Biggest U.S. Cities Founded After 1800

Most of the biggest American cities today were also historically prominent ones with already large populations prior to the nineteenth century. However, some are more recent, settled later on in history. Can you name the biggest cities of the United States today that were founded in or after the year 1800?

Not settled, founded

By city proper population according to 2024 U.S. Census Bureau estimates via citypopulation.de

Does not count when cities merge / split apart (e.g. just because Brooklyn merged with New York City in 1898 does not mean New York City was founded that year)

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Last updated: November 25, 2025

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First submitted	November 25, 2025
Times taken	27
Average score	70.0%
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Year Founded	City	Population
1837	Chicago	2.72M
1836	Houston	2.39M
1868	Phoenix	1.67M
1841	Dallas	1.33M
1822	Jacksonville	1.01M
1849	Fort Worth	1.01M
1839	Austin	0.99M
1821	Indianapolis	0.89M
1851	Seattle	0.78M
1859	Denver	0.73M
1889	Oklahoma City	0.71M
1905	Las Vegas	0.68M
1843	Portland	0.65M
1819	Memphis	0.61M
1846	Milwaukee	0.56M
1872	Fresno	0.55M
1848	Sacramento	0.54M
1837	Atlanta	0.52M
1878	Mesa	0.52M
1850	Kansas City	0.52M