Population-only isolated time series for one country

GET

/api/v1/research/maddison/population

Last modified:2026-05-10 09:22:39

Maintainer:Not configured

OperationId:research_maddison_population

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.

Request

Authorization

API Key

Add parameter in header

x-api-key

Example:

x-api-key: ********************

Query Params

Header Params

Request Code Samples

Shell

JavaScript

Java

Swift

PHP

Python

HTTP

Objective-C

Ruby

OCaml

Dart

curl --location '/api/v1/research/maddison/population?iso3=USA&start_year=1820&end_year=2022' \
--header 'x-api-key: <api-key>'

Responses

🟢200

application/json

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

Bodyapplication/json

Example

{
    "data": {
        "iso3": "USA",
        "country": "string",
        "region": "string",
        "region_slug": "string",
        "unit": "thousands of people",
        "observations": [
            {
                "year": 2022,
                "population_thousands": 334805
            }
        ],
        "count": 100,
        "start_year": 0,
        "end_year": 0
    },
    "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": "string",
        "fallback_used": true,
        "fallback_chain": [
            "string"
        ],
        "cached": true
    }
}

🟠401

🟠422

🟠429

🔴503

Modified at 2026-05-10 09:22:39

Top N countries by GDP per capita or population for a year

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