State of Connecticut Regional Analytics
-- Population & Components of Change; 2010-15
Components of Change: 7/1/2010-6/30/2015
The population of the State of Connecticut changed from 3,579,717 on 2010 to 3,590,886 in 2015 -- a change of 11,169 (0.31%). This report provides a summary of how and why the population has changed during this period and what these factors suggest about future change.| Natural Change | 35,489 |
| equals Births | 183,026 |
| less Deaths | 147,537 |
| Net Migration | -19,448 |
| equals net International Migration | 84,816 |
| plus net Domestic Migration | -104,264 |
Primary Contributing Factors to Change
The primary contributing factors resulting in population change are 1) natural change (births less deaths) and/or 2) net migration. Eight tables are presented below providing annual data for each component county of the state and state summary. The tables provide data on the total population, births, deaths, natural change (births less deaths), international migration, domestic migration and net migration.
From 2010 to 2015 (7/1/2010-6/30/2015), natural change (35,489) exceeded net migration (-19,448); natural change has been the primary contributing factor for the total state population change. Examine the state by county tables below to learn about how each county contributes to the state population growth or decline.
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Related Sections
• State of the States -- all states interactive table
• Metro S&O Reports -- all metros interactive table
• CountyTrends 2010-2015 -- all counties interactive table
• CountyTrends -- multi-sourced county data
• Regional Data Analytics Main
| Table 1. Population | ||||||||||
| Area Name | GeoID | Item | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | Chg 10-15 | %Chg 10-15 |
| Fairfield County, CT | 09001 | P0000001 | 919,744 | 929,013 | 935,238 | 941,793 | 945,816 | 948,053 | 28,309 | 3.08 |
| Hartford County, CT | 09003 | P0000001 | 895,303 | 896,928 | 897,149 | 897,926 | 896,871 | 895,841 | 538 | 0.06 |
| Litchfield County, CT | 09005 | P0000001 | 189,773 | 188,945 | 187,455 | 186,609 | 184,910 | 183,603 | -6,170 | -3.25 |
| Middlesex County, CT | 09007 | P0000001 | 165,628 | 166,198 | 165,508 | 165,301 | 164,757 | 164,063 | -1,565 | -0.94 |
| New Haven County, CT | 09009 | P0000001 | 863,401 | 863,977 | 863,921 | 862,515 | 861,238 | 859,470 | -3,931 | -0.46 |
| New London County, CT | 09011 | P0000001 | 274,067 | 273,211 | 274,394 | 273,716 | 272,743 | 271,863 | -2,204 | -0.80 |
| Tolland County, CT | 09013 | P0000001 | 153,208 | 153,069 | 151,934 | 151,722 | 151,597 | 151,420 | -1,788 | -1.17 |
| Windham County, CT | 09015 | P0000001 | 118,593 | 118,418 | 117,942 | 117,586 | 116,830 | 116,573 | -2,020 | -1.70 |
| Total | P0000001 | 3,579,717 | 3,589,759 | 3,593,541 | 3,597,168 | 3,594,762 | 3,590,886 | 11,169 | 0.31 | |
| Table 2. Births | ||||||||||
| Area Name | GeoID | Item | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | Sum11-15 | |
| Fairfield County, CT | 09001 | B0000001 | 10,876 | 10,407 | 10,195 | 10,047 | 10,040 | 10,078 | 50,767 | |
| Hartford County, CT | 09003 | B0000001 | 9,816 | 9,732 | 9,482 | 9,390 | 9,397 | 9,425 | 47,426 | |
| Litchfield County, CT | 09005 | B0000001 | 1,672 | 1,556 | 1,469 | 1,422 | 1,424 | 1,419 | 7,290 | |
| Middlesex County, CT | 09007 | B0000001 | 1,424 | 1,535 | 1,477 | 1,364 | 1,389 | 1,384 | 7,149 | |
