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Most Populous Delaware Municipalities by Decade

Name the ten most populous municipalities in Delaware for every census since 1880.
City proper populations; incorporated places only.
Due to incomplete data, only municipalities that still exist today (in some form) are included.
Sources: Wikipedia and citypopulation.de
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Last updated: February 16, 2026
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First submittedFebruary 16, 2026
Times taken10
Average score41.2%
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Population
1880
42,478
Wilmington
3,700
New Castle
2,811
Dover
2,428
Smyrna
1,542
Seaford
1,280
Middletown
1,240
Milford
1,148
Newark
1,085
Delaware City
1,026
Milton
 
 
Population
1890
61,431
Wilmington
4,010
New Castle
3,061
Dover
2,555
Milford
2,455
Smyrna
2,388
Laurel
1,462
Seaford
1,454
Middletown
1,353
Georgetown
1,191
Newark
 
 
Population
1900
76,508
Wilmington
3,380
New Castle
3,329
Dover
2,500
Milford
2,259
Lewes
2,168
Smyrna
1,825
Laurel
1,724
Seaford
1,658
Georgetown
1,567
Middletown
 
 
Population
1910
87,411
Wilmington
3,720
Dover
3,351
New Castle
2,603
Milford
2,166
Laurel
2,158
Lewes
2,108
Seaford
1,913
Newark
1,843
Smyrna
1,609
Georgetown
Population
1920
110,168
Wilmington
4,042
Dover
3,834
New Castle
2,703
Milford
2,253
Laurel
2,183
Newark
2,141
Seaford
2,074
Lewes
1,953
Smyrna
1,710
Georgetown
 
 
Population
1930
106,597
Wilmington
4,800
Dover
4,131
New Castle
3,899
Newark
3,719
Milford
2,542
Laurel
2,468
Seaford
1,958
Smyrna
1,923
Lewes
1,812
Harrington
 
 
Population
1940
112,504
Wilmington
5,517
Dover
4,502
Newark
4,414
New Castle
4,214
Milford
2,884
Laurel
2,804
Seaford
2,593
Bellefonte
2,246
Lewes
2,113
Harrington
 
 
Population
1950
110,356
Wilmington
6,731
Newark
6,223
Dover
5,396
New Castle
5,314
Elsmere
5,179
Milford
3,087
Seaford
2,904
Lewes
2,700
Laurel
2,346
Smyrna
 
 
Population
1960
95,827
Wilmington
11,404
Newark
7,319
Elsmere
7,250
Dover
5,795
Milford
4,469
New Castle
4,430
Seaford
3,241
Smyrna
3,025
Lewes
2,709
Laurel
Population
1970
80,386
Wilmington
21,298
Newark
17,488
Dover
8,415
Elsmere
5,537
Seaford
5,314
Milford
4,814
New Castle
4,243
Smyrna
2,644
Middletown
2,563
Lewes
 
 
Population
1980
70,195
Wilmington
25,247
Newark
23,507
Dover
6,493
Elsmere
5,366
Milford
5,256
Seaford
4,907
New Castle
4,750
Smyrna
3,052
Laurel
2,946
Middletown
 
 
Population
1990
71,493
Wilmington
27,913
Dover
25,153
Newark
6,760
Milford
6,473
Smyrna
6,022
Seaford
5,906
Elsmere
5,698
New Castle
4,245
Middletown
4,104
Georgetown
 
 
Population
2000
72,561
Wilmington
32,269
Dover
29,360
Newark
7,487
Milford
7,073
Seaford
6,737
Middletown
6,695
Smyrna
5,903
Elsmere
4,952
New Castle
4,789
Georgetown
 
 
Population
2010
70,941
Wilmington
35,795
Dover
31,776
Newark
18,871
Middletown
10,047
Smyrna
9,586
Milford
6,892
Seaford
6,434
Georgetown
5,975
Elsmere
5,117
New Castle
 
 
Population
2020
70,889
Wilmington
39,498
Dover
30,621
Newark
23,201
Middletown
12,890
Smyrna
11,184
Milford
7,936
Seaford
7,150
Georgetown
6,899
Millsboro
6,233
Elsmere
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