Last official estimated population of San Jacinto County was 26,439 (year 2014)[1]. This was 0.008% of total US population and 0.1% of total Texas state population. Area of San Jacinto County is 627.9 mi² (=1626.3 km²), in this year population density was 42.11 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), San Jacinto County population in 2024 would be 26,577 [0].
Historical population of San Jacinto County for period 1880-2014 [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
[1880-1890] +1.75 %/yr
[1890-1900] +3.39 %/yr
[1900-1910] -0.74 %/yr
[1910-1920] +0.34 %/yr
[1920-1930] -0.16 %/yr
[1930-1940] -0.7 %/yr
[1940-1950] -2.31 %/yr
[1950-1960] -1.52 %/yr
[1960-1970] +0.86 %/yr
[1970-1980] +5.49 %/yr
[1980-1990] +3.66 %/yr
[1990-2000] +3.1 %/yr
[2000-2005] +2.41 %/yr
[2005-2010] +1.07 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in San Jacinto County? Visit this page: Settlements in San Jacinto County, TX
Population of San Jacinto County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 816 | 673 | 1,489 |
| 5 to 9 | 892 | 757 | 1,649 |
| 10 to 14 | 924 | 887 | 1,811 |
| 15 to 19 | 903 | 818 | 1,721 |
| 20 to 24 | 770 | 740 | 1,510 |
| 25 to 29 | 701 | 648 | 1,349 |
| 30 to 34 | 643 | 667 | 1,310 |
| 35 to 39 | 654 | 717 | 1,371 |
| 40 to 44 | 776 | 777 | 1,553 |
| 45 to 49 | 752 | 820 | 1,572 |
| 50 to 54 | 1030 | 1016 | 2,046 |
| 55 to 59 | 1140 | 1124 | 2,264 |
| 60 to 64 | 982 | 1062 | 2,044 |
| 65 to 69 | 928 | 915 | 1,843 |
| 70 to 74 | 752 | 728 | 1,480 |
| 75 to 79 | 482 | 509 | 991 |
| 80 to 84 | 321 | 320 | 641 |
| 85+ | 192 | 263 | 455 |
San Jacinto 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 |
| WAC | 12059 | 11792 | 23,851 |
| NH | 11898 | 11760 | 23,658 |
| WA | 11798 | 11560 | 23,358 |
| NHWAC | 10439 | 10238 | 20,677 |
| NHWA | 10232 | 10055 | 20,287 |
| H | 1760 | 1681 | 3,441 |
| HWAC | 1620 | 1554 | 3,174 |
| HWA | 1566 | 1505 | 3,071 |
| BAC | 1488 | 1530 | 3,018 |
| NHBAC | 1397 | 1442 | 2,839 |
| BA | 1370 | 1433 | 2,803 |
| NHBA | 1303 | 1363 | 2,666 |
| TOM | 277 | 248 | 525 |
| IAC | 269 | 239 | 508 |
| NHTOM | 220 | 195 | 415 |
| NHIAC | 176 | 161 | 337 |
| IA | 141 | 113 | 254 |
| AAC | 101 | 120 | 221 |
| NHAAC | 93 | 109 | 202 |
| HBAC | 91 | 88 | 179 |
| HIAC | 93 | 78 | 171 |
| AA | 66 | 82 | 148 |
| NHAA | 65 | 78 | 143 |
| NHIA | 73 | 65 | 138 |
| HBA | 67 | 70 | 137 |
| HIA | 68 | 48 | 116 |
| HTOM | 57 | 53 | 110 |
| NAC | 25 | 12 | 37 |
| NHNAC | 18 | 9 | 27 |
| HAAC | 8 | 11 | 19 |
| NA | 6 | 5 | 11 |
| HNAC | 7 | 3 | 10 |
| NHNA | 5 | 4 | 9 |
| HAA | 1 | 4 | 5 |
| HNA | 1 | 1 | 2 |
• Harris County population
51.4 mi, 
195°
• Montgomery County
27.3 mi, 
226°
• Liberty County
34.5 mi, 
146°
• Walker County
26.8 mi, 
295°
• Hardin County
48.9 mi, 
110°
• Polk County
24.2 mi, 
53°
• Grimes County
49.1 mi, 
267°
• Tyler County
48.7 mi, 
73°
• Trinity County
36.1 mi, 
1°
• Madison County
53 mi, 300°
[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
*Polk, Liberty, Walker, Montgomery Texas Notes
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