Last official estimated population of Jefferson County was 742,227 (year 2014)[1]. This was 0.233% of total US population and 16.8% of total Kentucky state population. Area of Jefferson County is 397.7 mi² (=1030 km²), in this year population density was 1,866.38 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Jefferson County population in 2024 would be 745,062 [0].
Historical population of Jefferson County for period 1790-2014 [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
[1790-1800] +6.27 %/yr
[1800-1810] +4.35 %/yr
[1810-1820] +4.48 %/yr
[1820-1830] +1.45 %/yr
[1830-1840] +4.25 %/yr
[1840-1850] +5.11 %/yr
[1850-1860] +4.1 %/yr
[1860-1870] +2.9 %/yr
[1870-1880] +2.07 %/yr
[1880-1890] +2.59 %/yr
[1890-1900] +2.12 %/yr
[1900-1910] +1.24 %/yr
[1910-1920] +0.86 %/yr
[1920-1930] +2.18 %/yr
[1930-1940] +0.81 %/yr
[1940-1950] +2.32 %/yr
[1950-1960] +2.34 %/yr
[1960-1970] +1.3 %/yr
[1970-1980] -0.15 %/yr
[1980-1990] -0.29 %/yr
[1990-2000] +0.42 %/yr
[2000-2005] +0.46 %/yr
[2005-2010] +0.86 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Jefferson County? Visit this page: Settlements in Jefferson County, KY
Population of Jefferson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 25254 | 24035 | 49,289 |
| 5 to 9 | 24366 | 23177 | 47,543 |
| 10 to 14 | 23912 | 22960 | 46,872 |
| 15 to 19 | 23451 | 22258 | 45,709 |
| 20 to 24 | 24981 | 25311 | 50,292 |
| 25 to 29 | 27443 | 28421 | 55,864 |
| 30 to 34 | 26206 | 27371 | 53,577 |
| 35 to 39 | 23921 | 24282 | 48,203 |
| 40 to 44 | 23614 | 24705 | 48,319 |
| 45 to 49 | 23252 | 24445 | 47,697 |
| 50 to 54 | 26579 | 28608 | 55,187 |
| 55 to 59 | 25749 | 28430 | 54,179 |
| 60 to 64 | 21945 | 25059 | 47,004 |
| 65 to 69 | 16885 | 19614 | 36,499 |
| 70 to 74 | 10982 | 14110 | 25,092 |
| 75 to 79 | 7625 | 11005 | 18,630 |
| 80 to 84 | 5526 | 8851 | 14,377 |
| 85+ | 4970 | 10723 | 15,693 |
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 | 347303 | 376329 | 723,632 |
| WAC | 279378 | 294051 | 573,429 |
| WA | 271776 | 286152 | 557,928 |
| NHWAC | 262153 | 278947 | 541,100 |
| NHWA | 255139 | 271534 | 526,673 |
| BAC | 81592 | 93089 | 174,681 |
| NHBAC | 79590 | 91302 | 170,892 |
| BA | 76158 | 87387 | 163,545 |
| NHBA | 74529 | 85916 | 160,445 |
| H | 19358 | 17036 | 36,394 |
| HWAC | 17225 | 15104 | 32,329 |
| HWA | 16637 | 14618 | 31,255 |
| AAC | 11287 | 12020 | 23,307 |
| NHAAC | 11021 | 11768 | 22,789 |
| AA | 9288 | 9983 | 19,271 |
| NHAA | 9181 | 9865 | 19,046 |
| TOM | 8319 | 8691 | 17,010 |
| NHTOM | 7661 | 8143 | 15,804 |
| IAC | 2925 | 3236 | 6,161 |
| NHIAC | 2373 | 2743 | 5,116 |
| HBAC | 2002 | 1787 | 3,789 |
| HBA | 1629 | 1471 | 3,100 |
| IA | 892 | 923 | 1,815 |
| NHIA | 628 | 690 | 1,318 |
| HTOM | 658 | 548 | 1,206 |
| NAC | 557 | 574 | 1,131 |
| HIAC | 552 | 493 | 1,045 |
| NHNAC | 447 | 481 | 928 |
| HAAC | 266 | 252 | 518 |
| HIA | 264 | 233 | 497 |
| NA | 228 | 229 | 457 |
| NHNA | 165 | 181 | 346 |
| HAA | 107 | 118 | 225 |
| HNAC | 110 | 93 | 203 |
| HNA | 63 | 48 | 111 |
• Clark County population
20 mi, 
351°
• Floyd County
16.4 mi, 
302°
• Bullitt County
15.4 mi, 
189°
• Oldham County
18.2 mi, 
36°
• Nelson County
28.7 mi, 
158°
• Shelby County
23.6 mi, 
81°
• Harrison County
24.2 mi, 
269°
• Meade County
33.3 mi, 
242°
• Spencer County
21.7 mi, 
121°
• Trimble County
34.1 mi, 
29°
[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
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