Data / Population density / Putnam County

Population density in Putnam County

Population density in Putnam County was 13.6 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is unchanged from 2024. That is the 67th highest of 102 counties in 2025.

2025, inhabitants per km²13.6
Change on 20240%
Rank67th of 102Counties in Illinois ranked
Series high13.62020
Series low13.42022

Population density in Putnam County, 2020 to 2025

CSVChart (SVG)

13.413.513.513.613.62020202120222023202420252020: 13.6 inhabitants per km²2021: 13.5 inhabitants per km²2022: 13.4 inhabitants per km²2023: 13.5 inhabitants per km²2024: 13.5 inhabitants per km²2025: 13.6 inhabitants per km²
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09, published 2026-03-26.
All 6 values
Periodinhabitants per km²
202513.6
202413.5
202313.5
202213.4
202113.5
202013.6

Compared with Illinois and United States

Place2025
Putnam County13.6
Illinois88.5
United States37.3

Rankings

Definition

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

How to cite

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

What is the latest population density in Putnam County? Cite the source.
get_value {"indicator":"population_density","place":"us-county-17155"}
GET https://invokely.ai/api/v1/value?indicator=population_density&place=us-county-17155

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

What is the population density in Putnam County?

Population density in Putnam County was 13.6 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is unchanged from 2024. That is the 67th highest of 102 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved by Invokely on 2026-10-09.

What was the highest population density in Putnam County?

13.6 inhabitants per km² in 2020, the highest value since 2020 in this series.

More statistics for Putnam County

All statistics for Putnam County