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Rural Land
Delaware County, IA
Population by Decades
Date
Population
Population
Change
Annual
% Change
1900
19,185
-
-
1910
17,888
-1,297
-0.7
1920
18,183
295
0.2
1930
18,122
-61
0.0
1940
18,487
365
0.2
1950
17,734
-753
-0.4
1960
18,483
749
0.4
1970
18,770
287
0.2
1980
18,933
163
0.1
1990
18,035
-898
-0.5
2000
18,404
369
0.2
Source:
U.S. Bureau of Census
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