Last official estimated population of Decatur city (Macon County**, Illinois state) was 74,010 (year 2014)[1]. This was 0.023% of total US population and 0.58% of total Illinois state population. Area of Decatur city is 47.0 mi² (=121.6 km²)[6], in this year population density was 1,576.16 p/mi². If population growth rate would be same as in period 2010-2014 (-0.7%/yr), Decatur city population in 2026 would be 68,019*.
Historical population of Decatur city for period 1860-2014:
Estimated population for 2014[1]. Click on flag to hide it.
Population • Legends • Position
[1860-1870] +6.43 %/yr
[1870-1880] +2.92 %/yr
[1880-1890] +5.84 %/yr
[1890-1900] +2.11 %/yr
[1900-1910] +4.14 %/yr
[1910-1920] +3.47 %/yr
[1920-1930] +2.76 %/yr
[1930-1940] +0.31 %/yr
[1940-1950] +1.12 %/yr
[1950-1960] +1.64 %/yr
[1960-1970] +0.16 %/yr
[1970-1980] +1.73 %/yr
[1980-1990] -0.96 %/yr
[1990-2000] -0.4 %/yr
[2000-2005] -1.02 %/yr
[2005-2010] -0.47 %/yr
[2010-2014] -0.7 %/yr
• Mount Zion village population
5.6 mi, 
152°
• Forsyth village
5.1 mi, 
341°
• Cerro Gordo village
10.8 mi, 
77°
• Harristown village
6.8 mi, 
262°
• Long Creek village
5.8 mi, 
127°
• Warrensburg village
8.6 mi, 
307°
• Macon city
10.5 mi, 
198°
• Argenta village
10.8 mi, 
34°
• Oreana village
6.5 mi, 31°
• Dalton City village
11.7 mi, 145°
*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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