---
title: "Finnish population, 1750 onwards"
method: GET
path: "/api/v1/stat-finland/population"
tags: ["Statistical Agencies"]
---

# Finnish population, 1750 onwards

`GET /api/v1/stat-finland/population`

Annual Finnish population at 31 December and the annual change series, from `vaerak/statfin_vaerak_pxt_11rb.px`. The table covers 275 years of history. To protect against 100K-cell PxWeb limits requesters must pick a sensible `last_n` window; there is no way to retrieve the whole series in one call at high fidelity.

## Query parameters

- `last_n` integer — Number of most-recent years to return (upstream covers 1750-).
- `sex` string — Sukupuoli code. `SSS` total, `1` males, `2` females.
- `indicator` string — Tiedot code. `vaesto` = population; `kokmuutos` = annual change.

## Response `200`

Annual population observations at 31 December.

- EnvelopeStatFinPopulationPayload
  - `data` StatFinPopulationPayload, required
    - `table_id` string, required — PxWeb table identifier.
    - `indicator` string, required — Tiedot code. `vaesto` is the year-end population count.
    - `sex` string, required — Sukupuoli code included in the query.
    - `observations` StatFinPopulationObservation[], required — Annual population observations (1750-).
      - `period` string, required — PxWeb period code as returned upstream: `YYYYMnn` for months, `YYYYQn` for quarters, `YYYY` for years.
      - `time` string, nullable — ISO-8601 UTC timestamp for the first day of the period (months -> first day of month, quarters -> first day of quarter, years -> Jan 1).
      - `value` number, nullable — Parsed numeric value. `null` when upstream value is `.` or `..` (suppressed or missing).
      - `value_raw` string, nullable — Raw value string as delivered by PxWeb; useful for debugging.
      - `Sukupuoli` string, nullable — Sex dimension. `SSS` total, `1` males, `2` females.
    - `count` integer, required — Number of observations returned.
    - `metadata` StatFinMetadata — Raw metadata block copied from PxWeb.
      - `updated` string, nullable — Upstream last-updated timestamp, normalised to ISO-8601 UTC (PxWeb delivers dot-separated time like `2026-04-14T05.00.00Z`; Sugra replaces the dots with colons).
      - `label` string, nullable — Human-readable table label.
      - `source` string, nullable — Source attribution string as delivered by Statistics Finland.
  - `meta` SugraMeta, required — Metadata attached to every /api/v1/* response envelope.
    - `endpoint` string, required — Requested endpoint path.
    - `data_time` string, required — ISO 8601 UTC timestamp of the source data, not of the request.
    - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced.
    - `provider` string, required — API name and version.
    - `source` string, nullable — Identifier of the primary upstream source used for this response.
    - `attribution` string, nullable — Human-readable attribution mandated by an upstream source (e.g. a securities regulator or self-regulatory organization). Present only on responses whose source requires the owner and source to be clearly identified. Do not remove or alter it when using the response.
    - `fallback_used` boolean, nullable — True when the primary source failed and a fallback produced the data.
    - `fallback_chain` string[], nullable — Ordered list of sources attempted, in the order they were tried.
    - `cached` boolean, nullable — True when this response was served from the internal cache.
    - `stale` boolean, nullable — True when the cached response was returned after the upstream rate-limited or errored. Clients can use this to detect degraded data.

## Other responses

- `401` — Missing or invalid `x-api-key` header. JSON body with a stable `code` distinguishing `missing_api_key` (no header sent) from `invalid_api_key` (header sent, key not accepted); any other 401 source carries the generic `unauthorized` with its detail as `reason`. Plus `hint`. `plan` is always null on 401 - an unauthenticated request has no plan; quota exhaustion is 429, not 401.
- `422` — Validation Error
- `429` — Daily rate limit exceeded. Check `X-RateLimit-Reset` for the next window.
- `503` — Upstream source is temporarily unavailable. Retry after a short delay.

---

[API](https://skmtc.net/sugra/apis/sugra-api.md) · [All operations](https://skmtc.net/sugra/apis/sugra-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/sugra/sugra-api/versions/d3e3d9c28132/schema)