| New Haven County, CT | 09009 | B0000001 | 9,036 | 9,266 | 9,046 | 8,912 | 8,965 | 8,968 | 45,157 | |
| New London County, CT | 09011 | B0000001 | 2,624 | 2,763 | 2,866 | 2,693 | 2,711 | 2,715 | 13,748 | |
| Tolland County, CT | 09013 | B0000001 | 1,348 | 1,183 | 1,125 | 1,125 | 1,139 | 1,104 | 5,676 | |
| Windham County, CT | 09015 | B0000001 | 1,160 | 1,194 | 1,189 | 1,181 | 1,117 | 1,132 | 5,813 | |
| Total | B0000001 | 37,956 | 37,636 | 36,849 | 36,134 | 36,182 | 36,225 | 183,026 | ||
| Table 3. Deaths | ||||||||||
| Area Name | GeoID | Item | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | Sum11-15 | |
| Fairfield County, CT | 09001 | D0000001 | 6,048 | 6,474 | 6,325 | 6,634 | 6,621 | 6,604 | 32,658 | |
| Hartford County, CT | 09003 | D0000001 | 7,268 | 7,928 | 7,748 | 7,864 | 7,870 | 7,945 | 39,355 | |
| Litchfield County, CT | 09005 | D0000001 | 1,488 | 1,670 | 1,753 | 1,823 | 1,792 | 1,728 | 8,766 | |
| Middlesex County, CT | 09007 | D0000001 | 1,380 | 1,458 | 1,428 | 1,490 | 1,449 | 1,413 | 7,238 | |
| New Haven County, CT | 09009 | D0000001 | 6,836 | 7,568 | 7,585 | 7,593 | 7,751 | 7,596 | 38,093 | |
| New London County, CT | 09011 | D0000001 | 2,184 | 2,232 | 2,331 | 2,395 | 2,338 | 2,387 | 11,683 | |
| Tolland County, CT | 09013 | D0000001 | 1,144 | 1,007 | 942 | 984 | 987 | 963 | 4,883 | |
| Windham County, CT | 09015 | D0000001 | 988 | 984 | 984 | 1,001 | 934 | 958 | 4,861 | |
| Total | D0000001 | 27,336 | 29,321 | 29,096 | 29,784 | 29,742 | 29,594 | 147,537 | ||
| Table 4. Natural Change | ||||||||||
| Area Name | GeoID | Item | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | Sum11-15 | |
| Fairfield County, CT | 09001 | NC000001 | 4,828 | 3,933 | 3,870 | 3,413 | 3,419 | 3,474 | 18,109 | |
| Hartford County, CT | 09003 | NC000001 | 2,548 | 1,804 | 1,734 | 1,526 | 1,527 | 1,480 | 8,071 | |
| Litchfield County, CT | 09005 | NC000001 | 184 | -114 | -284 | -401 | -368 | -309 | -1,476 | |
| Middlesex County, CT | 09007 | NC000001 | 44 | 77 | 49 | -126 | -60 | -29 | -89 | |
| New Haven County, CT | 09009 | NC000001 | 2,200 | 1,698 | 1,461 | 1,319 | 1,214 | 1,372 | 7,064 | |
| New London County, CT | 09011 | NC000001 | 440 | 531 | 535 | 298 | 373 | 328 | 2,065 | |
| Tolland County, CT | 09013 | NC000001 | 204 | 176 | 183 | 141 | 152 | 141 | 793 | |
| Windham County, CT | 09015 | NC000001 | 172 | 210 | 205 | 180 | 183 | 174 | 952 | |
| Total | NC000001 | 10,620 | 8,315 | 7,753 | 6,350 | 6,440 | 6,631 | 35,489 | ||
| Table 5. International Migration | ||||||||||
| Area Name | GeoID | Item | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | Sum11-15 | |
| Fairfield County, CT | 09001 | MI000001 | 4,904 | 5,868 | 5,330 | 5,788 | 6,678 | 6,673 | 30,337 | |
| Hartford County, CT | 09003 | MI000001 | 3,584 | 4,491 | 4,182 | 4,419 | 5,201 | 5,206 | 23,499 | |
| Litchfield County, CT | 09005 | MI000001 | 176 | 154 | 138 | 155 | 188 | 189 | 824 | |
| Middlesex County, CT | 09007 | MI000001 | 380 | 363 | 364 | 382 | 448 | 447 | 2,004 | |
| New Haven County, CT | 09009 | MI000001 | 2,736 | 3,598 | 3,320 | 3,493 | 4,141 | 4,142 | 18,694 | |
| New London County, CT | 09011 | MI000001 | 1,292 | 1,033 | 1,330 | 1,171 | 1,278 | 1,381 | 6,193 | |
| Tolland County, CT | 09013 | MI000001 | 276 | 327 | 318 | 341 | 401 | 399 | 1,786 | |
| Windham County, CT | 09015 | MI000001 | 168 | 297 | 265 | 256 | 329 | 332 | 1,479 | |
