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v5

latestOpenAPI 3.1.0Proprietary2026-08-031,5423,1505.5 MB
Research

Population-only isolated time series for one country

Returns a lean population-only time series for one ISO 3166-1 alpha-3 coded country. Population is in thousands of people (multiply by 1000 for persons). Rows with no population observation are omitted, so every returned row has a non-null value. For the paired GDP-per-capita + population series use /country/{iso3}. Published under CC BY 4.0 by Bolt and van Zanden at the University of Groningen.

get/api/v1/research/maddison/population

Query parameters

iso3string required

ISO 3166-1 alpha-3 country code. Case-insensitive; normalised to uppercase.

ISO 3166-1 alpha-3 country code. Case-insensitive; normalised to uppercase.

start_yearinteger nullable

Inclusive start year (integer).

Inclusive start year (integer).

end_yearinteger nullable

Inclusive end year (integer). Defaults to 2022.

Inclusive end year (integer). Defaults to 2022.

Response

Year-ordered population observations (thousands) for one country.

Example response

{
  "data": {
    "iso3": "USA",
    "country": "United States",
    "region": "Western Offshoots",
    "region_slug": "western-offshoots",
    "observations": [
      {
        "year": 2022,
        "population_thousands": 334805
      }
    ],
    "count": 100,
    "start_year": 1820,
    "end_year": 2022
  },
  "meta": {
    "endpoint": "/api/v1/fred/us/cpi",
    "data_time": "2026-04-16T14:30:00Z",
    "response_time": "2026-04-16T14:30:12Z",
    "provider": "Sugra API v1.0.1",
    "source": "sugra_crypto",
    "attribution": "Short interest and Reg SHO daily short volume data is owned by and sourced from FINRA (Financial Industry Regulatory Authority).",
    "fallback_chain": [
      "sugra_crypto",
      "sugra_finance"
    ]
  }
}