Where does this data come from?

Name: Population (1 January) — Siena (NUTS-3 ITI19)
Creator: Eurostat (Statistical Office of the European Union)

It is collected directly from Eurostat (Statistical Office of the European Union) and is available through the Makrognosis API under the code IT-I19.POP.A.NSA.

Population (1 January) — Siena (NUTS-3 ITI19)

AnnualNot seasonally adjustedCode IT-I19.POP.A.NSA

Latest259,460 persons2025

Previous259,992 persons2024

Year ago259,992 persons2024

Population (1 January) — Siena (NUTS-3 ITI19) was 259,460 persons in 2025, down 0.2% from 2024.

That is the lowest reading since 2005.

Over the past ten years it has ranged from 259,460 persons (2025) to 269,912 persons (2015), averaging 264,457 persons.

Population (1 January) — Siena (NUTS-3 ITI19) (persons), 1990 – 2025. Source: Eurostat (Statistical Office of the European Union).

Showing the full history (downsampled for display). Open the interactive chart to zoom and switch transforms.

Recent data

Period	Value
2025	259,460 persons
2024	259,992 persons
2023	260,557 persons
2022	261,209 persons
2021	263,801 persons
2020	265,179 persons
2019	266,033 persons
2018	266,880 persons
2017	267,330 persons
2016	268,679 persons
2015	269,912 persons
2014	270,705 persons
2013	271,056 persons
2012	271,065 persons
2011	270,689 persons
2010	269,591 persons
2009	267,905 persons
2008	264,790 persons
2007	261,460 persons
2006	260,489 persons
2005	259,324 persons
2004	256,887 persons
2003	253,763 persons
2002	252,226 persons

Last 24 observations. The full history (28 observations) is available through the API.

Get Population (1 January) — Siena (NUTS-3 ITI19) in your code or spreadsheet

One guessable code, agency-direct, updated on release. Free tier available.

curl -H "X-API-Key: $MAKROGNOSIS_KEY" \
  "https://makrognosis.robomacro.com/v1/series/IT-I19.POP.A.NSA"

# Python
import requests
r = requests.get("https://makrognosis.robomacro.com/v1/series/IT-I19.POP.A.NSA",
                 headers={"X-API-Key": KEY})
obs = r.json()["observations"]

Get a free API key → · API docs

About this series

Latest observation	2025
First observation	1990
Observations	28
Frequency	Annual
Units	persons
Adjustment	Not seasonally adjusted
10-year high	269,912 persons (2015)
10-year low	259,460 persons (2025)
10-year average	264,457 persons
Source agency	Eurostat (Statistical Office of the European Union)
Makrognosis code	IT-I19.POP.A.NSA

This series is a labelled reference series (an official figure republished by an aggregator) rather than a first print from the agency itself.

Other Italy indicators

GDP — Siena (NUTS-3 ITI19)

National figure

Italy Population, 1 January

FAQ

Where does this data come from?: It is collected directly from Eurostat (Statistical Office of the European Union) and is available through the Makrognosis API under the code IT-I19.POP.A.NSA.

Last updated 2026-07-12. Source: Eurostat (Statistical Office of the European Union). Original title: “Population (1 January) — Siena (NUTS-3 ITI19)”.