Most densely populated, US cities · 1990
US cities ranked by residents per square mile (1990). Union City, New Jersey leads at 45,075. 6,059 cities qualify in total. Cities with fewer than 5,000 residents are excluded. California carries 12 of the top 25 entries. The median across all 6,059 is 1,398.
Flip the list · Most sparsely populated, US cities →UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS
Frequently asked
Which city has the highest population density?
Union City, New Jersey ranks #1 with 45,075 (1990 Decennial Census).
What are the top 5 cities by population density?
Union City, New Jersey, Guttenberg, New Jersey, West New York, New Jersey, Isla Vista, California, Hoboken, New Jersey.
How many cities are in this ranking?
6,059 cities qualify after filtering for population minimums and data availability (minimum 5,000 residents). The ranking covers 1990 Decennial Census data.
How is population density measured?
Residents per square mile of land area. Source: US Census Bureau, 1990 Decennial Census.