1880
|
35,629
|
Denver
|
14,820
|
Leadville
|
4,226
|
Colorado Springs
|
3,217
|
Pueblo
|
3,069
|
Boulder
|
2,730
|
Golden
|
2,141
|
Buena Vista
|
1,657
|
Breckenridge
|
1,501
|
Cañon City
|
1,356
|
Fort Collins
|
|
|
1930
|
287,861
|
Denver
|
50,096
|
Pueblo
|
33,237
|
Colorado Springs
|
12,203
|
Greeley
|
11,732
|
Trinidad
|
11,489
|
Fort Collins
|
11,223
|
Boulder
|
10,247
|
Grand Junction
|
7,980
|
Englewood
|
7,195
|
Sterling
|
|
|
1980
|
492,686
|
Denver
|
215,105
|
Colorado Springs
|
158,588
|
Aurora
|
113,808
|
Lakewood
|
101,686
|
Pueblo
|
84,576
|
Arvada
|
76,685
|
Boulder
|
65,092
|
Fort Collins
|
53,006
|
Greeley
|
50,211
|
Westminster
|
|
1890
|
106,713
|
Denver
|
24,558
|
Pueblo
|
11,140
|
Colorado Springs
|
10,384
|
Leadville
|
5,108
|
Aspen
|
3,330
|
Boulder
|
2,825
|
Cañon City
|
2,716
|
Durango
|
2,586
|
Salida
|
2,395
|
Greeley
|
|
|
1940
|
322,412
|
Denver
|
52,162
|
Pueblo
|
36,789
|
Colorado Springs
|
15,995
|
Greeley
|
13,223
|
Trinidad
|
12,958
|
Boulder
|
12,479
|
Grand Junction
|
12,251
|
Fort Collins
|
9,680
|
Englewood
|
7,411
|
Sterling
|
|
|
1990
|
467,610
|
Denver
|
281,140
|
Colorado Springs
|
222,103
|
Aurora
|
126,481
|
Lakewood
|
98,640
|
Pueblo
|
89,235
|
Arvada
|
87,758
|
Fort Collins
|
83,312
|
Boulder
|
74,625
|
Westminster
|
60,536
|
Greeley
|
|
1900
|
133,859
|
Denver
|
28,157
|
Pueblo
|
21,085
|
Colorado Springs
|
12,455
|
Leadville
|
10,147
|
Cripple Creek
|
6,150
|
Boulder
|
5,523
|
Trinidad
|
3,775
|
Cañon City
|
3,728
|
Florence
|
3,722
|
Salida
|
|
|
1950
|
415,765
|
Denver
|
63,685
|
Pueblo
|
45,472
|
Colorado Springs
|
20,354
|
Greeley
|
19,999
|
Boulder
|
16,869
|
Englewood
|
14,937
|
Fort Collins
|
14,504
|
Grand Junction
|
12,204
|
Trinidad
|
11,421
|
Aurora
|
|
|
2000
|
554,636
|
Denver
|
360,890
|
Colorado Springs
|
276,393
|
Aurora
|
144,126
|
Lakewood
|
118,652
|
Fort Collins
|
102,153
|
Arvada
|
102,121
|
Pueblo
|
100,940
|
Westminster
|
94,673
|
Boulder
|
82,384
|
Thornton
|
|
1910
|
213,381
|
Denver
|
41,747
|
Pueblo
|
29,078
|
Colorado Springs
|
10,204
|
Trinidad
|
9,359
|
Boulder
|
8,210
|
Fort Collins
|
8,179
|
Greeley
|
7,757
|
Grand Junction
|
7,508
|
Leadville
|
6,206
|
Cripple Creek
|
|
|
1960
|
493,887
|
Denver
|
91,181
|
Pueblo
|
70,194
|
Colorado Springs
|
48,458
|
Aurora
|
37,718
|
Boulder
|
33,398
|
Englewood
|
26,314
|
Greeley
|
25,027
|
Fort Collins
|
21,619
|
Wheat Ridge
|
19,338
|
Lakewood
|
|
|
2010
|
600,158
|
Denver
|
416,427
|
Colorado Springs
|
325,078
|
Aurora
|
143,986
|
Fort Collins
|
142,980
|
Lakewood
|
118,772
|
Thornton
|
106,595
|
Pueblo
|
106,433
|
Arvada
|
106,114
|
Westminster
|
100,377
|
Centennial
|
|
1920
|
256,491
|
Denver
|
43,050
|
Pueblo
|
30,105
|
Colorado Springs
|
11,006
|
Boulder
|
10,958
|
Greeley
|
10,906
|
Trinidad
|
8,755
|
Fort Collins
|
8,665
|
Grand Junction
|
6,415
|
Sterling
|
5,848
|
Longmont
|
|
|
1970
|
514,678
|
Denver
|
135,517
|
Colorado Springs
|
97,774
|
Pueblo
|
92,743
|
Lakewood
|
74,974
|
Aurora
|
66,870
|
Boulder
|
49,844
|
Arvada
|
43,337
|
Fort Collins
|
33,695
|
Englewood
|
30,902
|
Greeley
|
|
|
2020
|
715,524
|
Denver
|
479,021
|
Colorado Springs
|
386,325
|
Aurora
|
169,826
|
Fort Collins
|
155,973
|
Lakewood
|
141,863
|
Thornton
|
124,343
|
Arvada
|
116,601
|
Westminster
|
111,871
|
Pueblo
|
108,794
|
Centennial
|
|