Sao Tome and Principe

Sao Tome and Principe is a small island nation in the Gulf of Guinea, off the western equatorial coast of Central Africa. The stable classification facts come first, followed by a method for verifying volatile figures on inhabitants, languages, money, state structure, the economy and travel requirements without freezing outdated numbers into your research. The goal is a reliable starting point, not a final answer, because every statistic has a source, a method and a reference year.

Classification facts (stable)

The following identifiers are stable and come from the United Nations Statistical Commission’s M49 standard, the international reference for statistical area coding.

• UN M49 code: 678
• ISO alpha-2: ST
• ISO alpha-3: STP
• UN region: Africa
• UN subregion: Sub-Saharan Africa
• UN member state: Yes
• World Bank capital field: Sao Tome

These codes classify the territory for statistical purposes. They are not political statements about sovereignty or territorial claims. The M49 overview is maintained by the UN Statistics Division and is the authoritative source for regional groupings.

How to verify current facts without freezing volatile figures

Inhabitants, languages, money, state structure and visa rules change. Instead of quoting a single number as fixed truth, use these primary sources and note the reference year for each figure.

• World Bank country API returns the country code, region, income level and capital city as recorded by the World Bank. The data includes the reference year for many indicators. Use this for economic classifications and basic country metadata.
• United Nations M49 overview is the authoritative source for statistical classifications: UN region, subregion and country codes. It is a statistical framework, not a political or territorial claim.
• National Statistical Office of São Tomé and Príncipe, the primary source for census and survey data. For current inhabitant estimates, check the most recent census report or the latest official projection.
• WHO, use for health statistics, life expectancy and disease burden. Their country profiles cite the reference year for each indicator.
• World Bank, use for income classification, GDP and development indicators; the API link above returns a machine-readable list of all territories and their metadata.
• CIA World Factbook, use as a secondary compilation, but verify primary figures against UN, World Bank or national statistical office releases.
• IMF, use for economic outlook and GDP projections; clearly distinguish projections from historical estimates.

Inhabitants

• Open the United Nations World Population Prospects dashboard or the World Bank country page for Sao Tome and Principe.
• Note the reference year for the estimate (for example, 2023 or 2024 revision).
• Do not expect a single “true” number; the UN, World Bank and national statistics office often differ by small margins due to different projection methods and census timing.
• Cite the source and year whenever you quote a figure.

Capital

• The capital is Sao Tome. Confirm the capital field in the World Bank country API, which returns “Sao Tome” in the capitalCity field for country code STP.
• Do not confuse the capital city with the nation’s name or the larger island of Sao Tome.

Money

• The unit is the Dobra (STN). The Central Bank of Sao Tome and Principe (Banco Central de São Tomé e Príncipe) issues it. Exchange rates change daily; check a current converter or the central bank for the official rate. For historical series, the IMF and World Bank publish annual averages in their databases.
• The Dobra was redenominated in 2018 (1 new Dobra = 1,000 old Dobras, ISO code STN replacing STD). Source: Banco Central de São Tomé e Príncipe.

Languages

• Portuguese is the official language (Constitution of Sao Tome and Principe). Forro, Angolar and Principense are recognized regional languages. For current language statistics, consult Ethnologue or the São Tomé and Príncipe national statistics office. For practical communication, the CIA World Factbook summarises language use, but treat proportions as estimates.

State structure

• The CIA World Factbook lists Sao Tome and Principe as a semi-presidential republic. The President is head of state; the Prime Minister is head of government. Verify current leadership and cabinet composition from the Presidency and National Assembly sources, not from static profiles.

Economy

• The World Bank classifies Sao Tome and Principe as a lower-middle-income territory (FY2025 classification, based on 2023 GNI per capita). Cocoa accounts for most exports. The economy is small, island-based and dependent on agriculture, tourism and development aid. Oil exploration remains prospective, not proven at scale. For current GDP, growth and poverty data, use the World Bank country API. Always note the reference year of the dataset.

Travel and safety

• Visa and entry rules change frequently and depend on the traveller’s nationality. Check the official website of the Ministry of Foreign Affairs of Sao Tome and Principe, the travel advisory of your own nation (UK Foreign Travel Advice, US State Department or equivalent) and the IATA Travel Centre, a neutral source for air travel entry requirements.

Flag description

• The flag has three horizontal stripes: green at the top and bottom, yellow in the middle with two black stars, and a red triangle at the hoist. Source: CIA World Factbook (accessed 2025).

Primary reference URLs

• Population: UN World Population Prospects dashboard or World Bank country page.
• Capital: Sao Tome. World Bank capital field: Sao Tome. (Reference: World Bank country API.)
• Money: Dobra (Db), ISO code STN since 2018 redenomination. Source: Banco Central de São Tomé e Príncipe.
• Languages: Portuguese (official); Forro, Angolar, Principense creoles. Source: Ethnologue or CIA World Factbook, year varies.
• State structure: Unitary semi-presidential republic. Source: CIA World Factbook, 2024.
• Economy: Lower-middle-income (World Bank FY2025 classification, based on 2023 GNI per capita). Cocoa is the dominant export. Source: World Bank, 2023.
• Travel: IATA Travel Centre for air travel entry requirements; Ministry of Foreign Affairs of Sao Tome and Principe for visa policy.