Demographics
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LaSalle
County
Ottawa
Streator
LaSalle
Peru
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1900
87,776
10,588
14,079
10,446
6,863
1910
90,132
9,535
14,253
11,537
7,984
1920
92,925
10,816
14,779
13,050
8,869
1930
97,695
15,094
14,728
13,149
9,121
1940
97,801
16,005
14,930
12,812
8,983
1950
100,610
16,957
16,469
12,083
8,653
1960
110,800
19,408
16,868
11,897
10,460
1970
111,409
18,716
15,600
10,736
11,772
1980
112,033
18,166
14,791
10,347
10,886
1990
106,913
17,451
14,121
9,717
9,302
2000
111,509
18,307
14,190
9,796
9,835
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Source: U.S. Census
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Table 1. Total population trends. Ottawa, Illinois and surrounding areas.

The population in Ottawa has been relatively unchanged since 1960 when the population was 19,408. By 2000, it dropped to 18,307. The lowest it has dropped since 1950 was in 1990 when the population was 17,451. This has been the trend for most of the surrounding communities. Census figures do not include residents of nearby unincorporated subdivisions.



 Graph 1. Total population trends. Ottawa, Illinois and surrounding areas.

 

Table 2. Age Distributions, Ottawa, Illinois
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Year
1970
1980
1990
2000
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Total Population
18,716
18,166
17,451
18,307
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0 – 4 Years
7.5%
1,399
6.5%
1,188
7.0%
1,222
6.4%
1,180
5 – 17 Years
26.8%
5,012
20.6%
3,745
17.0%
2,967
18.6%
3,396
18 – 24 Years
8.8%
1,656
12.7%
2,307
7.9%
1,379
8.1%
1,483
25 – 44 Years
22.0%
4,110
24.1%
4,377
29.7%
5,183
28.2%
5,163
45 – 64 Years
22.1%
4,140
22.0%
3,994
19.6%
3,420
20.8%
3,808
65 & Over
12.8%
2,399
15.9%
2,886
8.9%
3,298
17.9%
3,277
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Median Age
31.9
32.9
36.2
38.2
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Table 3. Median Age of Ottawa, Illinois and Surrounding Areas
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Illinois
LaSalle Cty
Ottawa
Streator
LaSalle
Peru
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1970
31.0
31.4
31.9
37.7
32.2
***
1980
29.9
32.2
32.9
33.9
35.0
34.4
1990
32.8
35.5
36.2
36.1
37.1
38.4
2000
34.7
38.1
38.2
38.1
38.1
40.9
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Table 4. Total Number of Housing Units for Ottawa, Illinois
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Year
Units
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1990
7,148
2000
8,030
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Table 5. Total Number of Households for Ottawa, Illinois and Surrounding Areas
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LaSalle Cty
Ottawa
Streator
LaSalle
Peru
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1990
41,284
7,148
5,665
4,201
3,787
2000
43,417
7,510
5,746
4,161
4,143
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