New Jersey is America's densest state

New Jersey fits 1,270.6 people into every square mile. Alaska fits 1.3 people per square mile. New Jersey's density is roughly 985 times Alaska's.

Density is population divided by land area and it tells you whether a state's politics run on highways or subways, whether its housing is detached or stacked, and how far the average person lives from a hospital.

The District of Columbia is in a class of its own because it is a city, not a state. Among states, the top of the list is the Northeast corridor, unbroken from Maryland to Massachusetts, with one Southern exception: Florida, which is now denser than Pennsylvania.

The empty end

Alaska has 1.29 people per square mile, less than a quarter of Wyoming's 6.00. Montana follows at 7.67, North Dakota at 11.37, and South Dakota at 11.97. New Mexico is at 17.48, Idaho at 23.41, and Nebraska at 25.76.

Alaska's figure reflects an area larger than Texas, California, and Montana combined, holding fewer people than Fort Worth.

What has changed since 1990

Density moves slowly, since land area is fixed and only the numerator changes. Over 34 years the shifts still add up.

Nevada nearly tripled, and Utah roughly doubled, but both started so low that they are still emptier than the average Eastern state. Florida added 177 people per square mile, the largest absolute gain in the country, which is the arithmetic behind three decades of Florida development stories.

A state figure averages over everything inside it, including the empty parts, so it understates how most residents actually live. Nevada is thinly settled on paper while roughly three out of four Nevadans live in one metro area. For the places people actually crowd into, see the most densely populated cities in America and the most extreme census tracts. Population counts are at which state has the largest population, and the full list is at the most densely populated states.

Sources

Density is population divided by land area in square miles, excluding water. Population comes from the U.S. Census Bureau's 2020-2024 American Community Survey 5-year estimates for 2024 figures and the 1990 decennial census for the earlier ones; land area comes from the Census Bureau's TIGER files. Because land area excludes lakes, bays, and rivers, states with large water areas such as Michigan and Florida rank higher here than they would on total-area figures.