal Esperanto Association, the Academy of Esperanto, Pasporta Servo, Wiktionary, Tatoeba and others). Disputed figures are given as ranges, and numbers have the date they refer to. The website is the primary source: when a source publishes new figures, the page and the file are updated together, and this dataset gets a new version.

Files

Statistics

File	Dataset	Rows	Columns	Documentation
esperanto-in-numbers.csv	Esperanto statistics: facts and figures with sources (1887–2026)	98	id, metric, value, value_low, value_high, unit, date, definition, method, source_title, source_url, checked	page
academy.csv	Elements in each BRO frequency group	9	Group, Elements, Running total	page
countries.csv	Individual UEA members by country, 2023 (top five)	5	Rank, Country, UEA individual members (2023)	page
official-esperanto.csv	Official roots added by each layer (Academy of Esperanto)	11	Layer, Year, New official elements	page
pasporta-servo.csv	Pasporta Servo hosts, 1974–2026	6	Year, Hosts, Countries, Note	page
word-origins.csv	Share of Esperanto roots for which Wiktionary names each language as a source	8	Language, Top 1,000 roots (%), All roots with data (%)	page
world-congress.csv	Participants at the World Esperanto Congresses, 1905–2026	113	No., Year, City, Country, Participants	page
common-words.csv	Share of all words in the corpus covered by the most common words	12	Most common words, Share of all words in the corpus (%)	page
exams.csv	People who passed the KER exams each year, 2008–2025	18	Year, Passed	page
vocabulary.csv	Share of the corpus covered by the most common words	7	Most common words, Share of the corpus (%)	page
census.csv	Esperanto in national censuses	5	Country, Census figure, Census year	page
congress-host-countries.csv	Countries that have hosted the World Esperanto Congress, 1905–2026	8	Country (today's borders), Congresses held, 1905–2026	page
speaker-estimates.csv	Published estimates of the number of Esperanto speakers	10	Estimate, Source, Year, Method, What it counts	page
online-course-learners.csv	Learners reported by online Esperanto courses	6	Platform, Figure, Date	page
esperanto-in-numbers.json	Esperanto statistics: facts and figures with sources (JSON with field definitions and sources)			page

The 1,000 most common Esperanto words

One CSV per language (esperanto-1000-common-words-<code>.csv; English: esperanto-1000-common-words.csv), languages: ca, cs, de, es, fi, fr, hu, id, it, ja, ko, nl, pl, pt, ro, ru, sk, sv, tr, uk, vi, zh, en. Columns: rank, word (Esperanto), part_of_speech, the meaning in the language of the file, per_million (frequency per million words). Method and sources: esperantopedia.org/learn/common-words/.

catalog.json lists all datasets with their pages, files, time coverage and dates (the same file as https://esperantopedia.org/downloads/data/catalog.json).

Format

UTF-8 CSV, comma-separated, first row = column names (in English). Numbers have no thousands separators (1494, not 1,494). Ranges and approximate values ("about 1,500") stay as text, exactly as on the page.

Licence and citation

CC BY-SA 4.0: you may share and adapt the data, also commercially, if you credit Esperantopedia and share adapted versions under the same licence. Please cite the page of the dataset you use, for example:

Esperantopedia (2026). Participants at the World Esperanto Congresses, 1905–2026. https://esperantopedia.org/about/world-congress/

or the whole collection:

Esperantopedia (2026). Esperanto open data (Esperantopedia). https://esperantopedia.org/data/

Updates and errors

Last update: 2026-11-05. Corrections are welcome through https://esperantopedia.org/contact/.