Last official estimated population of Washington County was 33,749 (year 2014)[1]. This was 0.011% of total US population and 0.1% of total Texas state population. Area of Washington County is 621.8 mi² (=1610.3 km²), in this year population density was 54.28 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Washington County population in 2026 would be 33,842 [0].
Historical population of Washington County for period 1850-2014 [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

[1850-1860] +9.78 %/yr
[1860-1870] +4.27 %/yr
[1870-1880] +1.78 %/yr
[1880-1890] +0.56 %/yr
[1890-1900] +1.22 %/yr
[1900-1910] -2.5 %/yr
[1910-1920] +0.41 %/yr
[1920-1930] -0.47 %/yr
[1930-1940] -0 %/yr
[1940-1950] -2.1 %/yr
[1950-1960] -0.7 %/yr
[1960-1970] -0.16 %/yr
[1970-1980] +1.56 %/yr
[1980-1990] +1.75 %/yr
[1990-2000] +1.52 %/yr
[2000-2005] +0.84 %/yr
[2005-2010] +1.24 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, TX
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1072 | 977 | 2,049 |
| 5 to 9 | 1052 | 1001 | 2,053 |
| 10 to 14 | 1146 | 946 | 2,092 |
| 15 to 19 | 1316 | 1395 | 2,711 |
| 20 to 24 | 1214 | 1117 | 2,331 |
| 25 to 29 | 938 | 867 | 1,805 |
| 30 to 34 | 855 | 935 | 1,790 |
| 35 to 39 | 871 | 858 | 1,729 |
| 40 to 44 | 956 | 929 | 1,885 |
| 45 to 49 | 963 | 997 | 1,960 |
| 50 to 54 | 1208 | 1205 | 2,413 |
| 55 to 59 | 1209 | 1253 | 2,462 |
| 60 to 64 | 1119 | 1232 | 2,351 |
| 65 to 69 | 983 | 999 | 1,982 |
| 70 to 74 | 752 | 821 | 1,573 |
| 75 to 79 | 544 | 672 | 1,216 |
| 80 to 84 | 399 | 540 | 939 |
| 85+ | 366 | 731 | 1,097 |
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 | 14247 | 15007 | 29,254 |
| WAC | 13546 | 13838 | 27,384 |
| WA | 13365 | 13673 | 27,038 |
| NHWAC | 11033 | 11565 | 22,598 |
| NHWA | 10890 | 11426 | 22,316 |
| BAC | 3150 | 3279 | 6,429 |
| BA | 3033 | 3179 | 6,212 |
| NHBAC | 3003 | 3146 | 6,149 |
| NHBA | 2912 | 3062 | 5,974 |
| H | 2716 | 2468 | 5,184 |
| HWAC | 2513 | 2273 | 4,786 |
| HWA | 2475 | 2247 | 4,722 |
| AAC | 317 | 376 | 693 |
| NHAAC | 284 | 347 | 631 |
| AA | 272 | 335 | 607 |
| NHAA | 246 | 310 | 556 |
| TOM | 208 | 183 | 391 |
| NHTOM | 166 | 156 | 322 |
| IAC | 151 | 154 | 305 |
| HBAC | 147 | 133 | 280 |
| HBA | 121 | 117 | 238 |
| NHIAC | 91 | 96 | 187 |
| IA | 77 | 99 | 176 |
| HIAC | 60 | 58 | 118 |
| HIA | 47 | 50 | 97 |
| NHIA | 30 | 49 | 79 |
| HTOM | 42 | 27 | 69 |
| HAAC | 33 | 29 | 62 |
| HAA | 26 | 25 | 51 |
| NAC | 17 | 16 | 33 |
| NHNAC | 11 | 12 | 23 |
| NA | 8 | 6 | 14 |
| HNAC | 6 | 4 | 10 |
| HNA | 5 | 2 | 7 |
| NHNA | 3 | 4 | 7 |
• Brazos County population
31.2 mi,
11°
• Bastrop County
54.4 mi,
261°
• Waller County
29.1 mi,
118°
• Austin County
23.8 mi,
159°
• Grimes County
33.9 mi,
47°
• Milam County
52.5 mi,
319°
• Fayette County
38.4 mi,
232°
• Colorado County
43.2 mi,
187°
• Burleson County
23 mi,
326°
• Lee County
34.6 mi,
282°
[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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