Last official estimated population of Jefferson County was 219,083 (year 2014)[1]. This was 0.069% of total US population and 3.6% of total Missouri state population. Area of Jefferson County is 664.3 mi² (=1720.5 km²), in this year population density was 329.80 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Jefferson County population in 2026 would be 220,136 [0].
Historical population of Jefferson County for period 1820-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1820-1830] +3.51 %/yr
[1830-1840] +5.18 %/yr
[1840-1850] +4.89 %/yr
[1850-1860] +4.09 %/yr
[1860-1870] +4.05 %/yr
[1870-1880] +1.99 %/yr
[1880-1890] +1.84 %/yr
[1890-1900] +1.35 %/yr
[1900-1910] +0.81 %/yr
[1910-1920] -0.49 %/yr
[1920-1930] +0.37 %/yr
[1930-1940] +1.51 %/yr
[1940-1950] +1.73 %/yr
[1950-1960] +5.73 %/yr
[1960-1970] +4.72 %/yr
[1970-1980] +3.34 %/yr
[1980-1990] +1.6 %/yr
[1990-2000] +1.47 %/yr
[2000-2005] +1.16 %/yr
[2005-2010] +0.8 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Jefferson County? Visit this page: Settlements in Jefferson County, MO
Population of Jefferson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 7141 | 6785 | 13,926 |
| 5 to 9 | 7791 | 7393 | 15,184 |
| 10 to 14 | 7733 | 7437 | 15,170 |
| 15 to 19 | 7142 | 6704 | 13,846 |
| 20 to 24 | 6662 | 6499 | 13,161 |
| 25 to 29 | 6868 | 6794 | 13,662 |
| 30 to 34 | 7475 | 7544 | 15,019 |
| 35 to 39 | 7308 | 7136 | 14,444 |
| 40 to 44 | 7318 | 7472 | 14,790 |
| 45 to 49 | 7568 | 7805 | 15,373 |
| 50 to 54 | 9122 | 9104 | 18,226 |
| 55 to 59 | 8349 | 8365 | 16,714 |
| 60 to 64 | 6575 | 6952 | 13,527 |
| 65 to 69 | 5196 | 5648 | 10,844 |
| 70 to 74 | 3633 | 4178 | 7,811 |
| 75 to 79 | 2250 | 2743 | 4,993 |
| 80 to 84 | 1367 | 1859 | 3,226 |
| 85+ | 983 | 1817 | 2,800 |
Jefferson County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 108404 | 110227 | 218,631 |
| WAC | 107984 | 109823 | 217,807 |
| WA | 106486 | 108285 | 214,771 |
| NHWAC | 106029 | 107963 | 213,992 |
| NHWA | 104630 | 106543 | 211,173 |
| H | 2077 | 2008 | 4,085 |
| HWAC | 1955 | 1860 | 3,815 |
| BAC | 1958 | 1712 | 3,670 |
| HWA | 1856 | 1742 | 3,598 |
| NHBAC | 1885 | 1624 | 3,509 |
| TOM | 1541 | 1587 | 3,128 |
| NHTOM | 1439 | 1460 | 2,899 |
| BA | 1386 | 1073 | 2,459 |
| NHBA | 1346 | 1030 | 2,376 |
| AAC | 1015 | 1252 | 2,267 |
| NHAAC | 989 | 1204 | 2,193 |
| IAC | 1041 | 1032 | 2,073 |
| NHIAC | 919 | 889 | 1,808 |
| AA | 639 | 880 | 1,519 |
| NHAA | 627 | 859 | 1,486 |
| IA | 390 | 377 | 767 |
| NHIA | 332 | 308 | 640 |
| HIAC | 122 | 143 | 265 |
| HTOM | 102 | 127 | 229 |
| NAC | 80 | 82 | 162 |
| HBAC | 73 | 88 | 161 |
| NHNAC | 63 | 67 | 130 |
| HIA | 58 | 69 | 127 |
| HBA | 40 | 43 | 83 |
| HAAC | 26 | 48 | 74 |
| NA | 39 | 33 | 72 |
| NHNA | 30 | 27 | 57 |
| HAA | 12 | 21 | 33 |
| HNAC | 17 | 15 | 32 |
| HNA | 9 | 6 | 15 |
• St. Louis County population
27 mi, 
11°
• St. Charles County
36.9 mi, 
348°
• St. Louis city
30.7 mi, 
31°
• St. Clair County
36.4 mi, 
66°
• Franklin County
30.5 mi, 
289°
• St. Francois County
31.1 mi, 
172°
• Randolph County
41.6 mi, 
109°
• Monroe County
19.8 mi, 
85°
• Washington County
29 mi, 
221°
• Ste. Genevieve County
33 mi, 
141°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*St. Louis, Ste. Genevieve Missouri Notes
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