Last official estimated population of Monmouth County was 630,649 (year 2014)[1]. This was 0.198% of total US population and 7% of total New Jersey state population. Area of Monmouth County is 665.3 mi² (=1723.2 km²), in this year population density was 947.89 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Monmouth County population in 2026 would be 631,457 [0].
Historical population of Monmouth 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] +1.62 %/yr
[1800-1810] +1.09 %/yr
[1810-1820] +1.23 %/yr
[1820-1830] +1.56 %/yr
[1830-1840] +1.19 %/yr
[1840-1850] -0.82 %/yr
[1850-1860] +2.64 %/yr
[1860-1870] +1.62 %/yr
[1870-1880] +1.86 %/yr
[1880-1890] +2.21 %/yr
[1890-1900] +1.73 %/yr
[1900-1910] +1.45 %/yr
[1910-1920] +1.03 %/yr
[1920-1930] +3.44 %/yr
[1930-1940] +0.91 %/yr
[1940-1950] +3.4 %/yr
[1950-1960] +4.03 %/yr
[1960-1970] +3.23 %/yr
[1970-1980] +0.91 %/yr
[1980-1990] +0.95 %/yr
[1990-2000] +1.07 %/yr
[2000-2005] +0.41 %/yr
[2005-2010] +0.08 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Monmouth County? Visit this page: Settlements in Monmouth County, NJ
Population of Monmouth County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 16681 | 15956 | 32,637 |
| 5 to 9 | 18972 | 18439 | 37,411 |
| 10 to 14 | 21800 | 21062 | 42,862 |
| 15 to 19 | 22041 | 20961 | 43,002 |
| 20 to 24 | 19039 | 18225 | 37,264 |
| 25 to 29 | 17343 | 16298 | 33,641 |
| 30 to 34 | 16426 | 16540 | 32,966 |
| 35 to 39 | 16853 | 17631 | 34,484 |
| 40 to 44 | 20102 | 21380 | 41,482 |
| 45 to 49 | 23433 | 25419 | 48,852 |
| 50 to 54 | 26939 | 28336 | 55,275 |
| 55 to 59 | 24822 | 26119 | 50,941 |
| 60 to 64 | 19419 | 20664 | 40,083 |
| 65 to 69 | 15549 | 17121 | 32,670 |
| 70 to 74 | 10351 | 12258 | 22,609 |
| 75 to 79 | 6631 | 8846 | 15,477 |
| 80 to 84 | 4910 | 7736 | 12,646 |
| 85+ | 4780 | 10197 | 14,977 |
Monmouth 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 | 272420 | 290812 | 563,232 |
| WAC | 265004 | 277771 | 542,775 |
| WA | 260383 | 272923 | 533,306 |
| NHWAC | 234610 | 248669 | 483,279 |
| NHWA | 231035 | 245040 | 476,075 |
| H | 33671 | 32376 | 66,047 |
| HWAC | 30394 | 29102 | 59,496 |
| HWA | 29348 | 27883 | 57,231 |
| BAC | 25157 | 28604 | 53,761 |
| BA | 22610 | 25738 | 48,348 |
| NHBAC | 22340 | 25459 | 47,799 |
| NHBA | 20505 | 23488 | 43,993 |
| AAC | 18893 | 20131 | 39,024 |
| NHAAC | 18399 | 19612 | 38,011 |
| AA | 16692 | 17945 | 34,637 |
| NHAA | 16410 | 17669 | 34,079 |
| TOM | 5202 | 5533 | 10,735 |
| NHTOM | 4064 | 4180 | 8,244 |
| HBAC | 2817 | 3145 | 5,962 |
| IAC | 2307 | 2317 | 4,624 |
| HBA | 2105 | 2250 | 4,355 |
| NHIAC | 1190 | 1318 | 2,508 |
| HTOM | 1138 | 1353 | 2,491 |
| HIAC | 1117 | 999 | 2,116 |
| IA | 1046 | 886 | 1,932 |
| HIA | 733 | 538 | 1,271 |
| HAAC | 494 | 519 | 1,013 |
| NAC | 362 | 401 | 763 |
| NHIA | 313 | 348 | 661 |
| HAA | 282 | 276 | 558 |
| NHNAC | 246 | 281 | 527 |
| NA | 158 | 163 | 321 |
| HNAC | 116 | 120 | 236 |
| NHNA | 93 | 87 | 180 |
| HNA | 65 | 76 | 141 |
• Kings County population
26.3 mi, 
23°
• Queens County
30.5 mi, 
32°
• Middlesex County
17.1 mi, 
308°
• Essex County
34.9 mi, 
351°
• Hudson County
30.9 mi, 
7°
• Ocean County
29.7 mi, 
190°
• Union County
27 mi, 
342°
• Richmond County
19 mi, 
1°
• Mercer County
29.1 mi, 
269°
• Somerset County
31.2 mi, 308°
[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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