Last official estimated population of Waterloo city (Monroe County**, Illinois state) was 10,178 (year 2014)[1]. This was 0.003% of total US population and 0.08% of total Illinois state population. Area of Waterloo city is 8.3 mi² (=21.4 km²)[6], in this year population density was 1,230.71 p/mi². If population growth rate would be same as in period 2010-2014 (+0.92%/yr), Waterloo city population in 2025 would be 11,260*.
Historical population of Waterloo city for period 1850-2014:
Estimated population for 2014[1]. Click on flag to hide it.
Population • Legends • Position
[1850-1860] +6.14 %/yr
[1860-1870] +0.69 %/yr
[1870-1880] +1.6 %/yr
[1880-1890] +0.32 %/yr
[1890-1900] +1.29 %/yr
[1900-1910] -0.11 %/yr
[1910-1920] -0.8 %/yr
[1920-1930] +1.5 %/yr
[1930-1940] +0.53 %/yr
[1940-1950] +1.8 %/yr
[1950-1960] +2.86 %/yr
[1960-1970] +1.97 %/yr
[1970-1980] +0.22 %/yr
[1980-1990] +1.39 %/yr
[1990-2000] +4.28 %/yr
[2000-2005] +2.49 %/yr
[2005-2010] +1.35 %/yr
[2010-2014] +0.92 %/yr
• Columbia city population
8.8 mi, 
337°
• Dupo village
12.6 mi, 343°
• Millstadt village
9 mi, 
24°
• Smithton village
10.2 mi, 
60°
• Red Bud city
12.3 mi, 
138°
• Valmeyer village
8.3 mi, 
252°
• Hecker village
8.9 mi, 
106°
• Kimmswick city
11.6 mi, 
278°
• Maeystown village
8.8 mi, 
208°
• Fults village
12.6 mi, 
194°
*Calculated by population.us from last known population growth rate, not official data.
**Some cities are placed on more than one county. Only 1 county is shown.
[1] Cities and Towns (Incorporated Places and Minor Civil Divisions) 2014, archived from the original, retrieved 02/23/2016
[2] City and Town Intercensal Estimates (2000-2010), archived from the original, retrieved 02/23/2016
[3] Places: 1990 and 1999 Populations, With Numeric and Percent Population Change, archived from the original, retrieved 02/23/2016
[4] Population of the 100 Largest Urban Places: 1980,
[5] Population of the 100 Largest Urban Places in history,
[6] Area, latitude longitude data, retrieved 02/23/2016
[7] Through the Decades, Overview 1790-2010, PDF, large files! >100 Mb
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