| Total | MI000001 | 13,516 | 16,131 | 15,247 | 16,005 | 18,664 | 18,769 | 84,816 | ||
| Table 6. Domestic Migration | ||||||||||
| Area Name | GeoID | Item | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | Sum11-15 | |
| Fairfield County, CT | 09001 | MD000001 | 1,944 | -211 | -2,825 | -1,943 | -6,261 | -6,994 | -18,234 | |
| Hartford County, CT | 09003 | MD000001 | -724 | -4,514 | -5,673 | -4,701 | -7,750 | -7,292 | -29,930 | |
| Litchfield County, CT | 09005 | MD000001 | -924 | -777 | -1,352 | -526 | -1,477 | -1,093 | -5,225 | |
| Middlesex County, CT | 09007 | MD000001 | -608 | 234 | -1,114 | -433 | -823 | -1,073 | -3,209 | |
| New Haven County, CT | 09009 | MD000001 | -924 | -4,526 | -4,820 | -5,872 | -6,526 | -7,257 | -29,001 | |
| New London County, CT | 09011 | MD000001 | -1,688 | -2,316 | -664 | -2,076 | -2,527 | -2,574 | -10,157 | |
| Tolland County, CT | 09013 | MD000001 | 1,532 | -584 | -1,672 | -650 | -587 | -567 | -4,060 | |
| Windham County, CT | 09015 | MD000001 | 300 | -657 | -956 | -806 | -1,260 | -769 | -4,448 | |
| Total | MD000001 | -1,092 | -13,351 | -19,076 | -17,007 | -27,211 | -27,619 | -104,264 | ||
| Table 7. Net Migration | ||||||||||
| Area Name | GeoID | Item | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | Sum11-15 | |
| Fairfield County, CT | 09001 | MN000001 | 6,848 | 5,657 | 2,505 | 3,845 | 417 | -321 | 12,103 | |
| Hartford County, CT | 09003 | MN000001 | 2,860 | -23 | -1,491 | -282 | -2,549 | -2,086 | -6,431 | |
| Litchfield County, CT | 09005 | MN000001 | -748 | -623 | -1,214 | -371 | -1,289 | -904 | -4,401 | |
| Middlesex County, CT | 09007 | MN000001 | -228 | 597 | -750 | -51 | -375 | -626 | -1,205 | |
| New Haven County, CT | 09009 | MN000001 | 1,812 | -928 | -1,500 | -2,379 | -2,385 | -3,115 | -10,307 | |
| New London County, CT | 09011 | MN000001 | -396 | -1,283 | 666 | -905 | -1,249 | -1,193 | -3,964 | |
| Tolland County, CT | 09013 | MN000001 | 1,808 | -257 | -1,354 | -309 | -186 | -168 | -2,274 | |
| Windham County, CT | 09015 | MN000001 | 468 | -360 | -691 | -550 | -931 | -437 | -2,969 | |
| Total | MN000001 | 12,424 | 2,780 | -3,829 | -1,002 | -8,547 | -8,850 | -19,448 | ||
| Table 8. Group Quarters | ||||||||||
| Area Name | GeoID | Item | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | Chg10-15 | %Chg 10-15 |
| Fairfield County, CT | 09001 | GQ000001 | 19,974 | 20,136 | 20,063 | 20,282 | 20,137 | 20,233 | 259 | 1.30 |
| Hartford County, CT | 09003 | GQ000001 | 29,055 | 28,522 | 27,492 | 27,620 | 27,131 | 26,881 | -2,174 | -7.48 |
| Litchfield County, CT | 09005 | GQ000001 | 2,804 | 2,783 | 2,727 | 2,682 | 2,685 | 2,693 | -111 | -3.96 |
| Middlesex County, CT | 09007 | GQ000001 | 5,099 | 5,173 | 5,058 | 4,922 | 4,856 | 4,823 | -276 | -5.41 |
| New Haven County, CT | 09009 | GQ000001 | 29,919 | 30,366 | 29,877 | 29,691 | 29,784 | 29,707 | -212 | -0.71 |
| New London County, CT | 09011 | GQ000001 | 12,798 | 12,052 | 12,508 | 12,575 | 12,204 | 12,059 | -739 | -5.77 |
| Tolland County, CT | 09013 | GQ000001 | 16,566 | 16,423 | 15,364 | 15,516 | 15,690 | 15,718 | -848 | -5.12 |
| Windham County, CT | 09015 | GQ000001 | 4,948 | 4,900 | 4,963 | 4,917 | 4,815 | 4,818 | -130 | -2.63 |
| Total | GQ000001 | 121,163 | 120,355 | 118,052 | 118,205 | 117,302 | 116,932 | -4,231 | -3.49 |
Source: developed by ProximityOne based on Census Bureau and other data.
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