Last official estimated population of Mercer County was 368,043 (year 2014)[1]. This was 0.115% of total US population and 4.1% of total New Jersey state population. Area of Mercer County is 228.9 mi² (=592.8 km²), in this year population density was 1,607.96 p/mi². If population growth rate would be same as in period 2010-2014 (+0.1%/yr), Mercer County population in 2026 would be 372,671 [0].
Historical population of Mercer County for period 1840-2014 [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
[1840-1850] +2.67 %/yr
[1850-1860] +2.95 %/yr
[1860-1870] +2.17 %/yr
[1870-1880] +2.27 %/yr
[1880-1890] +3.25 %/yr
[1890-1900] +1.78 %/yr
[1900-1910] +2.8 %/yr
[1910-1920] +2.44 %/yr
[1920-1930] +1.59 %/yr
[1930-1940] +0.53 %/yr
[1940-1950] +1.53 %/yr
[1950-1960] +1.49 %/yr
[1960-1970] +1.33 %/yr
[1970-1980] +0.13 %/yr
[1980-1990] +0.57 %/yr
[1990-2000] +0.74 %/yr
[2000-2005] +0.63 %/yr
[2005-2010] +0.25 %/yr
[2010-2014] +0.1 %/yr
Looking for settlements in Mercer County? Visit this page: Settlements in Mercer County, NJ
Population of Mercer County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 11050 | 10708 | 21,758 |
| 5 to 9 | 11388 | 10536 | 21,924 |
| 10 to 14 | 11802 | 11455 | 23,257 |
| 15 to 19 | 13561 | 13810 | 27,371 |
| 20 to 24 | 14616 | 14027 | 28,643 |
| 25 to 29 | 12175 | 11109 | 23,284 |
| 30 to 34 | 11920 | 11370 | 23,290 |
| 35 to 39 | 11761 | 11870 | 23,631 |
| 40 to 44 | 12748 | 12906 | 25,654 |
| 45 to 49 | 13170 | 13498 | 26,668 |
| 50 to 54 | 13660 | 14151 | 27,811 |
| 55 to 59 | 12496 | 13323 | 25,819 |
| 60 to 64 | 10015 | 11183 | 21,198 |
| 65 to 69 | 7675 | 8920 | 16,595 |
| 70 to 74 | 5152 | 6404 | 11,556 |
| 75 to 79 | 3575 | 4958 | 8,533 |
| 80 to 84 | 2635 | 3982 | 6,617 |
| 85+ | 2511 | 5417 | 7,928 |
Mercer 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 | 149118 | 160858 | 309,976 |
| WAC | 123565 | 126135 | 249,700 |
| WA | 120335 | 122844 | 243,179 |
| NHWAC | 95513 | 101731 | 197,244 |
| NHWA | 93087 | 99187 | 192,274 |
| BAC | 39316 | 43906 | 83,222 |
| BA | 37228 | 41675 | 78,903 |
| NHBAC | 35518 | 40257 | 75,775 |
| NHBA | 34056 | 38632 | 72,688 |
| H | 32792 | 28769 | 61,561 |
| HWAC | 28052 | 24404 | 52,456 |
| HWA | 27248 | 23657 | 50,905 |
| AAC | 20517 | 21448 | 41,965 |
| NHAAC | 20070 | 21011 | 41,081 |
| AA | 18823 | 19726 | 38,549 |
| NHAA | 18559 | 19452 | 38,011 |
| TOM | 3927 | 4085 | 8,012 |
| HBAC | 3798 | 3649 | 7,447 |
| NHTOM | 3012 | 3211 | 6,223 |
| HBA | 3172 | 3043 | 6,215 |
| IAC | 2145 | 1916 | 4,061 |
| IA | 1227 | 980 | 2,207 |
| HIAC | 1203 | 961 | 2,164 |
| NHIAC | 942 | 955 | 1,897 |
| HTOM | 915 | 874 | 1,789 |
| HIA | 912 | 695 | 1,607 |
| NAC | 655 | 647 | 1,302 |
| HAAC | 447 | 437 | 884 |
| NA | 370 | 317 | 687 |
| NHNAC | 320 | 363 | 683 |
| HNAC | 335 | 284 | 619 |
| NHIA | 315 | 285 | 600 |
| HAA | 264 | 274 | 538 |
| HNA | 281 | 226 | 507 |
| NHNA | 89 | 91 | 180 |
• Philadelphia County population
29.5 mi, 
230°
• Middlesex County
19 mi, 
55°
• Montgomery County
35.5 mi, 
261°
• Monmouth County
29.1 mi, 
89°
• Bucks County
21.6 mi, 
280°
• Union County
33.3 mi, 
38°
• Richmond County
35.4 mi, 56°
• Burlington County
28.2 mi, 
175°
• Somerset County
20 mi, 
12°
• Hunterdon County
22.4 mi, 
330°
[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
See note 1 New Jersey Notes
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