Last official estimated population of New Haven County was 863,367 (year 2014)[1]. This was 0.271% of total US population and 24% of total Connecticut state population. Area of New Haven County is 862.1 mi² (=2232.7 km²), in this year population density was 1,001.51 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), New Haven County population in 2026 would be 866,043 [0].
Historical population of New Haven 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] +0.42 %/yr
[1800-1810] +1.43 %/yr
[1810-1820] +0.67 %/yr
[1820-1830] +1.02 %/yr
[1830-1840] +1.03 %/yr
[1840-1850] +3.05 %/yr
[1850-1860] +4.03 %/yr
[1860-1870] +2.22 %/yr
[1870-1880] +2.59 %/yr
[1880-1890] +2.94 %/yr
[1890-1900] +2.56 %/yr
[1900-1910] +2.28 %/yr
[1910-1920] +2.1 %/yr
[1920-1930] +1.11 %/yr
[1930-1940] +0.44 %/yr
[1940-1950] +1.2 %/yr
[1950-1960] +1.92 %/yr
[1960-1970] +1.21 %/yr
[1970-1980] +0.22 %/yr
[1980-1990] +0.55 %/yr
[1990-2000] +0.24 %/yr
[2000-2005] +0.56 %/yr
[2005-2010] +0.36 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in New Haven County? Visit this page: Settlements in New Haven County, CT
Population of New Haven County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 23192 | 22331 | 45,523 |
| 5 to 9 | 25207 | 23959 | 49,166 |
| 10 to 14 | 26835 | 26126 | 52,961 |
| 15 to 19 | 30793 | 30100 | 60,893 |
| 20 to 24 | 30603 | 30120 | 60,723 |
| 25 to 29 | 28761 | 29370 | 58,131 |
| 30 to 34 | 26856 | 27994 | 54,850 |
| 35 to 39 | 24315 | 25732 | 50,047 |
| 40 to 44 | 26050 | 28092 | 54,142 |
| 45 to 49 | 29326 | 31277 | 60,603 |
| 50 to 54 | 31890 | 33776 | 65,666 |
| 55 to 59 | 30210 | 32390 | 62,600 |
| 60 to 64 | 24528 | 27263 | 51,791 |
| 65 to 69 | 19752 | 22873 | 42,625 |
| 70 to 74 | 13705 | 16869 | 30,574 |
| 75 to 79 | 9139 | 12048 | 21,187 |
| 80 to 84 | 6907 | 10486 | 17,393 |
| 85+ | 7204 | 15198 | 22,402 |
New Haven 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 | 343409 | 373138 | 716,547 |
| WAC | 336963 | 358799 | 695,762 |
| WA | 328968 | 350109 | 679,077 |
| NHWAC | 275430 | 296822 | 572,252 |
| NHWA | 269639 | 290481 | 560,120 |
| H | 71864 | 72866 | 144,730 |
| BAC | 63719 | 71053 | 134,772 |
| HWAC | 61533 | 61977 | 123,510 |
| BA | 57710 | 64326 | 122,036 |
| HWA | 59329 | 59628 | 118,957 |
| NHBAC | 53859 | 60479 | 114,338 |
| NHBA | 49713 | 55791 | 105,504 |
| AAC | 19094 | 21445 | 40,539 |
| NHAAC | 18375 | 20700 | 39,075 |
| AA | 16781 | 19011 | 35,792 |
| NHAA | 16396 | 18583 | 34,979 |
| HBAC | 9860 | 10574 | 20,434 |
| TOM | 9168 | 10033 | 19,201 |
| HBA | 7997 | 8535 | 16,532 |
| NHTOM | 6707 | 7383 | 14,090 |
| IAC | 4641 | 4833 | 9,474 |
| NHIAC | 2493 | 2683 | 5,176 |
| HTOM | 2461 | 2650 | 5,111 |
| IA | 2209 | 2090 | 4,299 |
| HIAC | 2148 | 2150 | 4,298 |
| HIA | 1424 | 1331 | 2,755 |
| NHIA | 785 | 759 | 1,544 |
| NAC | 771 | 771 | 1,542 |
| HAAC | 719 | 745 | 1,464 |
| NA | 437 | 435 | 872 |
| HAA | 385 | 428 | 813 |
| NHNAC | 405 | 396 | 801 |
| HNAC | 366 | 375 | 741 |
| HNA | 268 | 294 | 562 |
| NHNA | 169 | 141 | 310 |
• Suffolk County population
30.1 mi, 
158°
• Westchester County
46 mi, 
252°
• Fairfield County
25.7 mi, 250°
• Hartford County
32.7 mi, 
15°
• Dutchess County
51.7 mi, 
302°
• New London County
41.9 mi, 
78°
• Litchfield County
35.1 mi, 
330°
• Middlesex County
20.4 mi, 
73°
• Tolland County
45.5 mi, 
39°
• Putnam County
44.1 mi, 
277°
[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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