Data / Population density / New Castle County

Population density in New Castle County

Population density in New Castle County was 532.5 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 0.3% from 2024.

2025, inhabitants per km²532.5
Change on 2024+0.3%
Series high532.52025
Series low517.12020

Population density in New Castle County, 2020 to 2025

CSVChart (SVG)

5155205255305352020202120222023202420252020: 517.1 inhabitants per km²2021: 518.1 inhabitants per km²2022: 521.6 inhabitants per km²2023: 526.2 inhabitants per km²2024: 530.7 inhabitants per km²2025: 532.5 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
2025532.5
2024530.7
2023526.2
2022521.6
2021518.1
2020517.1

Compared with Delaware and United States

Place2025
New Castle County532.5
Delaware210
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.

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What is the latest population density in New Castle County? Cite the source.
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Questions

What is the population density in New Castle County?

Population density in New Castle County was 532.5 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is up 0.3% from 2024.

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 New Castle County?

532.5 inhabitants per km² in 2025, the highest value since 2020 in this series.

More statistics for New Castle County

All statistics for New Castle County