Total population counts at national level, mid-year estimate in millions of people, with annual time steps. Countries and other territories are identified by ISO 3166-1 code. Data is harmonized to a single delineation of boundaries reflecting actual present-day availability of statistical data.
This dataset was created in Horizon Europe project COMPASS (https://compass-climate.eu/) Data was compiled and harmonized from multiple sources: (a) 1850-1949 from a new compilation of historical population, adjusted to modern country boundaries made in COMPASS D3.1 [1]. (b) 1950-2023 from United Nations World Population Prospects 2024 [2] with minor adjustments made in COMPASS D3.1. (c) 2025-2100 extrapolated from 2020 with gap-filled SSP v3.2 data [3], and 2024 interpolated between 2023 and 2025. Input data, code and documentation (including detailed sources) is available on Zenodo [1] and will be further documented in a forthcoming journal publication.
[3] KC, S. (2026) SSP Population and Human-Capital Projections, 2025-Rebased, 2025-2100 (zen2025V01) [dataset]. Zenodo. https://doi.org/10.5281/zenodo.21738149
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