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Most Populous US Counties by Decade (1990-2050)

Name the top 10 most populous US counties for each decade from 1990 to 2050, according to Ollie Bye.
Exact Video: "Top 50 U.S Counties by Population", Uploaded: May 13th, 2026
M stands for million(s)
Quiz by
DrewFan
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Last updated: May 13, 2026
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First submittedMay 13, 2026
Times taken10
Average score75.7%
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Year
Rank
Population
Answer
1990
1.
8.87 M
Los Angeles
 
2.
5.11 M
Cook
 
3.
2.83 M
Harris
 
4.
2.5 M
San Diego
 
5.
2.42 M
Orange
 
6.
2.3 M
Kings
 
7.
2.14 M
Maricopa
 
8.
2.11 M
Wayne
 
9.
1.96 M
Queens
 
10.
1.94 M
Miami-Dade
Year
Rank
Population
Answer
2000
1.
9.52 M
Los Angeles
 
2.
5.38 M
Cook
 
3.
3.4 M
Harris
 
4.
3.07 M
Maricopa
 
5.
2.85 M
Orange
 
6.
2.81 M
San Diego
 
7.
2.47 M
Kings
 
8.
2.25 M
Miami-Dade
 
9.
2.23 M
Queens
 
10.
2.22 M
Dallas
Year
Rank
Population
Answer
2010
1.
9.82 M
Los Angeles
 
2.
5.19 M
Cook
 
3.
4.09 M
Harris
 
4.
3.82 M
Maricopa
 
5.
3.1 M
San Diego
 
6.
3.01 M
Orange
 
7.
2.5 M
Kings
 
8.
2.5 M
Miami-Dade
 
9.
2.37 M
Dallas
 
10.
2.23 M
Queens
Year
Rank
Population
Answer
2020
1.
10.01 M
Los Angeles
 
2.
5.27 M
Cook
 
3.
4.73 M
Harris
 
4.
4.42 M
Maricopa
 
5.
3.3 M
San Diego
 
6.
3.19 M
Orange
 
7.
2.73 M
Kings
 
8.
2.7 M
Miami-Dade
 
9.
2.61 M
Dallas
 
10.
2.42 M
Riverside
Year
Rank
Population
Answer
2030
1.
9.43 M
Los Angeles
 
2.
5.28 M
Harris
 
3.
5.22 M
Cook
 
4.
4.86 M
Maricopa
 
5.
3.26 M
San Diego
 
6.
3.11 M
Orange
 
7.
2.75 M
Miami-Dade
 
8.
2.65 M
Dallas
 
9.
2.63 M
Kings
 
10.
2.62 M
Riverside
Year
Rank
Population
Answer
2040
1.
8.89 M
Los Angeles
 
2.
5.77 M
Harris
 
3.
5.28 M
Cook
 
4.
5.22 M
Maricopa
 
5.
3.2 M
San Diego
 
6.
3.02 M
Orange
 
7.
2.78 M
Riverside
 
8.
2.75 M
King
 
9.
2.73 M
Clark
 
10.
2.65 M
Miami-Dade
Year
Rank
Population
Answer
2050
1.
8.35 M
Los Angeles
 
2.
6.26 M
Harris
 
3.
5.57 M
Maricopa
 
4.
5.34 M
Cook
 
5.
3.15 M
San Diego
 
6.
3.02 M
King
 
7.
2.94 M
Clark
 
8.
2.94 M
Riverside
 
9.
2.94 M
Orange
 
10.
2.71 M
Tarrant
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Most Populous US Counties by Decade (1790-2050)
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