Spiritual Statistics is Magisterium AI's data tool for the Catholic Church. Ask in plain language and the AI returns a chart, a table, or a written summary grounded in primary statistical sources. This article walks through the country- and diocese-level data — the half-century-deep Vatican Statistical Yearbook and the Annuario Pontificio.

What is in the country and diocese database

Two layers of data live side-by-side:

• Country-level totals from the Annuarium Statisticum Ecclesiae (the Vatican Statistical Yearbook): an unbroken series of 51 annual snapshots from 1973 through 2023, covering roughly 235 countries.
• Diocese-level statistics from the Annuario Pontificio and related sources: roughly 2,800 jurisdictions (dioceses, archdioceses, eparchies, vicariates apostolic, military ordinariates, and more), with historical coverage back to about 1918 for many sees.

Each year and jurisdiction has dozens of metrics — Catholics, total population, percent Catholic, diocesan and religious priests, permanent deacons, male and female religious, parishes, seminarians, baptisms, confirmations, first communions, marriages, ordinations, schools, hospitals, welfare institutions, marriage-nullity processes, and more.

Asking a question

Open a new chat and type the question the way you would ask a researcher. The AI figures out which tables to read, which years to include, and whether to draw a chart.

How has the number of Catholics in Nigeria changed from 1973 to 2023?

Compare priests per Catholic across France, Italy, and Spain.

Show me the trend in adult baptisms in the United States over the last twenty years.

What is the percentage Catholic in every diocese of Brazil, most recent year?

If your question is ambiguous — for example, you ask about "new Catholics" without specifying baptisms vs. receptions — the AI will pick the closest defensible metric and tell you which one it used.

Reading a chart

Charts open inline in the chat. Hover over a series to see the year and value. Use the small controls above the chart to switch between line, bar, and stacked-bar views, change which countries or dioceses are shown, or download the data as a CSV.

Every chart shows its source year-range and the underlying table in the caption, so you always know the vintage of the figures.

Things to try

• Ask for a single number ("How many priests were there worldwide in 2023?").
• Ask for a comparison across a region ("Catholics per priest in every country of Sub-Saharan Africa, 2023").
• Ask for a historical trend ("Plot vocations to the priesthood in the Philippines, 1980 to today").
• Ask for a diocese ("Catholics, parishes, and priests in the Archdiocese of Boston over the last twenty years").
• Ask for a calculation the data does not pre-compute ("What share of the world's Catholics live in Latin America?").

Known gaps

A few notes about the underlying source material that may affect what you see:

• China and North Korea have no country-level rows in the Vatican Yearbook — Vatican publication does not include them. Diocese-level data and the Ecclesiastical Directory still cover Chinese sees.
• Some scan years (1985, 1991, 1995, 2004, 2010–2012) had imperfect OCR; certain tables may have sparser data than neighbouring years.
• The most recent diocese-level data is typically 2021–2022 for most jurisdictions.

The four databases behind Spiritual Statistics

Magisterium AI ships with four distinct Catholic datasets. The chat picks the right one (or combines several) based on your question — you do not need to specify which to use.

• Catholic statistics on countries and dioceses — the Vatican Statistical Yearbook (Annuarium Statisticum Ecclesiae) and Annuario Pontificio. 51 annual snapshots from 1973–2023, covering ~235 countries and ~2,800 ecclesiastical jurisdictions worldwide.
• Saints database — over 12,500 saints, blessed, venerables, and servants of God with biographical detail, canonization status, feast days, and patronages.
• Ecclesiastical Directory — popes, living and historical bishops, cardinals, religious orders, basilicas, cathedrals, shrines, conclaves, consistories, ecumenical councils, apostolic nunciatures, bishops' conferences, pontifical universities, and Roman Curia departments.
• Church financial records — audited financial figures for ~630 dioceses, archdioceses, eparchies, and Holy See bodies (Holy See, APSA, IOR, Bambino Gesù), including total revenue, expenses, net assets, Peter's Pence, annual appeals, and ~1,300 other metrics.

Limits and access

Free accounts can run three Spiritual Statistics queries per week and twenty data visualisations (charts) per week. Pro, Org, and Enterprise plans get unlimited Spiritual Statistics and unlimited data visualisations.

All four datasets are queried through the same chat tool. If the AI cannot find what you asked for, it will say so plainly — it does not invent figures, and every chart or profile is grounded in a row that exists in the database.