Due to a fire in the Commerce Department Building in January 1921, the 1890 Colorado Population Schedules were destroyed, as were the Special Schedules for Union Veterans and Widows.
1900
T623-121
Boulder County Population in 1900,
21,544
1910
T624-113
1920
T625-155 T625-156
1930
T626-230
T626-231
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