Last official estimated population of Washington County was 127,100 (year 2014)[1]. This was 0.04% of total US population and 12% of total Rhode Island state population. Area of Washington County is 562.8 mi² (=1457.6 km²), in this year population density was 225.85 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Washington County population in 2024 would be 127,403 [0].
Historical population of Washington 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] -1.13 %/yr
[1800-1810] -0.75 %/yr
[1810-1820] +0.47 %/yr
[1820-1830] -0.18 %/yr
[1830-1840] -0.73 %/yr
[1840-1850] +1.38 %/yr
[1850-1860] +1.31 %/yr
[1860-1870] +0.71 %/yr
[1870-1880] +1.13 %/yr
[1880-1890] +0.5 %/yr
[1890-1900] +0.21 %/yr
[1900-1910] +0.32 %/yr
[1910-1920] -0 %/yr
[1920-1930] +1.64 %/yr
[1930-1940] +1.03 %/yr
[1940-1950] +4.1 %/yr
[1950-1960] +1.98 %/yr
[1960-1970] +3.54 %/yr
[1970-1980] +1.11 %/yr
[1980-1990] +1.66 %/yr
[1990-2000] +1.17 %/yr
[2000-2005] +0.62 %/yr
[2005-2010] -0.07 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, RI
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2408 | 2440 | 4,848 |
| 5 to 9 | 2962 | 3075 | 6,037 |
| 10 to 14 | 3668 | 3435 | 7,103 |
| 15 to 19 | 5519 | 5891 | 11,410 |
| 20 to 24 | 6318 | 6133 | 12,451 |
| 25 to 29 | 2780 | 2691 | 5,471 |
| 30 to 34 | 2781 | 2712 | 5,493 |
| 35 to 39 | 2768 | 2943 | 5,711 |
| 40 to 44 | 3307 | 3534 | 6,841 |
| 45 to 49 | 4171 | 4525 | 8,696 |
| 50 to 54 | 4979 | 5363 | 10,342 |
| 55 to 59 | 4960 | 5336 | 10,296 |
| 60 to 64 | 4437 | 4825 | 9,262 |
| 65 to 69 | 3833 | 3858 | 7,691 |
| 70 to 74 | 2516 | 2891 | 5,407 |
| 75 to 79 | 1554 | 1920 | 3,474 |
| 80 to 84 | 1102 | 1600 | 2,702 |
| 85+ | 1100 | 2318 | 3,418 |
Washington 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 | 59304 | 63556 | 122,860 |
| WAC | 58365 | 62381 | 120,746 |
| WA | 57321 | 61411 | 118,732 |
| NHWAC | 56762 | 60723 | 117,485 |
| NHWA | 55835 | 59856 | 115,691 |
| H | 1859 | 1934 | 3,793 |
| AAC | 1481 | 1855 | 3,336 |
| HWAC | 1603 | 1658 | 3,261 |
| NHAAC | 1427 | 1806 | 3,233 |
| HWA | 1486 | 1555 | 3,041 |
| BAC | 1538 | 1355 | 2,893 |
| AA | 1109 | 1502 | 2,611 |
| NHAA | 1093 | 1482 | 2,575 |
| NHBAC | 1329 | 1153 | 2,482 |
| TOM | 1173 | 1119 | 2,292 |
| IAC | 1010 | 1057 | 2,067 |
| NHTOM | 1034 | 997 | 2,031 |
| BA | 979 | 815 | 1,794 |
| NHIAC | 880 | 912 | 1,792 |
| NHBA | 846 | 692 | 1,538 |
| IA | 561 | 612 | 1,173 |
| NHIA | 483 | 512 | 995 |
| HBAC | 209 | 202 | 411 |
| HIAC | 130 | 145 | 275 |
| HTOM | 139 | 122 | 261 |
| HBA | 133 | 123 | 256 |
| HIA | 78 | 100 | 178 |
| NAC | 82 | 90 | 172 |
| NHNAC | 57 | 67 | 124 |
| HAAC | 54 | 49 | 103 |
| NA | 20 | 31 | 51 |
| HNAC | 25 | 23 | 48 |
| HAA | 16 | 20 | 36 |
| NHNA | 13 | 17 | 30 |
| HNA | 7 | 14 | 21 |
• Providence County population
32.5 mi, 
3°
• Bristol County
36.2 mi, 
48°
• New London County
25.9 mi, 
281°
• Kent County
18.6 mi, 
6°
• Middlesex County
47 mi, 
272°
• Tolland County
48.9 mi, 
310°
• Windham County
35.1 mi, 
326°
• Newport County
18.7 mi, 
67°
• Bristol County
26.8 mi, 
39°
• Dukes County
47.5 mi, 
91°
[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 Rhode Island Notes
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